고흥사무소 · 계획설계 검토

Goheung Office, Rev.1

Rev.0 has the right basic layout and I'd keep it: one gable roof over the office, the glass room and the service wing, 99.40 ㎡ in total. What needs work is inside the bays: which way people sit, where visitors go, how pipes and ducts cross the glass bay, and what heats the floor. Rev.1 makes ten changes and adds elevations, a steel frame with insulated panels, services sheets for water, heating, power and lighting, and a page for monitoring and controlling the office from a phone. The envelope, the bay widths and the total area stay the same.

연면적: 99.40 ㎡30.07평
태양광 데크: 7.74 kWp645 W × 12
배터리: 16 kWh한 줄 전원
변경: 10Rev.0 대비
결정할 것: 7A–G

Reviewed: 고흥사무소_계획안.pdf · Rev.0 · 2026.10.23
Checked against: 건축기준 memo, items 1–7
This revision: Rev.1 proposal · 2026.10.27
Unchanged: 14,200 × 7,000 · 박공 20° · 99.40 ㎡ (30.07평)
Sheets: A-101 · A-201 · A-301 · A-401 · A-501 · S-101 · S-201 · S-301 · M-101 · M-102 · E-201 · E-301 · L-101 · C-001 · C-101
Research: 조명 · 배터리 · 바닥재 (2026-10-27)
Appendix: Rev.1 sheet set, Rev.0 data, reference photos and all 12 PDF sheets

Rev.1

검토 · Review

What changes in Rev.1

Rev.0's layout stays. Ten changes deal with how people sit, where visitors go, how services cross the glass bay, how the building makes and stores power, and the solar deck. Seven decisions are yours.

Keep

What Rev.0 gets right

Three bays under one gable (7.1 / 3.8 / 3.3 m) meet every line of the memo: office 15.03평, service wing 6.99평, glass room in between.
The long sides face due south, so the whole south front gets sun all day. Rev.1 uses it for the solar deck (change 10).
The storage and mech-room doors open off the east gable. Deliveries and equipment checks never pass through the office.
The toilet opens off the lobby, so nobody has to walk through the office or the meeting room to reach it.
The materials follow your reference photos: grey standing-seam roof, red-brick gables, dark panel long walls.

A-1011층 평면도 · Floor plan

Switch between the two revisions to compare. Circles mark a problem in Rev.0 and triangles mark the matching change in Rev.1. The numbers match the list below. The solar deck (about 50 ㎡, open on three sides) isn't floor area and isn't in the totals.

Rev.1 change · Rev.0 problem
Lobby ceiling void used as the service bridge
Braced wall (typhoon bracing)
Ceiling-mounted unit (ERV, AC cassette)
Structural grid. Frames 3 and 4 bound the glass bay
Solar canopy over the deck, 12 modules, posts on grid line C

실 Room	Rev.0 ㎡	Rev.1 ㎡	평
사무실 Office	49.70	49.70	15.03
로비 Lobby	9.12	7.60	2.30
회의실 Meeting	17.48	19.00	5.75
화장실 Toilet	6.60	6.60	2.00
기계·전기실 Mech	6.60	6.60	2.00
창고 Storage	9.90	9.90	2.99
합계 Total	99.40	99.40	30.07

Rev.1

Ten changes

Office · 사무실

1

Turn the desks 90° to the window

In Rev.0 the north row looks straight into the south window and the south row has it behind them, so one row squints and the other gets glare on their screens. Rev.1 runs the 3 + 3 island north–south, so everyone sits side-on to the window. The director still faces the room and the door.
2

Close the west wall behind the director

Rev.0 puts a window right behind the director's chair. Staff see a silhouette, and the low afternoon sun lands on the desk. Rev.1 makes the west gable solid brick, like the reference photos, and daylight comes from the 5.2 m south window and the north high window. A solid gable also gives the frame a wall to brace in (change 9).
3

Meet visitors in the meeting room

Rev.0's sofa is in the far south-west corner, so every visitor walks past all seven desks to reach it. The meeting room is right off the lobby, so Rev.1 drops the sofa and puts a two-seat table by the window for one-to-ones and calls.

Glass bay · 유리 회의공간

4

Shorten the lobby and make the partition glass

The memo's central idea is an open passage through the middle (가운데는 통로처럼 비운다). Rev.0's 2.1 m furniture wall blocks the view from the front door to the garden. Rev.1 moves the partition from 2.4 m to 2.0 m, in line with the toilet wall, and builds it in glass with one solid 1.6 m panel: TV on the meeting side, company sign on the lobby side. The meeting room grows from 17.48 to 19.00 ㎡ and the lobby shrinks from 9.12 to 7.60 ㎡.
5

Use the lobby ceiling as a service bridge

The outdoor units and the mech room are at the east end. The AC, the ERV outlets and most of the PoE sensors are in the office at the west end. In Rev.0 the whole glass bay has an exposed sloped ceiling, so refrigerant pipes, ducts and cables have nowhere to hide on the way across. Rev.1 gives the lobby a flat 2,400 ceiling and runs everything above it. Stepping from the low lobby into the 4.3 m meeting room also makes the room feel taller.

Services and energy · 설비

6

Move the ERV out of the office ceiling

Rev.0 hangs the ERV in the office ceiling beside the director's desk, so its fan runs over the people working. Rev.1 puts it in the roof space above the mech room, where the filters are changed through a hatch. The meeting room gets its air from a grille in the lobby bulkhead.
7

Heat the floor with an air-to-water heat pump

Keep the hot-water floor heating and the buffer tank, but heat the water with a heat pump instead of an electric boiler. It uses about a third of the electricity. An electric boiler sized for this floor would take most of the hybrid inverter's capacity on its own, while the heat pump draws about 2 kW. The numbers are in the table below.
8

Panel, inverter and battery on one power line

Rev.0 puts the 16 kWh battery against the meeting-room wall, with the inverter on the far side of the room. Rev.1 puts the panel, hybrid inverter and battery together on the east side beside the exterior door, with louvers in the east wall, and runs the whole building on one power line: mains into the inverter, the inverter into one panel. In a power cut everything stays on from the battery and solar, and the hub switches off the AC, heat pump and water heaters so the inverter isn't overloaded. The DC cable is short, and the battery can be reached from outside if anything goes wrong.

Structure and sun · 구조 · 일사

9

Fix the frame lines before the structural review

Rev.0 doesn't set a structural grid. Rev.1 uses steel portal frames on lines 1–5 (0 · 3,550 · 7,100 · 10,900 · 14,200). Frames 3 and 4 are hidden in the walls on either side of the glass bay, so the meeting room has no columns and the curtain walls carry no roof load. Typhoon bracing goes only in solid walls: the west gable, the walls on lines 3 and 4, and the office's north wall. The roof deck carries the load across the glass bay. The walls and roof are insulated sandwich panels on this frame, drawn in the Structure part.
10

Move the solar panels off the roof onto a deck canopy

As you asked, the array comes off the roof (replacing memo item 6's roof array) and becomes the roof of a 3.6 m deep deck along the whole south front. Twelve modules (7.74 kWp) sit in one row on a steel canopy tilted 10°, with posts on grid lines 1–5. That gives about 9,800 kWh a year, a little more than the roof's 9,300, thanks to the 12th module. The canopy also does the job of Rev.0's eave: at noon it keeps the sun off the south glass from late January to late November, so no exterior screen is needed.

The cost is winter sun. At the December solstice the noon sun now reaches only about 0.3 m into the rooms instead of 3.4 m, which adds very roughly 500 kWh a year of heat-pump electricity. Use glass-glass modules rated for overhead use, have the structural engineer design the canopy for typhoon uplift, and ask the 건축사 how it counts: with open sides it shouldn't add floor area, but it will probably count toward building area (건축면적).

Also

Smaller fixes

Toilet boothsRev.0's booths are about 0.8 m wide inside. Thin cubicle partitions give 0.9 m each in the same 2.0 m. One larger all-gender room is still an option, and Rev.0 already asks you to choose.
West elevationA-201 shows only the south, north and east sides. Add the west. After change 2 it is a plain brick gable.
Air unitsA combined air purifier and dehumidifier (제습 공기청정기) and a winter humidifier stand against the office's east wall, and a dehumidifier stands in storage, pumping its water to the mech-room floor drain. The hub switches them by relay from the room sensors (rules 1, 2, 25 and 26). Choose models that restart by themselves after a power cut.
Canopy modulesUse glass-glass (bifacial) modules rated for overhead installation. They're safer over people than framed modules with a plastic backsheet, the gaps between them let some daylight through, and the back face picks up light reflected off the deck.
Office to deckThe deck now runs along the whole front. Add a glazed door in the office's south-east corner, where the wall is solid between 6.2 and 7.0 m, for a second exit and a direct way out to the deck.
Permit routeIn 관리지역 or 농림지역, 건축신고 covers buildings under 200 ㎡ (건축법 제14조 ①-2), so 99.40 ㎡ is only a hard limit in 도시지역. Check this once the 지번 is known.

Decisions

Your call

Heat pump or electric boiler? This decides changes 7 and 8 and the boiler line in the E-102 budget.
Which side does the road come from? Rev.1 still assumes a north entrance. Send the 지번 and the plan can be fitted to the lot.
Two toilet booths, or one larger room?
Storage door: a 1.6 m pair, or a 2.4 m overhead door for pallets?
Is there a public sewer at the lot? If not, M-101 puts the septic tank at the north-east corner, near the road for the pump-out truck.
Monitoring: Pico nodes plus the Raspberry Pi hub for the web app, as drawn in C-001, or Picos alone? Picos alone can show a page on the office Wi-Fi, but can't safely open the door from outside the office.
Battery: keep 16 kWh indoors as drawn, or go to 32 kWh in an outdoor cabinet? The battery research explains why 32 kWh can't go in the mech room.

건축 도면 · Architecture

Elevations, section, roof and view

The outside of the building in Rev.1, with the solar deck along the south front. The floor plan, A-101, is in the review above.

A-201입면도 · Rev.1 elevations

Rev.0's A-201 shows the panels on the roof and leaves out the west side. In Rev.1 the roof is plain standing seam, the solar canopy runs along the south front over the deck, and the west gable is solid brick (change 2). The east gable carries the meter, the louvres and motion-sensing lights over both service doors. Window heights are assumed (south sill 900, head 2,400; north high window sill 1,600) until a window schedule is drawn.

A-301단면도 A-A · Rev.1 · looking west through the glass bay

The lobby's flat ceiling hides the services crossing (5) and holds the meeting room's supply grille (6). Sun angles are for Goheung, 34.6° N, at noon, drawn through the outer edge of the solar canopy (10). From late January to late November the noon sun doesn't reach the south glass. At the December solstice it lights only the bottom 0.17 m and reaches about 0.3 m into the room. The canopy's outer edge is about 2.4 m above the deck.

A-401지붕 평면도 · 태양광 데크 캐노피 · Rev.1

The roof keeps its standing-seam finish with no panels and no fixings through it. The array moves to the canopy over the south deck: the same 645 W modules as Rev.0, plus one more, in a single row tilted 10° to the south. The flatter tilt loses a few percent a year, and the 12th module more than makes it up. The gaps between modules let some light and rain through. The rest of the rain runs off the low edge into a gutter and down the two end posts (M-101). The panels can be rinsed from the deck with a soft brush.

태양광 사양	Rev.1
모듈	645 W급 단결정, 2,382×1,134, 유리-유리 양면형
수량 · 용량	12장 · 1열 세로 · 7.74 kWp
배열	14,300 × 2,382 (평면 깊이 2,560)
방위 · 경사	정남 · 10° (캐노피)
구조	철골 캐노피, 기둥 격자선 1–5, 높은 쪽은 처마 골조에 지지
인버터	하이브리드 8–10 kW · 기계실 (E-301)
예상 발전량	연 약 9,800 kWh

A-501외관 (남동측 조감) · Rev.1

The same view as Rev.0's A-501, from the south-east, drawn a little lower so the façade shows under the canopy. The roof is plain grey standing seam. The solar canopy runs the length of the south front over a 3.6 m deck, on five slim posts, and the dark office wall and the meeting room's glass show beneath it. The east brick gable keeps the storage and mech-room doors.

구조 · Structure

Steel frame and insulated panels

The walls and roof are insulated sandwich panels, the cold-store kind (냉동 판넬), on a light steel frame: five portal frames on grid lines 1–5, purlins across the roof and girts along the walls. The solar canopy has its own steelwork off the south columns. Member sizes are starting values for the structural engineer.

S-101골조 평면 · Steel frame plan

Five portal frames on grid lines 1–5 carry the roof. Each column stands 260 mm inside the panel line, so the panels can wrap the frame in one piece. The glass bay has no columns: purlins span the 3.8 m between frames 3 and 4, and the curtain walls carry no roof load. The roof is braced in the two end bays, and the walls only where they are solid (change 9). The canopy hangs off the south columns on short outriggers, and its outer edge stands on five posts on grid line C.

부재 일람 · Members (starting sizes)
기호	부재	규격
C1	기둥 Column ×10	H-200×100×5.5×8
R1	보 Rafter ×5, 헌치	H-200×100×5.5×8
P1	중도리 Purlin @1,170	C-125×50×20×2.3
G1	띠장 Girt @1,500	C-100×50×20×2.3
ES	처마도리 Eave strut	C-150×65×20×2.3
BR	가새 Bracing	환봉 Ø12–16, X
BP	베이스 플레이트	PL-250×250×16, M20 ×4
CO	외팔 받침 Outrigger	H-150×75, 열교 차단 패드
CB · CR	캐노피 보 · 서까래	H-150×75
CP	캐노피 기둥 ×5	□-100×100×4.5

S-201골조 단면 · Typical frame, grid 2, looking east

A typical frame on grid 2, through the office. The wall panel's centreline sits on the grid line, with the girts and the column inside it. Measured to the wall centreline, the floor area stays 99.40 ㎡. The panels wrap the outside of the frame in one continuous layer, so the steel stays warm and dry inside it. Only the canopy outriggers pass through the wall, on thermal-break pads. At the posts there is about 2.25 m of headroom under the canopy beam.

S-301판넬 상세 · Panel details, about 1:10

① The wall panel stands on a steel angle at the slab edge, clear of the ground, with a drip flashing over the slab-edge insulation. ② The roof panel runs over the top of the wall panel onto the eave purlin. A flashing closes the gap, and the gutter sits inside the eave. ③ Wall panels lock together with a tongue and groove. The screw is hidden in the joint and goes into the girt, and the joint is sealed on the inside to keep the building airtight for the ERV.

판넬	사양 (계획)
외벽	125 mm, 준불연 심재 (PIR 또는 그라스울), 0.5 mm 컬러강판 양면, 1,000 폭 세로, 은폐 체결
지붕	150 mm, 같은 심재, 스탠딩심 외관, 중도리에 클립 고정
박공 (동·서)	판넬 앞에 치장벽돌, 공기층과 연결철물, 기초 받침
유리 회의공간	커튼월, 지붕 하중 없음
기초	기둥·캐노피 기둥 독립기초, 기초보, 슬래브 둘레 XPS 100

Panels on the gridKeep each wall panel's centreline on the grid line, with the girts and columns inside. The floor area then stays 99.40 ㎡, under the 100 ㎡ line. Hanging the panels outside columns that sit on the grid would push it to about 110 ㎡.
Fire-safe coreUse panels with a 준불연 (quasi-noncombustible) core, such as a rated PIR or glass wool, and no EPS foam. Korean rules on sandwich-panel cores have tightened since 2022; the 건축사 confirms what applies to this office.
Warm frameThe panels wrap the frame in one layer, so no steel bridges the insulation except the canopy outriggers, which sit on thermal-break pads.
Thickness125 mm walls and a 150 mm roof are starting points. The energy-saving design standard (에너지절약설계기준) check for the southern region sets the final thickness.
TyphoonThe structural engineer designs the canopy and the roof fixings for Goheung's coastal wind. Fixings get closer together near edges and corners, and the canopy posts get their own footings.
Brick gablesThe face brick on the east and west gables is a veneer in front of the panels, tied to the end-frame girts and standing on a ledge of the footing.

M·E·L

설비 · Services

Water, heating, power and lighting

Three sheets drawn over the Rev.1 plan. Pipes and cables cross the building on one route, through the toilet and lobby ceilings into the office ceiling. The water and refrigerant pipes run along one side and the cable tray about 400 mm away on the other.

Change 7

Heating: electric boiler or heat pump

Both heat the same floor loops with water at 30–35 °C. Heat pumps work best at low water temperatures like these.

	Electric boiler (Rev.0)	Air-to-water heat pump (Rev.1)
Power draw at the coldest hour	6–9 kW (typical boiler size for this floor)	about 2 kW
On the hybrid inverter and 16 kWh battery	Takes most or all of the inverter by itself, so in practice the heating runs off the grid	Fits, with room left for the AC and office loads
Electricity on a cold January day	about 30 kWh	about 10 kWh
Solar output on an average January day	about 18 kWh	about 18 kWh
Heating electricity per year	about 4,000 kWh	about 1,300 kWh
Share of the canopy's 9,800 kWh a year	about 41 %	about 13 %
In the mech room	Boiler and tank	Small indoor module and tank. The fan unit sits outside next to the AC unit
Purchase price	Lower	Higher. Get quotes for both

Rough figures for comparing the two options, not for sizing equipment. Assumes a heat loss of about 170 W/K for the Rev.0 envelope (외단열, low-E double glazing, ERV), a design low of −6 °C, a January mean of about 2 °C, heating on workdays with a night setback, a seasonal heat-pump COP of about 3, and solar yield scaled from A-401 (3.6 h/day over the year, about 2.6 h/day in January) to 12 modules at 10°. The canopy's loss of winter sun adds very roughly 500 kWh a year to either option.

M-101급수·배수 · Water and drainage

Cold water comes in from the road through a meter to a main valve under the toilet basin. From there it rises into the ceiling and runs to the WCs, the pantry, the heating fill and the yard tap. Each sink has its own 15 L heater, so no hot-water pipe crosses the building. Drains run under the slab inside and are buried outside, to an inspection chamber and then the public sewer, or a septic tank if there isn't one. Rainwater goes to separate catch pits.

급수 Cold water
급탕 Hot water, from an EWH 15 L heater under each sink
오수 Ø100 from the WCs
배수 Ø50 from the basin, sink and floor drains
AC condensate
RD downpipe to a catch pit, kept apart from the sewer

WM meter · MV main valve and pressure reducer · BF backflow preventer · FD floor drain · IC inspection chamber · ST septic tank · HB frost-free yard tap

기구 Fixture	급수	급탕	배수
수도 인입 Supply	Ø20	–	–
세면대 Basin	Ø15	Ø15	Ø50
대변기 WC ×2	Ø15	–	Ø100
바닥배수 FD ×2	–	–	Ø50
탕비 싱크 Pantry	Ø15	Ø15	Ø50
난방 보충수 Heating fill	Ø15	–	–
외부 수전 Yard tap	Ø15	–	–
AC 응축수 ×2	–	–	Ø25
선홈통 RD ×4	–	–	Ø100

The heat pump's indoor module heats the buffer tank, and the manifold sends water at 30–35 °C to six loops of Ø16 pipe at 200 mm centres. Every loop stays at or under about 90 m so they balance. The leaders run under the lobby floor, which warms the entrance. The four floor boxes are set out before the pipes go down, and the coil keeps 300 mm clear of them. Refrigerant pipes from both outdoor units run in the ceilings next to the water pipes.

Flow and return
Floor-heating loop, Ø16 @200
Refrigerant pipes, insulated, in the ceiling
Floor box, 300 mm clear of pipes

루프 Loop	구역 Area	㎡	배관
L1	사무실 창측 Office, window side	14.4	≈ 90 m
L2	사무실 중앙 Office, middle	14.5	≈ 85 m
L3	사무실 북측 Office, north	10.0	≈ 60 m
L4	회의실 Meeting	16.6	≈ 85 m
L5	로비 Lobby	6.1	≈ 35 m
L6	화장실 Toilet	3.7	≈ 20 m
합계		65.3	≈ 375 m

Manifold with 6 ports plus 1 spare. An actuator on each loop is switched by the hub from the room sensors. Throttle the short L5 and L6 loops at the manifold. Lengths include the leaders. No heating under fixed cabinets, in the mech room or in storage.

One cable tray runs from the panel through the toilet, lobby and office ceilings, with power and data in separate compartments. Every circuit comes off one panel fed by the hybrid inverter, so the battery and solar carry the whole building. In a power cut the hub switches off the heavy loads (C9–C14) so the inverter isn't overloaded. The desks and the meeting table get floor boxes, fed through conduits in the floor slab. 23 sockets, 4 floor boxes and 12 LAN outlets. Lighting (C1, C2) and the 10 PoE sensors from E-101 use the same tray and aren't drawn.

Double socket, with its circuit number (C1–C16)
Dedicated socket · waterproof socket on a 15 mA RCD
Floor box, fed through a conduit in the floor
Hard-wired: heaters, outdoor units, HP module, ERV
LAN outlet (number = count) · PoE device: AP, CAM, CP, DL
Circuit wiring, arrow toward the panel
Cable tray, data compartment dashed
Main line: meter → panel ↔ inverter (grid in, load out)
PV DC cable, from the canopy's east post underground

Socket heights: FL+300 generally · pantry counter FL+1,100 · basin FL+1,200 · behind the TV FL+1,000 · outdoors FL+600.

회로	Serves	Cable · breaker	Power cut
분전반 하나 · one panel, fed by the inverter (2P 50 A main)
C1	조명 Lighting, office	2.5 ㎟ · 16 A	On
C2	조명 Lighting, glass bay, service wing, deck, outdoor	2.5 ㎟ · 16 A	On
C3	Desks: FB2, FB3 (6 seats) · east wall ×3	2.5 ㎟ · 20 A RCD	On
C4	Director: FB1 · west wall ×2	2.5 ㎟ · 20 A RCD	On
C5	Lobby ×1 · meeting: FB4, TV, walls ×3	2.5 ㎟ · 20 A RCD	On
C6	Control box (hub, PoE switch, router, door locks) · mech socket	2.5 ㎟ · 20 A RCD	On
C7	Fridge, dedicated	2.5 ㎟ · 20 A RCD	On
C8	HP indoor module and pump · manifold actuators · ERV	2.5 ㎟ · 20 A	On
C9	AC outdoor unit (office cassette + meeting wall unit)	4 ㎟ · 30 A	Hub cuts
C10	Heat pump outdoor unit	4 ㎟ · 30 A	Hub cuts
C11	Toilet: heater, bidets ×2, basin socket	2.5 ㎟ · 20 A RCD 15 mA	Hub cuts
C12	Pantry counter ×2	2.5 ㎟ · 20 A RCD	Hub cuts
C13	Pantry water heater, hard-wired	2.5 ㎟ · 20 A RCD	Hub cuts
C14	Copier and plotter, dedicated	2.5 ㎟ · 20 A RCD	Hub cuts
C15	Storage ×2 · outdoor by the east door	2.5 ㎟ · 20 A RCD 15 mA	On
C16	Deck sockets ×2 under the canopy	2.5 ㎟ · 20 A RCD 15 mA	On
예비	4 spare ways

The lighting note's fittings, light levels and controls, laid out on the Rev.1 plan. In the office the three desk panels run east–west over each pair of facing desks, in line with where people look, so they stay out of the screens. The window row dims with daylight (DS). With the ERV gone from the office ceiling, the north corner gets a panel instead of two downlights. M1 hangs along the meeting table, and M2 is optional now that the furniture wall is gone. The lobby downlights sit in the flat 2,400 ceiling over the shoe benches. Outside, four lights go under the canopy and markers show the deck edge. Positions are ±0.3 m; ask the supplier for a DIALux check.

4000 K panel or batten (office, mech room, storage)
3000 K downlight or pendant · 2700 K outdoor light
LED strip (pantry, shoe benches, mirror, M2)
Emergency light · exit sign
Daylight sensor

ID	Fitting	Qty	Rev.1
L1	Office panel 1200×300, 4000 K	9	Desk panels east–west
L2	Cabinet downlights	0	Dropped, ERV moved
L3	Pantry under-cabinet strip	1
L4	Pendant, 3000 K	1	Over the 2-seat table
M1	Meeting linear pendant	1
M2	Up-light strip	0–1	Optional
B1	Lobby downlight, 3000 K	3	Recessed, flat ceiling
B2	Shoe-bench strip	2	Two benches
T1 · T2	Toilet downlight IP44 · mirror light	3 · 1
S1	IP65 batten	3	Mech 1, storage 2
EM · EXIT	Emergency light · exit sign	1 · 2	Fire designer confirms
E1	Entrance soffit · canopy underside	2 + 4	Under the canopy
E2 · E3	East door lights · path bollards	2 · 2+
E4	Deck edge marker	4	New deck edge

E-301단선결선도 · Single-line diagram

One power line. Mains comes through the meter and main breaker into the hybrid inverter, and the inverter feeds one panel for the whole building. The canopy array and the battery join at the inverter. In a power cut the inverter disconnects from the grid (anti-islanding) and keeps the whole building live; the hub cuts C9–C14 so the load stays within the inverter's rating. The bypass switch feeds the panel straight from the grid while the inverter is out for service. Choose an inverter whose grid pass-through is at least the 50 A main breaker, or a bigger inverter is needed.

What the services layout settles

Wet side, dry sideIn the mech room the heat pump, manifold, buffer tank and floor drain sit on the west side. The panel, inverter and battery are on the east side, so no pipe runs above the electrics.
Panel by the meterThe meter goes on the east gable beside the mech-room door, readable from outside. Rev.1 swaps the panel and the control box, and the battery and the inverter, so meter, panel and inverter line up along the east wall with short cables. The inverter, which runs warmer than the battery, now sits by the louvers.
Hot water at the sinkA 15 L heater under each sink, not a hot-water pipe from the mech room. The pantry is 7 m away; a long pipe would run cold for a minute every time and leave warm water standing in it.
Pantry drainGoes out through the north wall and along the outside to the inspection chamber, instead of under the heated glass-bay floor. One bend, with a cleanout chamber on it.
Meeting-room ACE-101 puts the wall unit on the west wall, where its pipes would have to cross the exposed sloped ceiling. Rev.1 puts it on the east wall, backing onto the mech room, so its pipes and drain go straight through the wall.
Floor boxesFour of them, under the director's desk, the desk island and the meeting table. Set them out and lay their conduits before the heating pipes go down.
One power lineMains, solar and battery meet in the hybrid inverter, which feeds the one panel. Nothing is split into backed-up and non-backed-up sections: the hub decides what to switch off in a power cut, through a contactor on each heavy circuit.
Solar cablesThe DC cables run down the canopy's east post and through an underground duct to the inverter, about 12 m. Nothing pierces the roof.
Wet and outdoorToilet, storage and outdoor sockets are on 15 mA RCDs (누전차단기) with waterproof covers. The yard tap is frost-free. An EV charger isn't drawn; it would need a 6 ㎟ circuit and a conduit to the parking space once the site plan exists.

모니터링 · Monitoring

Running the office from a phone

Six Pico boards around the building read the sensors and switch things on and off: lights, heating and cooling, the battery and inverter, the air units, the door and the water. Temperature probes watch the heating, the battery and the panels, humidity is measured in every room, and a rain gauge sits on the canopy. I've assumed the Raspberry Pi Pico 2 W. The Raspberry Pi hub already planned in E-102 sits in the middle. It runs the web app, keeps the history and applies the rules. The Picos only take orders from the hub, and your phone talks to the hub, never straight to a Pico.

C-001모니터링 계통도 · System diagram

Why there's a hub in the middle: a Pico 2 W can serve a simple page on the office Wi-Fi, but it doesn't have the memory for a secure, logged-in web app that's reachable from outside, and a door lock shouldn't be on the open internet. So the hub handles the web app, logins, history and rules, and the Picos handle the wiring. The door node (N1) and the power node (N4) are wired, so they keep working if the Wi-Fi drops. Everything runs off the battery-backed panel (C6), so it all stays up in a power cut.

C-101센서·제어 배치도 · Device plan

Where each node, sensor and switched device goes on the Rev.1 plan. This replaces the sensor layout in E-101. Room sensors go 1.2–1.5 m up on inside walls, away from windows, the AC and the air units, so they read the room and not the machine next to them. Solid lines are wired links, dotted lines are Wi-Fi, and thin lines show which node each device wires back to.

Pico node N1–N6 · hub
Sensor: TH temp/humidity · AQ CO₂/PM/VOC/humidity · PS presence · DS daylight · DC door contact · KP keypad · EX exit button · WM water meter
Switched: ST door strike · MV main valve · R relay (air units, outdoor lights) · KM shed contactors · FN fans (louvre, toilet extract)
Temperature probe: TP heating flow and return, buffer tank, battery, canopy panel · FT floor · FZ storage pipe
RN rain gauge on top of the canopy
Safety: WL water leak · SD fire detector contact (certified, read only)
MB Modbus link to the inverter, battery data and meter

Node	Where	Link
N1	Entrance and lobby: strike, door contact, exit button, keypad, presence, TH	Wired PoE
N2	Office: AQ, presence ×2, daylight, floor temp, pantry leak, air-unit relays	Wi-Fi
N3	Meeting room: AQ, presence, floor temp, deck door	Wi-Fi
N4	Control box: Modbus to the inverter, meter, AC, HP, ERV; shed contactors; fire contact; room temp and humidity; battery probe; fan	Wired PoE
N5	Mech room wall: leaks ×3, main valve, water meter; probes on the heating flow, return and buffer tank and the storage pipe; toilet humidity, extract fan and presence; storage TH and dehumidifier	Wi-Fi
N6	Deck, under the canopy: rain gauge, panel probe, outside TH, outdoor lights, office deck door	Wi-Fi, IP65 box

What it watches and switches

항목	How the Pico gets it	What it can switch	Alerts
조명 Lights	DALI-2 gateway indoors, N6 relays outside, presence and daylight sensors	On, off, dimming, scenes, outdoor schedule	Lamp or driver fault
온도 Temperature	TH and AQ sensors in every room and outside	AC and heat-pump set points (Modbus via N4)	Room out of range
온도 프로브 Probes	Waterproof DS18B20 probes: heating flow and return at the manifold, buffer tank, battery case, one canopy panel, two floors, the storage pipe	Heat-pump flow temperature, battery charge current	Flow over 40 °C, tank not heating, battery or panels hot, floor over 27 °C, pipe near freezing
배터리 Battery	BMS data read from the inverter over Modbus (N4)	Charge window, when to heat the buffer tank	Below 20 %, hot, BMS alarm
인버터 Inverter	Modbus (N4): solar, grid, load, fault codes	Work mode; tells the hub when the grid is lost	Fault, power cut, low output on a clear day
습도 Humidity	Every room's TH or AQ sensor, plus the toilet, storage, mech room and outside	Humidifier, dehumidifiers and the toilet extract fan through relays (N2, N5)	Room over 60 % or under 40 % for an hour, tank full, mech room outside the battery's range
공기청정 Air filter	PM2.5, VOC and CO₂ (AQ), run hours	Purifier speed, ERV boost	Filter due, PM2.5 high
출입 Entry	Door contact, who unlocked (app, card, keypad), presence, camera	Door strike (N1)	Door held open, entry in security mode
누수 Water	Leak sensors, meter pulses (N5)	Motorised main valve	Leak, water running at night
기계실 Mech room	Room temp, fire detector contact (N4)	Louvre fan	Over 35 °C, detector
강우 Rain	Tipping-bucket rain gauge on top of the canopy (N6), with outside humidity	Starts the storage dehumidifier early	Rain with a deck door open, heavy rain (check the gutters), a long dry spell with dirty panels
동파 Freeze	Probe on the storage pipe, outside temp	—	Pipe below 3 °C
전력 Power	Energy meter with CTs on every circuit	Shed contactors C9–C14	Unusual night load
시스템 System	Node heartbeats, internet	—	Node silent for 5 minutes

The web app

고흥사무소정상

근무 중 · 5명08:52 첫 출입 · 직원 A · 카드

배터리78%충전 +1.2 kW

태양광4.6 kW오늘 18.4 kWh

사무실23.4°52% · CO₂ 640

회의실22.8°비어 있음

비 감지 · 시간당 2 mm · 데크 문 닫힘

ERV 필터 교체까지 120시간

A clickable mockup with sample values. Try holding 열기 on the 출입 tab.

Opening the door from a phone

On the 출입 tab, hold the button for a second. Having to hold it stops a phone opening the door from inside a pocket.
The phone sends the request over HTTPS to the hub. It goes directly on the office Wi-Fi, or through the VPN from anywhere else.
The hub checks the person's account, door permission and time window (E-102), then tells N1 over MQTT to release the strike for 5 seconds.
N1's door contact confirms that the door opened and shut again. The hub logs who opened it and when, saves a camera snapshot and updates the app.

No open portsReach the office from outside only through a VPN (WireGuard or Tailscale). Never forward a router port to the hub or to a Pico.
One account eachEach person signs in with a passkey, and nobody shares a PIN. Delete an account and that person's access ends on every phone.
Works offlineThe keypad and card reader work through N1 even when the hub or the internet is down, and a mechanical key overrides everything.
Never locked inUse a fail-secure strike, which stays locked without power, on the battery-backed panel. The inside lever always opens the door. Ask the fire designer whether the door has to release on a fire alarm.
Knowing who's inDoor contact + who unlocked + presence sensors tell the hub when someone arrives and who it was. An entry with no unlock during security mode sounds an alarm.

Ground rules for the system

Safety stays separateFire detection, the battery emergency stop (KEC 512.1.4), emergency lights and exit signs are certified stand-alone devices. The Picos only read their outputs and send alerts. They never control them.
Fail safeIf a node stops, the shed contactors leave their circuits on, the DALI lights hold a fixed level, the main valve stays where it is, and the door stays locked but opens from inside.
Low voltage onlyThe Picos switch only low-voltage relay coils. Mains contactors and relays sit in the panel and are wired by the electrician.
Own networkThe Picos run on their own VLAN. MQTT uses a password per node and TLS, and firmware is updated only from inside the office network.
CameraThe camera covers the entrance only. Put up notice signs and get staff consent (개인정보보호법, E-102).

Rules 17–32, added to E-102's rules 1–9 and the lighting note's 10–16

#	When	The hub does
17	The inverter reports a power cut	Opens the shed contactors on C9–C14 and sends an alert. Five minutes after power returns, it brings them back one at a time.
18	Any leak sensor gets wet	Closes the motorised main valve and alerts everyone. Someone reopens it by hand in the app.
19	Water runs for 30 minutes at night or at a weekend	Alerts: probably a running WC or a leak
20	Mech room over 35 °C	Louvre fan on. Over 40 °C: alert, and lower the battery charge current.
21	Fire detector in the mech room trips	Alerts everyone and shows which doors are open. The certified detector and the emergency stop act on their own.
22	Door open for more than 2 minutes	Alert
23	Door opens in security mode without a valid unlock	Alarm, camera snapshot, alert
24	Someone opens the door from the app	Checks the user and time window, releases the strike for 5 s, confirms with the door contact, logs it
25	Storage humidity over 60 %	Storage dehumidifier on; off again at 50 %
26	Office PM2.5 over 25 µg/m³	Purifier to high. If outside PM is high too, cut the ERV's outdoor air.
27	Floor surface over 27 °C	Lowers the heat pump's flow temperature (flooring note)
28	A node goes silent for 5 minutes	Alert. That node's outputs go to their fail-safe state.
29	Rain starts while the deck slider or the office deck door is open	Alert on phones and the wall panel
30	Toilet humidity over 70 %	Extract fan on until it drops below 60 %, running at least 10 minutes
31	Heating flow over 40 °C, or the buffer tank not warming for 30 minutes in heating hours	Alert and lower the heat-pump set point (see rule 27)
32	No rain for 30 days and clear-day solar output down 10 %	Reminder to rinse the canopy panels from the deck

Parts list

Part	Qty	For
Raspberry Pi Pico 2 W	4	N2, N3, N5, N6 on Wi-Fi
WIZnet W5500-EVB-Pico with a PoE splitter	2	N1 and N4, wired
Raspberry Pi 5 with an SSD (the E-102 hub)	1	Web app, MQTT, history, rules
Sensirion SCD41 (CO₂ + temp/humidity) · SGP41 (VOC)	2 · 2	Office, meeting room
PM2.5 sensor (SPS30 or PMSA003I)	1	Office
SHT45 temp/humidity	6	Lobby, toilet, mech room, storage, outside, spare
mmWave presence sensor (LD2410 class)	7	Office ×2, meeting, lobby, toilet ×3
Reed door contacts · light sensor (BH1750 class)	5 · 1	Outside doors · daylight
Water leak sensors	4	Pantry, basin, WCs, mech room
Waterproof DS18B20 temperature probes	8	Heating flow and return, buffer tank, battery, canopy panel, floors ×2, storage pipe
Tipping-bucket rain gauge (reed output) · anemometer, optional	1 · 0–1	On top of the canopy, east end · typhoon wind alerts
12 V fail-secure electric strike, exit button, keypad/card reader	1 set	Main door
Motorised ball valve 20A · pulse water meter	1 · 1	Main supply (replaces MV)
RS485 transceiver (MAX3485) · Modbus energy meter with CTs	1 · 1	N4 · every circuit
AC, heat-pump and ERV interfaces (Modbus or contacts)	3	From each maker
2P contactors, wired to fail on · opto-isolated relay modules	6 · ~7	C9–C14 · air units, fans, outdoor lights
DALI-2 gateway · 12 V DC supply	1 · 1	Indoor lights · strike, valve, nodes

조사

조사 · Research

Lighting, battery and flooring notes

Three notes from the project folder, dated 2026-10-27, included in full. Each opens with how it fits Rev.1.

Research · 조명 Lighting

LED lighting plan: Goheung office (inside and outside)

고흥사무소_조명_조사.md · Research date: 2026-10-27 · Goes with: 고흥사무소_계획안.pdf (Rev.0), sheets A-101, A-301, A-602, E-101, E-102 · Related: 고흥사무소_바닥재_조사.md, 고흥사무소_배터리_조사.md

Fitting it to Rev.1

The note and its drawing use the Rev.0 plan and measure from the south-west corner with y running north. L-101 (the 조명 tab on the services drawings) lays the same fittings out on the Rev.1 plan, measured from the north-west corner with y running south, so a Rev.1 y is 7.0 minus the note's y.
Office: the desk panels now run east–west over each pair of facing desks, because Rev.1 turns the island 90° (change 1). The window row still dims with daylight. The ERV has left the office ceiling (change 6), so the corner by the document cabinets gets a panel instead of the two L2 downlights.
L4 hangs over the two-seat window table, since the sofa is gone (change 3).
Meeting room: M1 stays over the table. M2 is optional, because the 2,100 furniture wall it sat on is now glass and a full-height TV panel (change 4).
Lobby: B1 are recessed in the flat 2,400 ceiling (change 5) over the two shoe benches beside the door, and B2 runs under the benches.
Deck: four E1 lights go under the solar canopy and four E4 markers show the deck edge (change 10). The canopy itself stays unlit, as the note asks for the roof and array.
Circuits and controls: lighting is C1 and C2 in E-201. With one power line every light stays on in a power cut, so rule 15 (50 %, essential groups) is the hub's job. The presence and daylight sensors are in C-101, and the DALI-2 gateway sits with the hub.

The brief

Choose LED lighting for every room, and decide where each light goes, including outside the building.

LED lighting layout on the Rev.0 plan: office panels, meeting-room pendant, lobby and toilet downlights, service-room battens and shielded exterior lights

The drawing above is 고흥사무소_조명_배치도.svg. Positions are measured in metres from the building's south-west corner, on wall centrelines, and are accurate to about ±0.3 m at this stage.

The plan in short

Where	Lighting
Office	9 recessed linear LED panels in 3 rows, 4000 K, low glare (UGR < 19), about 500 lx on the desks. The row nearest the windows dims itself when there is daylight.
Meeting room	One long suspended pendant over the table that lights both down and up, plus a hidden LED strip on top of the furniture wall washing light up into the sloped wood ceiling. 3000–4000 K, high colour rendering (Ra ≥ 90) so faces look right on video calls.
Lobby	Warm 3000 K downlights: two over the shoes-off entry strip and one in the middle, plus a soft strip under the shoe cabinet. They turn on when someone walks in.
Toilets	Warm downlights and a mirror light, all rated for damp rooms (IP44), with presence sensors that won't switch off on someone sitting still
Boiler/electrical room, storage	Sealed IP65 LED battens, plus a battery-backed emergency light in the electrical room
Outside	A few warm (2700 K), fully shielded lights: at the front door, the deck, the two east service doors and along the path. No floodlights. Most go to motion-only after hours. The site sits among rice paddies, and night light measurably cuts rice yields.
Controls	Everything runs through the planned control hub: presence, daylight, a security mode after the last person leaves, and sunset/sunrise timing for the outside lights

Light levels

I used the European standard EN 12464-1 for the targets, because it is widely used, including by the free DIALux lighting calculations that suppliers run. The Korean standard is KS A 3011 (조도 기준, last confirmed 2023), but I couldn't get its tables. Ask the supplier to check the final design against KS A 3011.

Space	Target light level (on the task)	Colour temperature	Glare limit (UGR)	Colour rendering (Ra)
Office desks	500 lx (about 300 lx around them)	4000 K	< 19	≥ 80, 90 better
Meeting table	500 lx	3000–4000 K	< 19	≥ 90 (video calls)
Lobby / entrance	100–200 lx	3000 K	< 22	≥ 80
Toilets	200 lx, plus light on faces at the mirror	3000 K	< 25	≥ 90 at the mirror
Boiler/electrical room	200 lx	4000 K	< 25	≥ 80
Storage	100–200 lx	4000 K	< 25	≥ 60
Outside: front door	about 50 lx	2700 K	No light above horizontal	≥ 70
Outside: path, deck	about 5–20 lx	2700 K	No light above horizontal	≥ 70
Edge of any rice field	2 lx or less	—	—	—

The outdoor figures are design targets I chose, not taken from a standard. The rice-field limit comes from the crop research below.

Office check: 9 panels at about 4,500 lm plus 2 downlights at about 1,000 lm gives about 42,500 lm over about 47 m² of floor. After typical losses from room surfaces and dirt over time, that averages roughly 450–500 lx, and more over the desks, which have panels directly above them.

Interior fixtures

ID	Where	Fixture	Qty	Specification
L1	Office	Recessed linear LED panel, 1200×300. Korean ceilings are often built for 1280×320 panels instead, so match the ceiling grid.	9	40–45 W, about 4,500 lm (≥ 110 lm/W), 4000 K, Ra ≥ 80 (90 better), UGR < 19 (prismatic diffuser), flicker-free driver, DALI-2 dimmable
L2	Office, in front of the document cabinets	Recessed downlight, Ø100–150	2	10–12 W, about 1,000 lm, 4000 K, angled toward the cabinet fronts. This corner gets downlights, not a panel, because the ventilation unit (ERV) sits in the ceiling above it.
L3	Office pantry (탕비)	LED strip in an aluminium profile, under the wall cabinets	1 run, about 1.5 m	4000 K, Ra ≥ 90, its own switch at the counter
L4	Office reception corner (응접), optional	Decorative pendant over the low table	1	3000 K, about 800 lm, dimmable. Gives the corner a warmer feel.
M1	Meeting room	Suspended linear pendant lighting both down and up, about 2.2 m long, running north–south along the table	1	About 5,000–6,000 lm, about 60% down and 40% up, 3000–4000 K (tunable or fixed 3500 K), Ra ≥ 90, UGR < 19, DALI-2
M2	Meeting room, on top of the 2,100 mm furniture wall	LED strip pointing up	1 run, about 2.7 m	3000 K, 4–6 W/m, dimmable
B1	Lobby	Surface cylinder downlight fixed between the wood louvres	3	8–10 W, about 750 lm, 3000 K, Ra ≥ 90, deep anti-glare
B2	Lobby, under the shoe cabinet	LED strip at floor level	1 run, about 1 m	3000 K, low output, turned on by motion
T1	Toilets: wash area and 2 cubicles	Downlight, IP44	3	About 8 W, 3000 K
T2	Toilets, over the washbasin	Mirror light, IP44	1	3000–4000 K, Ra ≥ 90, lights faces from the front
S1	Boiler/electrical room (2), storage (2)	Sealed LED batten 1200 mm, IP65	4	25–30 W, about 3,000–3,500 lm, 4000 K
EM	Boiler/electrical room, by the east door	Battery-backed emergency light (비상조명등)	1	At least 1 hour. Lets someone work at the distribution board during a power cut.
EXIT	Main entrance, deck door	Exit sign (피난구유도등), LED with battery backup	2	Confirm number and positions with the fire-safety designer

Buy from Korean suppliers who show: KS certification (KS 인증) or the high-efficiency equipment certification (고효율에너지기자재 인증); a flicker-free driver (플리커 프리), since staff look at screens all day; and a 5-year warranty. Ask the supplier for a free DIALux calculation using the final ceiling plan.

Positions and the reasons for them

Office (7.1 × 7.0 m, flat 2,700 mm acoustic-tile ceiling)

Group	Positions (x, y) in m	Why it goes there
Window row: 3 × L1, running east–west	(1.3, 2.0), (3.5, 2.0), (5.7, 2.0)	Parallel to the 5.2 m south window band, so this row can dim when the sun is in and stay off most bright days. It stays clear of the air-conditioning cassette.
Desk island: 3 × L1, running north–south	(3.3, 3.4), (4.7, 3.4), (6.1, 3.4)	One panel centred over each pair of facing desks, crossing the partition. Staff face north and south, so running the panels the same way as their line of sight keeps panel reflections off their screens.
CEO desk: 1 × L1, running north–south	(1.4, 3.45)	Directly over the desk, in front of the person sitting there, not behind them, so it doesn't reflect in their screen
North row: 2 × L1, running east–west	(3.4, 5.6), (5.6, 5.6)	About 0.7 m in front of the copier, pantry and cabinets, so the cabinet fronts are lit. They stay at least 0.2 m from the Wi-Fi access point and presence sensor in E-101.
L2 × 2	(1.0, 6.0), (2.4, 6.0)	Light the document cabinets. The ERV (and its access hatch) takes up the ceiling just south of here.
L3	Under the pantry wall cabinets, x 4.9–6.4	Light on the counter
L4	(1.2, 1.35)	Over the reception table
DS daylight sensor (new)	(4.6, 2.0)	In the window zone, between two window-row panels, looking down at the desks. Add it to E-101.

Coordinate with E-101: the air-conditioning cassette, the ERV, the access point and the sensors all share this ceiling. Draw one reflected ceiling plan before the ceiling contractor sets out the grid.

Meeting room (3.8 × 4.6 m, sloped exposed ceiling from 3,000 to 4,274 mm)

M1 is centred over the table at (8.8, 2.0) and runs north–south, with its bottom about 2.1 m above the floor. At that height it stays out of the line of sight to the TV on the north furniture wall.
- The ceiling slopes from about 3.3 m to about 4.1 m along the table, so the two hanging cables will be about 1.2 m and 2.0 m long, keeping the light level.
- The upward light brightens the wood louvres, so the room isn't a dark box at night and faces on video calls aren't harshly shadowed.
M2 sits on top of the 2,100 mm oak furniture wall and shines up into the slope. It is visible from the lobby through the glass above the wall, so it ties the two spaces together in the evening.
Nothing is aimed at the TV.
Scenes: Meeting (M1 100%), Video call (M1 80% + M2 50%), Presentation (M1 30% + M2 20%), Off.
The room has glass on both the north and south sides, so after dark it glows to the outside and draws insects. The hub switches it off when the room is empty after hours.

Lobby and shoes-off entry (현관)

B1: two downlights over the shoes-off strip, either side of the front door at (8.2, 6.2) and (10.0, 6.2), and one in the middle of the lobby at (9.1, 5.25).
B2: a strip under the shoe cabinet so people can find their shoes without bright overhead light.
The lobby camera needs light on faces: B1 by the door and the outside soffit lights (E1) light faces from the front.
The lobby presence sensor already in the plan switches these lights; after hours they come on at a low level.

Toilets

T2: light faces from the front at the mirror, not only from above, which casts shadows.
T1: one downlight in the wash area at (11.6, 5.6), and one in each cubicle at (13.3, 6.5) and (13.3, 5.5).
Use presence sensors (microwave, mmWave or dual-technology) with a 10–15 minute hold. Ordinary PIR motion sensors switch the light off on someone sitting still in a cubicle.

Boiler/electrical room and storage

Boiler/electrical room: two IP65 battens running east–west at (11.8, 4.0) and (13.4, 4.0), over the walkway rather than behind equipment. Room lighting is also an electrical-code requirement for battery-storage spaces (KEC 511.1.1; see the battery research).
EM: the emergency light, by the east door.
Storage: two IP65 battens over the aisle at (11.8, 1.5) and (13.4, 1.5), not above the shelves, so the shelf contents aren't in shadow. IP65 matters because this room has a dehumidifier and damp air. Switch them by a door contact or motion sensor.

Outdoor lighting

Rules for this site

Protect the rice fields. Rice is a short-day plant: it starts forming grain when nights get long, so artificial light at night delays it.
- Field trial (Rural Development Administration crop research station, 2002): 10–20 lx at night delayed heading (grain formation) by 3–9 days and cut grain yield by 10–21% compared with 2 lx or less.
- Survey (Rural Development Administration, reported 2011): about 10 m from street lights (6–10 lx), rice yields were down about 16%.
- What this means here: keep light at any field edge at about 2 lx or less. Use full-cutoff fittings aimed at the building, no poles near field edges, and motion-only after hours from June to October, the growing season.
Use warm light to attract fewer insects. Studies find amber light (about 1800–2200 K) draws significantly fewer insects than 3000–4000 K, and warm white below 2700–3000 K is the usual recommendation. Use 2700 K everywhere outside, or 2200 K amber for anything facing the fields. Shielding and motion sensors cut insect attraction further.
Keep the night sky dark and avoid glare. Use no uplights, no lit brick gables, no floodlights, and keep mounting heights to about 2.4–3 m.
- Korea's light-pollution law (인공조명에 의한 빛공해 방지법) sets limits only in designated lighting-environment zones (조명환경관리구역, classes 1–4). Class 2 covers areas where too much light harms farming and plant growth.
- I couldn't confirm whether Goheung has designated zones. Ask the county. Either way, these fittings stay well inside the limits.
The site is coastal. Specify IP65 or better (IP67 for in-deck lights), marine-grade powder coat or 316 stainless steel, and typhoon-proof fixings.
Power during outages: put the outside lights on the battery-backed circuit. They draw only about 120 W in total, so they keep working for security when the grid is down.

Exterior fixtures and positions

ID	Where	Positions (x, y) in m	Fixture	Qty
E1	Soffit (underside of the 900 mm eave) over the main entrance, and over the meeting room's deck doors	North (8.6, 7.45), (9.6, 7.45); south (8.4, −0.45), (9.8, −0.45)	Recessed soffit downlight, IP65, 2700 K, 600–800 lm, recessed deep to cut glare	4
E2	East wall, above the storage double door and the boiler-room door, about 2.4 m up	(14.2, 1.25), (14.2, 3.95)	Wall downlight with flat glass, so no light goes above horizontal, IP65, 2700 K, about 800 lm, motion sensor	2
E3	Bollards either side of the north approach path, continuing every 4–5 m to the gate	(8.1, 9.0), (10.1, 9.0), …	Bollard 0.6–0.8 m tall with louvres aimed down, IP65, 2700 K (2200 K if near a field), 200–300 lm	2+ (depends on path length)
E4	Deck front edge	(7.9, −1.5), (9.0, −1.5), (10.1, −1.5)	Recessed deck marker, IP67, 2700 K, 30–50 lm, so the edge is visible without lighting the yard	3
E5	Yard or parking, optional	Once the site plan is known	Pole light 3–4 m with full cutoff and a back shield on the field side, 2700 K, brightens on motion. Only if parking needs it; keep it away from the field side.	0–2
—	Outdoor battery cabinet, if chosen (battery research option A)	At the cabinet	One E2-type motion light for access	0–1

Not lit, on purpose: the brick gables, the metal façades, the roof and the solar array. The entrance camera should have built-in infrared night vision, so no light has to stay on all night for it.

Outdoor control

Time	What happens
Sunset, using an astronomical clock in the hub for Goheung's sunset and sunrise times (more reliable than a light sensor that gets dirty)	E1 entrance and path lights on if anyone is still inside
Last person out (door lock set to security mode, 경비 모드)	E1 at 20% or off. E2, E3 and E5 go to motion-only: 100% for 3 minutes, then off.
23:00 to sunrise	Everything motion-only
June to October (rice season)	Lights facing the fields are motion-only all night, and the deck markers (E4) are off

Controls and the hub (adds to E-102)

Wiring: use DALI-2 for all dimmable indoor fittings. It is a two-wire control cable, cheap to run alongside the power cables during construction. A DALI gateway connects it to the Raspberry Pi hub. Zigbee drivers are a cheaper wireless fallback. Avoid Wi-Fi bulbs. Outside lights can run from simple relays.

Switch groups: - Office: G1 window row, G2 desks and CEO desk, G3 north row plus L2, with L3 and L4 on their own switches - Meeting room: scenes - Lobby and toilets: presence - Service rooms: door contact or motion

Put a scene keypad by each room door. A manual switch must always override the hub.

New hub rules (continuing the numbering in E-102):

#	When	What
10	Presence in the office	Lights on at the work scene. 15 minutes empty: dim to 20%. 30 minutes empty: off. (This matches rule 6.)
11	Daylight	The window row dims to keep 500 lx on the desks, and turns off when daylight is enough
12	First entry after dark (door lock)	Lobby and office route lights on (pairs with rule 5)
13	Last exit / security mode	All inside lights off, outside lights to after-hours mode
14	Sunset / sunrise / 23:00 / rice season	Outside schedule as in the table above
15	Running on battery during a power cut	Lighting limited to 50% and essential groups only. Emergency light and exit signs run on their own batteries.
16	Toilet presence	On. Off after 15 minutes with no one present.

Add to E-101: - 1 daylight sensor in the office window zone - Presence sensors in the toilet wash area and both cubicles - Motion sensors on the E2 east-wall lights and in storage - A DALI gateway in the control box

Power and energy

	Load
Inside, everything at 100%	About 0.7 kW. The office panels are about 380 W of that, about 8 W/m².
Outside, everything on	About 0.12 kW, plus up to about 60 W for optional pole lights
Typical day, with daylight dimming and presence control	About 3–4 kWh, a small part of the office's estimated 15–25 kWh per working day (see the battery research)

Still to confirm

Site plan: where the rice fields, road, gate and parking are. This fixes the E3 path bollards, E5 poles and which lights count as field-facing.
Ceiling grid from the ceiling contractor (1200×300 or 1280×320 panels), and one reflected ceiling plan combining E-101 and this layout
Office colour temperature: fixed 4000 K, or tunable white (costs more, DALI DT8 drivers)
Fire-safety designer: exit sign positions and any emergency-lighting requirement
Goheung county (고흥군): whether a lighting-environment zone (조명환경관리구역) applies at the site
Supplier: a DIALux calculation against the targets above and KS A 3011

Sources

KS A 3011 조도 기준 (Korean illuminance standard), standard listing: https://www.standard.go.kr/KSCI/standardIntro/getStandardSearchView.do?ksNo=KSA3011
EN 12464-1 values (offices and meeting rooms 500 lx, UGR 19, Ra 80; reception 300 lx): https://www.performanceinlighting.com/ww/en/en-12464-1
Ensto, guide to SFS-EN 12464-1:2011 (storage and technical rooms): https://www2.ensto.com/downloads/tools/lighting-guide/the-indoor-lighting-standard-sfs-en-12464-12011
김충국 외 (Rural Development Administration crop research station), effect of night lighting on rice heading and yield, 한국작물학회지 47(6), 2002: https://db.koreascholar.com/Article/Detail/13565
Seoul Shinmun, Rural Development Administration survey of crop damage near street lights (2011): https://m.go.seoul.co.kr/news/2011/01/19/20110119016017
Paulmann, insect-friendly outdoor lighting (summarises the WSL study and BUND recommendations): https://uk.paulmann.com/advice/outdoor-lighting/insect-friendly/
LED professional, Nichia 1800 K LEDs draw fewest insects (2026-04-28): https://www.led-professional.com/all/nichias-hps-color-leds-1800k-show-reduced-insect-attraction-in-joint-research
Smithsonian, amber light and insects (with caveats): https://www.smithsonianmag.com/smithsonian-institution/amber-light-could-save-bugs-rainforestand-your-backyard-too-180977495/
Seoul, lighting-environment zones 1–4 and the vertical light limit at homes (주거지 연직면 조도): https://news.seoul.go.kr/citybuild/?p=43888
Gyeonggi province, guideline for outdoor lighting outside the light-pollution law (no stray light, light trespass or glare): https://www.gg.go.kr/uploads/CONTENTS/site/gg/참고2빛공해방지법-미적용-조명기구-설치.관리-가이드라인_인쇄.pdf
KEC 511.1.1, lighting in battery-storage spaces (see 고흥사무소_배터리_조사.md): https://cq4l.com/kec510%EC%A0%84%EA%B8%B0%EC%A0%80%EC%9E%A5%EC%9E%A5%EC%B9%98/

Research · 배터리 Battery

Battery bank research: Goheung office (32 kWh LiFePO4)

고흥사무소_배터리_조사.md · Research date: 2026-10-27 · Goes with: 고흥사무소_계획안.pdf (Rev.0), sheets A-101, A-601, E-101, E-102

Fitting it to Rev.1

E-201 and E-301 draw the plan's 16 kWh battery indoors, which is the note's option C, on one power line: mains into the hybrid inverter, the inverter into one panel for the whole building. The Rev.1 mech room already follows the note's indoor rules: the battery sits on the dry east side, away from the heat pump, buffer tank and manifold, with no pipe above it.
For 32 kWh (option A) the battery goes in an outdoor cabinet. On Rev.1 the north-east corner already holds the outdoor units, the KEPCO feed and the possible septic tank, the east wall has both service doors, and the south front is now the solar deck, so the cabinet needs a place on the site plan at least 1.5 m from the building, the deck canopy and other structures, and 3 m from any door. The inverter can stay by the panel or move into the cabinet; in E-301 only the battery branch changes.
Solar: the array is now 12 modules (7.74 kWp) on the deck canopy, making about 9,800 kWh a year, against the note's 9,300.
Either option: add the emergency-stop button outside the mech-room east door, next to the meter (KEC 512.1.4).
Backup time: E-301's "about 6 hours" assumes working-day loads of about 2.3 kW once the hub has cut the heavy circuits. The note's 16–32 hours assumes 0.5–1 kW of essentials. Both are right for their loads; having the hub trim further toward the note's list makes the battery last longer.
Heating: the note's winter figure of 20–40 kWh a day is for the electric boiler. With Rev.1's heat pump it is about 10 kWh on a cold day (change 7), which leaves more of the battery for everything else.

The brief

Put a bank of LiFePO4 (lithium iron phosphate, LFP) batteries totalling 32 kWh next to the inverter(s), storing power from the 7.10 kWp rooftop solar array.

I have read "32kw" as 32 kWh of stored energy, the same way the plan read the earlier note "16kw" as 16 kWh. (kWh is how much energy the batteries hold; kW is how fast power flows in or out.)

What the plan says now: one 16 kWh battery in the boiler/electrical room (보일러·전기실, 3.3 × 2.0 m = 6.6 m²). The same room holds the electric hot-water boiler, the floor-heating manifold, the heat storage tank, the distribution board, the hybrid inverter and the control box. The budget line is US$1,700 including shipping.

The key finding: 32 kWh crosses Korea's 20 kWh line

Korean rules treat lithium battery storage above 20 kWh as a regulated energy storage facility. A 16 kWh bank is under that line. A 32 kWh bank is over it, and two sets of rules apply:

	Up to 20 kWh	Over 20 kWh (32 kWh is here)
Electrical code (KEC, 한국전기설비규정)	General ESS rules (KEC 511): ventilation, keeping to the maker's temperature and humidity range, protection from flooding and leaks, DC-rated protection	Detailed lithium ESS rules (KEC 512.1). Inside a building that visitors use (512.1.6): the battery room must be fire-resistant construction (내화구조); at most 50 kWh per rack; clearances from rack to wall of 1 m at the front and 0.8 m at the sides and back; not on a roof; gas venting; automatic emergency stop within 5 seconds
Fire code (소방시설법 시행령 별표2, NFTC 607)	Not a specially regulated fire facility	Becomes a regulated fire facility (특정소방대상물, 전기저장시설), whether it sits in a building, a container or an enclosure. Required: fire extinguishers, sprinklers, automatic fire detection, and automatic alarm transmission to 119 (자동화재속보설비). Sprinklers must deliver 12.2 L/min per m² for 30 minutes, and the battery room must be fire-separated (방화구획) from the rest of the building. An outdoor installation may use a battery fire-suppression unit (배터리용 소화장치) instead of sprinklers.
Product certification	KC 62619 safety confirmation (안전확인) applies at either size	Same

Why 32 kWh will not fit in the planned room

The boiler/electrical room is about 1.8 m deep inside. Under KEC 512.1.6, one battery rack needs 1 m clear in front plus the rack itself (about 0.3 m) plus 0.8 m behind, which is about 2.1 m before anything else goes in. The boiler, heat storage tank and manifold are in the same room. Also, the battery room would need to be fire-separated and have sprinklers, and this rural site may have no water supply that can run them. A sprinkler for this room would need roughly 6.6 m² × 12.2 L/min × 30 min ≈ 2.4 tonnes of water, with a tank and pump.

You can't make a new indoor battery room either. The plan keeps the building at 99.40 m² on purpose: under 100 m², it only needs a building report (건축신고) rather than a full building permit (A-601). An extra room would push it over.

Three ways forward

	A. 32 kWh in an outdoor battery cabinet	B. 32 kWh in an indoor battery room	C. Keep it at 20 kWh or less, indoors
What it is	A weatherproof ESS cabinet (옥외형) on a raised base outside the service block. The hybrid inverter stays in the boiler/electrical room, or goes in the cabinet.	A separate fire-rated room with sprinklers, fire detection and alarm transmission	The plan as drawn: one 16 kWh bank next to the inverter
Fire code	Applies, but a battery fire-suppression unit can replace sprinklers; detectors can connect directly to the 119 alarm transmitter	Applies in full, including sprinklers and a water source	Not triggered
Fits the plan	Yes, with placement rules (below). Confirm with the architect that the cabinet does not count as floor area.	No. It breaks the 100 m² limit, and the room is too small.	Yes
Cost and complexity	Medium. Many ready-made outdoor cabinets come with built-in detection and suppression.	High	Low
Verdict	Choose this if you want 32 kWh	Not practical here	Simplest. You can add an outdoor cabinet later.

Do not split it into two "separate" 16 kWh systems to stay under 20 kWh. The rules are likely to look at the total installed at the site, and the local fire station decides. Ask them before planning around it (see "Who to ask" at the end).

Does the office need 32 kWh? A rough sizing check

These are planning-level estimates to show the scale, not a design calculation.

	Rough figure
Solar output (A-401)	9,300 kWh/year ≈ 25 kWh/day on average. Roughly 18–22 kWh/day in winter, 30+ kWh/day in spring.
Office use on a working day, without heating or cooling (6–7 PCs and monitors, LED lighting, ventilation unit, network and hub, fridge, copier)	About 15–25 kWh, mostly in daytime
Overnight and weekend standby (ventilation, hub, network, fridge)	About 5 kWh per night or day
Solar left over on a sunny working day	About 5–15 kWh
Electric floor heating on a cold day	Probably 20–40 kWh of electricity, more than the panels make in winter

What the numbers say:

A 16 kWh battery already holds a typical day's leftover solar. A 32 kWh bank fills up mainly over weekends, holidays and sunny stretches.
In winter, the floor heating uses more than the panels produce. The battery will rarely be full, and the heat storage tank (E-102 rule 8) is the cheaper way to store extra solar as heat.
Under KEPCO net metering (상계거래), solar you send to the grid is credited against what you use later. That makes a battery save less money than it seems. Confirm with KEPCO how a battery affects your net-metering application.
What 32 kWh does buy is backup during power cuts. Essential loads (hub, network, sensors, fridge, lights, a few PCs, ventilation) draw roughly 0.5–1 kW, so the bank lasts about 16–32 hours at 16 kWh, or 1.5–3 days at 32 kWh, and longer while the sun is out. That is useful in a coastal area that gets typhoon outages. Floor heating or air conditioning would drain it much faster.

Bottom line: 32 kWh is a resilience choice, not a savings choice. If backup during outages is the goal, go with option A. If not, 16–20 kWh indoors (option C) does most of the daily job with much less regulation.

Battery bank specification (any option)

Chemistry and setup

LiFePO4 is the right chemistry. It is more heat-stable than the NMC lithium used in many EVs and lasts many thousands of cycles. It can still vent flammable gas and catch fire if abused, so the safety rules still apply.
32 kWh is typically 2 × 16 kWh packs (51.2 V, 314 Ah ≈ 16.1 kWh each) wired in parallel, or a single 32 kWh cabinet.
The battery voltage must match the inverter's battery input: a 48 V-class low-voltage battery for a low-voltage hybrid inverter, or a high-voltage battery for a high-voltage inverter. Check this before buying (A-601 already flags it).
The battery's management system (BMS) must talk to the inverter over CAN or RS485, using a protocol the inverter lists as supported. Without this "closed-loop" link, the inverter cannot charge safely.

Wiring and protection (for the electrician)

Item	Requirement
Each pack	Its own DC breaker or fuse, rated for DC and able to break a DC short-circuit current (KEC 511.2.7). Lithium packs can deliver thousands of amps into a short.
Parallel connection	Equal-length cables from each pack to a common busbar, so both packs share the load evenly
Current	A 7 kW inverter at 51.2 V draws about 140 A, about 70 A per pack. Size the cables and busbar to the inverter's maximum battery current.
Isolation	A DC disconnect switch whose open position you can see (KEC 511.2.7)
Surge	A DC surge protector on the DC side (KEC 512.1.4)
Earthing	Metal cases and racks earthed per KEC 140 (KEC 511.2.9)
Emergency stop	Automatic stop within 5 seconds, plus a manual stop button outside the battery space that is easy to reach (KEC 512.1.4)

Physical

Weight: a 16 kWh pack typically weighs 110–140 kg (check the datasheet). Stand the packs on the floor or a steel stand, never hang them on a plasterboard wall.
Temperature: LFP lasts longest at about 15–25 °C. Its BMS blocks charging below about 0 °C, and life drops when it is kept above about 35 °C.
Water: keep the batteries away from water and never under pipes.

Certification (check before buying)

Battery: Korea requires KC 62619 for ESS battery systems from 500 Wh to 300 kWh. The system needs safety confirmation (안전확인) and the cells need safety certification (안전인증). Check the exact model number on the Product Safety Information Center site (제품안전정보센터, safetykorea.kr); a KC mark printed on the case is not enough.
Risk with cheap imports: low-cost imported 16 kWh packs, like the US$1,700 one in the budget, often lack KC. That can block customs clearance, the pre-use electrical inspection (사용전검사/점검) and fire insurance cover.
Inverter: connecting to the KEPCO grid needs a Korean-certified inverter. Confirm that the exact hybrid model is approved for grid connection in Korea.

Control hub integration (E-102)

Bring BMS data (charge level, cell temperatures, alarms) into the hub. The plan already monitors this.
Keep the charge window within the maker's range. KEC 512.1.4 forbids charging past the rated maximum. A typical setting is 10–95%, and rule 9 (battery below 20% → shed loads) stays.
Rule 8 (battery above 90% → heat the storage tank) works well with a larger bank.
Add rules for BMS alarms and over-temperature: stop charging and send an alert. If the battery-area smoke or heat detector trips: shut the system down and raise the alarm. Above 20 kWh, the alarm must also reach 119 automatically.

Placement

Option A: outdoor cabinet

Rule	What it means here
Raised at least 0.3 m above ground (KEC 512.1.5)	Concrete plinth. Raise it to 0.6 m if the site is on reclaimed land (간척지) or salt pans, which is common around Goheung, for example around Goheung Bay (고흥만). The site is not chosen yet, so check this.
Distance from the building, other facilities and doors	KEC and the Korea Electrical Safety Corporation's inspection standard use about 1.5 m from surrounding buildings and facilities and 3 m from building entrances and escape routes. Confirm the current figures for your installation. The east wall has the storage and boiler-room doors and the north wall has the main entrance, so a north-east or south-east corner position away from those doors is likely.
Cabinet	An outdoor-rated ESS cabinet (IP55 or better) with built-in detection and a battery fire-suppression unit. It should be rated for coastal salt air (a C4/C5 coating or stainless steel) and anchored for typhoons.
Temperature	Shade it from afternoon sun; a north-side position runs cooler. Check that the cabinet has heating or cooling for −5 °C winters and 33 °C+ summers.
Cable route	A short DC run through the wall into the boiler/electrical room, with fire-stopping where it passes through, or put the inverter in the cabinet as well

Option C: up to 20 kWh indoors in the boiler/electrical room

Keep the batteries away from the boiler, heat storage tank and manifold. Never put them under pipes; use a raised stand with a drip tray.
Vent to the outside, and keep the room cool. The heat storage tank gives off heat, so check summer room temperatures.
Put a smoke or heat detector in the room and wire it to the hub.
Keep a fire extinguisher just outside the door. Water is what cools a lithium fire, and ABC powder does not stop thermal runaway. Korean lithium-battery extinguishers (리튬배터리 전용 소화기) are also an option.
Mount the emergency stop button outside the east door. The room already opens to the outside (A-101), which is good for firefighter access.
Leave enough clear space to service the batteries, and follow the clearances in the maker's manual.

Budget lines to add to E-102

Item	Note
Batteries 32 kWh	About US$3,400 if the US$1,700 per 16 kWh price holds, before dangerous-goods shipping (lithium is UN3480 class 9), duty and 10% VAT. KC-certified products usually cost more.
Outdoor ESS cabinet with detection and suppression	Option A only
Fire detection and 119 alarm transmitter, fire-safety design and inspection	Required above 20 kWh
DC protection: breakers or fuses, busbar, surge protector, isolator, emergency stop	Required at any size
Pre-use electrical inspection (사용전검사/점검)	At any size; scope depends on the installation

Who to ask before deciding

Goheung fire station (고흥소방서), fire prevention section (예방과): how they count capacity for 32 kWh at this office, and what they require for an outdoor cabinet compared with indoors
Korea Electrical Safety Corporation (한국전기안전공사), local office: the pre-use inspection scope, and the separation distances for an outdoor cabinet
KEPCO (한전), Goheung branch: net metering with a battery, and inverter grid-connection approval
Architect (건축사): whether an outdoor cabinet counts toward floor area or the building coverage ratio
Supplier: the KC 62619 certificate for the exact battery model, the Korean grid certification for the inverter, and the BMS communication protocol
You: confirm 32 kWh is the energy figure (not inverter power), and whether the goal is backup or savings

Sources

KEC 510 전기저장장치, clause text and explanation (scope above 20 kWh, 512.1.5, 512.1.6): https://cq4l.com/kec510%EC%A0%84%EA%B8%B0%EC%A0%80%EC%9E%A5%EC%9E%A5%EC%B9%98/
Rack clearance rules for ESS above 20 kWh (KEC 512.1.6): https://first.jobjobfire.com/184
Ministry of Trade, Industry and Energy, KEC amendment notice 2023-364 (exhaust venting, 5-second emergency stop, charge limit, outdoor height): https://www.motir.go.kr/kor/article/ATCLc01b2801b/68489/view
Lee et al., "VPL용 전기저장장치의 기술기준 분석", KAIS Spring 2023 (KEC, NFTC 607 and Korea Electrical Safety Corporation ESS standards: sprinkler 12.2 L/min·m² for 30 min, 22 m / 9 m, fire separation, outdoor exceptions, 1.5 m / 3 m): https://www.kais99.org/jkais/springNfall/spring2023/oral/2023_spring_046.pdf
Industry News, ESS above 20 kWh: fire extinguishers, sprinklers, detection and alarm transmission mandatory (2021-08-26): https://www.industrynews.co.kr/news/articleView.html?idxno=43481
Solar Today, same amendment: https://www.solartodaymag.com/news/articleView.html?idxno=11302
소방시설법 시행령 [별표2] 특정소방대상물 (amended 2025-08-26): https://www.law.go.kr/LSW/flDownload.do?gubun=&flSeq=155603905&bylClsCd=110201
Vegan News, home ESS: check the 20 kWh threshold and safety standards first (2026-10-02): https://www.vegannews.co.kr/news/article.html?no=390617
KTR, KC 62619 safety confirmation testing (500 Wh–300 kWh, including home ESS): https://ktr.or.kr/test-evaluation/led/contentsid/2044/index.do
KATS / WTO TBT notification 2022, ESS batteries under the Electrical Appliances and Consumer Products Safety Control Act: https://members.wto.org/crnattachments/2022/TBT/KOR/22_6241_02_x.pdf

Research · 바닥재 Flooring

Flooring research: Goheung office (shoes-off)

고흥사무소_바닥재_조사.md · Research date: 2026-10-27 · Goes with: 고흥사무소_계획안.pdf (Rev.0), sheet A-602

Fitting it to Rev.1

The note replaces A-602's tile carpet with 4.5 mm cushioned sheet in the office, the meeting room and the inner lobby. Nothing in Rev.1 conflicts: the insulation, screed and heating stay, and the sheet goes where the carpet tile was.
Entry strip: A-101 now draws it as a 0.7 m tile strip inside the entrance, with a low shoe bench on each side of the door. Rev.1's lobby is 2.0 m deep (change 4), and the office and toilet doors open off its sides between 0.7 and 1.7 m from the front glass, so a shallow strip lets people reach both doors on the cushioned sheet in socks.
Area: with Rev.1's 19.00 ㎡ meeting room and the smaller inner lobby, the quote is still about 72–74 ㎡ plus waste.
27 °C cap: with the heat pump running the loops at 30–35 °C (M-102), the floor surface usually sits in the mid-20s, so the cap rarely bites. Fit the floor sensor anyway and apply it to rule 8.
Floor boxes: the four in E-201 sit in the sheet. Use boxes with recessed lids that take a sheet inlay, set flush.

The brief

People will take their shoes off at the door, as is normal in Korea, so everyone walks around barefoot or in socks. The floor needs to:

damp sound (footsteps, chairs, things being dropped)
be easy on the feet (some give underfoot)
not feel cold
be easy to clean

What the plan says now (A-602): 7 mm tile carpet (타일카펫) over electric hot-water floor heating in the office and meeting room, and porcelain tile with a built-in entrance mat across the whole lobby. That was chosen for shoes-on use, so it needs another look.

Recommendation

Where	Floor
Office, meeting room, inner lobby	Cushioned PVC sheet flooring (쿠션 장판 / 층간소음 저감 바닥재), about 4.5 mm thick. Fully glued, seams sealed or welded, PVC skirting. Laid over the floor heating already in the plan.
Entry area (현관) inside the north door	Porcelain tile and a built-in mat, plus a shoe cabinet (신발장). This is where shoes come off.
Toilets	Keep the non-slip porcelain tile, and put out toilet slippers (화장실 슬리퍼).
Boiler/electrical room, storage	Keep the epoxy. Both have outside doors, so people go in with shoes on.

This replaces the tile carpet. Cushioned sheet is soft and warm underfoot like carpet, but it can be wet-mopped and does not soak up sweat or spills. It is also the standard finish laid over ondol floor heating in Korea, so it works with the planned heating.

Three other things are needed to make it work: - Office chairs get soft-tread castors (the kind made for hard floors). Hard castors leave dents and grooves in cushioned flooring. - The control hub limits the floor surface temperature to about 27 °C. Confirm the exact limit for the product you choose. - Use 4.5 mm, not 6 mm. The extra thickness mostly reduces noise for a room below, and this building has none. 4.5 mm is firmer under chairs and lets heat through faster.

How each requirement applies to this building

1. Sound

This is a single-storey building on a ground slab, so there is no room below. That matters when reading product brochures. The headline numbers on Korean cushioned flooring (for example "경량충격음 −22 dB") measure noise carried to the apartment downstairs (층간소음). That is not a problem here.

The noise that matters in this office is:

Noise	Does cushioned flooring help?
Things dropped, chair legs knocking, feet landing	Yes, a lot. The foam layer takes the impact, so a dropped pen thuds instead of clattering.
Office chairs rolling	Yes, as long as the chairs have soft castors.
Footsteps	Already quiet barefoot or in socks. Any soft floor is fine.
Echo and voices carrying across the room	Not much. Hard-surfaced floors absorb very little sound from the air. Carpet does absorb some, so the room will echo a little more if the tile carpet goes.

What this means for the plan: Keep the acoustic ceiling tiles (흡음 텍스) in the office and the acoustic panels and wood louvres in the meeting room. They now do the echo control the carpet was also doing. If the reception corner (응접) still sounds lively, add a washable rug there.

The flooring industry says much the same. Milliken, a commercial flooring maker, lists glued-down hard vinyl tile (LVT) at only about 2 dB of impact-noise reduction, against 13–19 dB for products with a cushion layer. It also says hard floors "will not absorb ambient sound in the way that textile surfaces can".

2. Easy on the feet

Cushioned sheet has a foam layer under a hard-wearing PVC top layer, so it gives a little underfoot. Korean makers sell it on comfort for knees and joints. LX's double-cushion "X-Comfort" line, for example, claims about 1.2× the cushioning and springback of its 4.5 mm 소리잠 sheet.

Engineered wood (강마루), hard vinyl tiles (데코타일/LVT) and porcelain have almost no give. KCC says its 6 mm cushioned sheet reduces noise about 58% more than ordinary 강마루 and absorbs more than twice the impact.

3. Not cold

Two separate things decide whether a floor feels cold:

The floor's actual temperature. The plan already deals with this: electric hot-water floor heating in every heated room, 100 mm insulation (XPS) under the slab, and insulation around the slab edge so the floor by the windows and outside walls stays warm.
How fast the material pulls heat out of a bare foot. Tile and stone feel cold even at room temperature because they draw heat away quickly. Foam-backed vinyl, cork, wood and carpet feel warmer at the same temperature. This matters most in spring, autumn and on early mornings, when the heating is off or just starting.

Cushioned sheet does well on both: its foam layer feels warm to the touch, and it is made to go over Korean ondol heating.

The trade-off is that thicker, softer layers slow heat coming up from the pipes. The European floor-heating standard (EN 1264) conservatively suggests a floor covering of no more than 0.15 m²K/W (1.5 tog). Thick carpet is the main concern there, which is why the plan specified a low-thermal-resistance carpet tile. 4.5 mm sheet passes heat more easily than 6 mm.

Surface temperature limit: Vinyl makers usually allow a maximum floor surface temperature of about 27 °C. Some allow 29 °C for some product types. This interacts with E-102 rule 8 (when there is surplus solar power and the battery is above 90%, pre-heat the storage tank and floor). Cap the floor surface temperature with a floor sensor and put the extra heat into the storage tank instead.

4. Easy to clean

Barefoot and sock-wearing offices collect hair, skin, dust and foot sweat rather than outdoor dirt. The office also has a pantry counter (탕비), where coffee gets spilled.

	Cushioned sheet	Tile carpet (current plan)
Daily	Dry mop or vacuum	Vacuum
Spills	Wipe up	Blot it and hope; a stained tile has to be swapped
Bare-foot hygiene	Can be wet-mopped with neutral detergent	Fibres hold sweat, skin oils and dust mites; needs periodic extraction cleaning
Goheung's humid summers	No change	Can start to smell

With a seamless, wet-mopped floor, you can see that it is clean.

The options compared

"Feels warm" here means with the floor heating off.

Option	Soft underfoot	Feels warm	Impact noise	Echo	Cleaning	Office chairs	Floor heating	Verdict
Cushioned PVC sheet, 4.5–6 mm (쿠션 장판)	Good	Good	Good	Low	Good	OK with soft castors	Good, made for ondol	Recommended
Standard PVC sheet, 2.2–3.2 mm (일반 장판)	OK	OK	OK	Low	Good	Good	Good	Budget fallback
Hard vinyl tile (LVT / 데코타일), glued	Poor	OK	Poor (~2 dB)	Low	Good, but many joints	Good	Good	Too hard and noisy for bare feet
Engineered wood (강마루)	Poor	OK	Poor, clicky	Low	Good	Scratches	Good	Common in Korea, but hard
Tile carpet (current plan)	Good	Good	Good	Best	Poor	Good, with hard castors	OK if low thermal resistance	Not ideal for shoes-off
Cork (코르크)	Good	Good	Good	Some	OK, needs resealing	Dents	OK, per maker	Nice, natural, but costly and hard to source locally, and fades in sun

Products to look at (Korean makers)

These are residential product lines. The noise figures are the makers' own claims about noise reaching the room below, so they are useful only for comparing products with each other. Product lines change, so confirm what is current with a dealer (대리점). The nearest showrooms are likely in Suncheon or Gwangju.

Maker	Product	Thickness	What the maker claims
LX Hausys (LX Z:IN)	지아 소리잠 4.5 / 6.0	4.5 / 6.0 mm	Sound-damping layer underneath; −22 / −26 dB impact noise vs bare slab (test by Daewoo E&C's research institute); environmental label (환경표지) and atopy-safe mark (아토피 안심마크)
LX Hausys (LX Z:IN)	엑스컴포트 (X-Comfort)	Ask	Two cushion layers (soft top, springy bottom); ~1.2× the cushioning of 소리잠 4.5T; better slip resistance; environmental label
KCC Glass / Homecc	숲 소리휴	6.0 mm	High-elasticity cushion layer; about −19 dB impact noise (KCL test); environmental label; cedar-oil UV coating; stone-look patterns in 600×600 and 600×1200
Hyundai L&C	아티움 (Artium)	2.7 / 3.2 mm	High-elasticity cushion layer; reduces everyday noise
Hyundai L&C	더채움	2.2 mm	Cushion layer; 61 dB vs 77 dB on bare slab (company test)

How to choose: Take samples, or go to a showroom, and walk on them barefoot over a heated floor. Press a chair castor into each sample and see whether the mark comes back. Pick the thinnest one that still feels soft enough.

Changes this means for the plan (A-602)

Room	Now (A-602)	Proposed
사무실 (office)	타일카펫 + 바닥난방	쿠션 장판 4.5T, fully glued, seams sealed or welded, PVC skirting, + 바닥난방
회의실 (meeting room)	타일카펫 + 바닥난방	Same as the office, continuous with no threshold
로비 (lobby)	포세린 타일 + 매립 현관 매트 across the whole lobby	Tile and mat only in an entry strip (현관) about 1.0–1.2 m deep inside the north door, with a 신발장 and a bench to sit on. The rest of the lobby gets the same sheet as the office.
화장실 (toilets)	논슬립 포세린 타일 + 바닥난방	No change, plus toilet slippers and a small threshold at the door to keep water in
보일러·전기실, 창고	에폭시	No change (shoes-on rooms with outside doors)
Meeting room's south sliding door to the deck	(none)	A slipper rack at the deck for stepping outside

Area to quote: office 49.70 + meeting room 17.48 + inner lobby about 6.5 = about 74 m². These are A-001's wall-centreline areas, so the real floor area is a little smaller. Add about 10% for cutting waste.

Make the shoes-off line flush, not a step: A traditional sunken 현관 would mean cutting into the 100 mm under-slab insulation at the door, which brings back the cold floor edge the plan is trying to avoid. A step is also a trip hazard for visitors. Instead, keep the floor level and mark the shoes-off line with the change from tile to sheet, the entrance mat and the shoe bench.

Floor build-up: The 4.5 mm sheet replaces the 7 mm carpet tile. The 2.5 mm difference can be made up in the 50 mm heating screed (방바닥 몰탈). Nothing else in the A-602 build-up changes.

Notes for the installer

The screed must be dry. Vinyl sheet seals the floor, so damp screed underneath leads to glue failure, smells and mould. Run the floor heating to dry the screed before laying, raising the temperature gradually. Lower the heating while the sheet is laid and for a few days after, following the product's guide. Ask the installer to check the moisture level before they start.
Fully glue the sheet (전면 접착). Do not loose-lay it with tape at the edges, as is common in homes. Rolling chairs push loose sheet into ripples.
Keep seams few and sealed: heat-welded, or sealed with the maker's seam sealer. Run them away from the desk and chair areas.
Edges: fit PVC skirting, or turn the sheet up the wall (굽도리), so mop water cannot get under the edge.
Cap the floor temperature at about 27 °C with a floor sensor wired to the hub (see E-102 rule 8 above).
Choose a low-emission product, because people will be touching it with bare skin. Ask for the environmental label (환경표지), the top HB grade (HB 최우수), and a non-phthalate plasticiser (친환경 가소제).
Matte or embossed surface, and never wax or polish it. Socks slip on glossy vinyl.
Chairs: use soft-tread castors. The EN 12529/12528 standards call these "type W", made for hard floors. The hard "type H" castors made for carpet dent and groove cushioned sheet. Add clear chair mats at the desks if you choose 6 mm.
Heavy furniture: put wide pads under the document cabinets and the copier/plotter. Cushioned sheet dents under point loads.
Sun: the 900 mm eave shades the south windows in summer, but in winter the sun reaches about 3.4 m into the room (A-301). Choose a UV-coated product so the floor does not fade near the windows.

Cleaning routine

Daily: dry mop or vacuum (hair and dust).
Weekly: damp mop with neutral detergent (중성세제).
Avoid: solvent cleaners, harsh bleach and steam mops (they can weaken the seams and glue), and wax or polish.
Entrance mat: vacuum it and lift it out to clean underneath now and then. It is the only floor that sees outdoor dirt.

Still to confirm

Current product lineup and the thickness of X-Comfort, from a dealer
Maximum floor surface temperature for the chosen product (enter it into the hub's rules)
Barefoot walk test on samples over a heated floor
Quotes with material and labour priced separately, for about 74 m² plus waste
Whether the office chairs being bought come with, or can take, soft castors

Sources

LG/LX Hausys, 지아 소리잠 4.5 / 6.0 launch release: https://www.lg.co.kr/media/release/2647
LG Hausys, 엑스컴포트 launch release: https://lg.co.kr/media/release/20577
Hankyung, LX Z:IN 엑스컴포트 double-cushion structure (2025): https://www.hankyung.com/article/2025032433811
Star News Korea, KCC 숲 소리휴 6 mm, KCL test (2026-08): https://www.starnewskorea.com/business-life/2026/08/27/2026082710254296500
New Daily, 6 mm as the practical thickness limit for cushioned sheet (2015): https://biz.newdaily.co.kr/site/data/html/2015/06/08/2015060810001.html
Hankyung, Hyundai L&C noise-reducing flooring (2025): https://www.hankyung.com/article/202505076790i
CEO Score Daily, Hyundai L&C noise-reducing lineup (2022): https://ceoscoredaily.com/page/view/2022091509031240671
Milliken, choosing LVT for offices (impact-noise figures by backing type): https://europeblog.milliken.com/how-to-choose-the-best-lvt-for-new-offices
Milliken, flooring and interior acoustics: https://www.milliken.com/es-es/sustainability/blogs/flooring-that-improves-interior-acoustics
Warmup, vinyl over underfloor heating (27 °C): https://www.warmup.co.uk/underfloor-heating/floor-coverings/vinyl
Floorify, maximum floor temperature by vinyl type: https://www.floorify.com/en-GB/support/undefined/can-you-install-a-vinyl-floor-on-an-existing-floor-with-underfloor-heating
Warmup, carpet over underfloor heating (tog limits): https://www.warmup.co.uk/underfloor-heating/floor-coverings/carpet
MODBS, BSRIA tests on carpet and underfloor heating: https://modbs.co.uk/news/fullstory.php/aid/3100/Tests_prove_that_underfloor_heating_and_carpets__can
Homebuilding, cork flooring pros and cons: https://www.homebuilding.co.uk/advice/cork-flooring
CATAS, castor standards EN 12528 / EN 12529 (type H and W): https://catas.com/en-GB/news/come-verificare-le-prestazioni-delle-ruote-di-sedute-e-mobili
Tente, choosing office chair castors by floor type: https://www.tente.com/en-cz/know-how/castors-for-office-chairs

Rev.0

부록 · Appendix

Sheet set and the original plan

The Rev.1 sheet set first, then everything from the Rev.0 PDF: its data, the reference photos and all 12 original sheets.

Rev.1 도면 세트 · Updated sheets

The architectural sheets, updated for Rev.1

Rev.1 versions of the PDF's A-101, A-201, A-301, A-401 and A-501, with the solar deck. Click a sheet to open it full size. The same drawings appear in the review above, and the originals they replace are marked in the gallery below.

본문에서 보기

Appendix · 원본 계획안

From the Rev.0 PDF

Everything this review relies on from 고흥사무소_계획안.pdf (Rev.0, 2026.10.23), so this file stands on its own. The text is as written in the PDF. Where Rev.1 replaces something, a red tag names the change, and a blue tag points to the research note that updates it. All 12 original sheets are at the end.

개요 · Project data 표지 · A-001

30평 박공지붕 하나 아래에 사무실동과 서비스동(화장실·보일러실·창고)을 나눠 앉히고, 그 사이를 남북으로 관통하는 유리 회의실로 비웠습니다. 남측 지붕면의 태양광 7.10kW와 배터리 16kWh로 전기를 만들고 저장하며, 보일러·에어컨·공조를 하나의 제어 허브로 연동합니다. 6~7명이 근무하는 기준입니다.

위치: 전라남도 고흥군 (지번 미정)
용도: 사무소 · 제2종 근린생활시설
규모: 지상 1층, 박공지붕 경사 20°
연면적: 99.40㎡ (30.07평)
외곽 치수: 14,200 × 7,000 mm (벽 중심)
최고 높이: FL +4,594 mm
구조: 철골조 + 외단열, 치장벽돌 박공벽 Rev.1 → 철골 + 단열 판넬
에너지: 태양광 7.10 kWp + 배터리 16 kWh Rev.1 → 10: 데크 캐노피 7.74 kWp
설비: 통합제어: 냉난방 · 공조 · 습도 · 출입
근무 인원: 6~7명 (근무석 6 + 대표석 1)
작성: 2026.10.23 · 계획안 Rev.0

건축기준 반영 · How Rev.0 meets the brief A-001

#	건축기준	계획 반영 (Rev.0)
1	30평 규모, 박공구조 지붕	외곽 14.2 × 7.0m = 99.40㎡(30.07평). 동서로 긴 단일 박공지붕, 용마루는 동서 방향이라 남측 경사면이 통째로 태양광 면이 됩니다. 연면적은 100㎡ 아래로 유지했습니다.
2	사무실 면적 15평	서측 사무실동 7.1 × 7.0m = 49.70㎡(15.03평). 근무석 6 + 대표석 1 + 응접. Rev.1 → 3
3	화장실 2평 · 창고 3평 · 보일러룸 2평을 하나로	동측 서비스동 3.3 × 7.0m = 23.10㎡ 한 덩어리. 북→남 순서로 화장실 · 보일러·전기실 · 창고를 쌓았습니다.
4	사무실과 나머지를 분리, 가운데는 통로처럼 비움	두 동 사이 3.8m 폭 공간이 북측 주출입에서 남측 데크까지 관통합니다. 같은 지붕 아래 있지만 입면에서는 두 매스가 떨어져 보입니다.
5	비운 공간에 유리 벽체로 회의실	남·북 양면 유리 커튼월. 3.8 × 7.0m = 26.60㎡ 중 남측 4.6m는 7인 회의실, 북측 2.4m는 로비. 둘 사이는 TV·수납 가구벽과 상부 유리로 나눕니다. Rev.1 → 4
6	지붕에 7kW 태양광	남측 경사면에 645W 모듈 11장 1열 세로 배치 = 7.10kWp. 스탠딩심 클램프로 고정해 지붕에 구멍을 뚫지 않습니다. Rev.1 → 10: 지붕 대신 데크 캐노피
7	전체 사무실 건축	이 문서는 평면 · 입면 · 단면 · 지붕 · 외관 · 재료까지의 계획설계 단계입니다. 인허가용 실시설계는 대지 확정 후 진행합니다.
8	Central System: 온습도·배터리 모니터링, 에어컨, 보일러, 도어락, 공조	보일러·전기실에 제어함(라즈베리파이 + 네트워크 스위치)을 두고 모든 센서와 기기를 한 허브로 묶었습니다. 센서·기기 위치는 E-101, 연결 구조는 E-102.
9	Main System: 공기질·습도 55%·필터, 사람·온도·전기 모니터링, 원격 제어, 전기 온수 바닥난방, 출입 관리	공기질·온습도·재실 센서를 실마다 두고, 전열교환기(필터)와 제습·가습기로 습도 55%를 유지합니다. 출입은 도어락 기록과 로비 카메라로 남기고, 클라우드 앱으로 원격 제어합니다. 바닥난방은 전기 온수 보일러 + 축열탱크. Rev.1 → 7
10	보일러 · 공기질 시스템 · 에어컨 연동	허브의 자동 연동 규칙 9개로 묶었습니다. 냉난방 동시 운전 방지, 태양광이 남을 때 바닥 축열 등은 E-102 규칙표에 있습니다.
11	바닥: 사무실 타일카펫, 단열, 소음 없이, 발이 춥지 않게	단열 100 + 전기 온수 바닥난방 + 바닥난방용 타일카펫, 슬래브 둘레 단열로 창가 바닥 냉기를 막습니다. 바닥 구성과 실별 마감은 A-602. 바닥재 조사 → 쿠션 장판

Items 1–7 are the 건축기준 memo. Items 8–11 are the system and floor requirements that the PDF adds.

면적표 · Areas A-001 · 벽체 중심선 기준

실	치수 (m)	㎡	평
사무실	7.1 × 7.0	49.70	15.03
유리 회의공간	3.8 × 7.0	26.60	8.05
회의실	3.8 × 4.6	17.48	5.29
로비	3.8 × 2.4	9.12	2.76
서비스동	3.3 × 7.0	23.10	6.99
화장실	3.3 × 2.0	6.60	2.00
보일러·전기실	3.3 × 2.0	6.60	2.00
창고	3.3 × 3.0	9.90	2.99
합계 (연면적)	14.2 × 7.0	99.40	30.07

Rev.1 changes the lobby to 3.8 × 2.0 (7.60 ㎡) and the meeting room to 3.8 × 5.0 (19.00 ㎡). Everything else is the same.

배치 가정 · Site assumptions A-001

대지 정보가 아직 없어 북측 진입 · 남측 마당으로 가정했습니다. 주출입은 북측 유리면, 남측 유리면은 데크와 마당으로 열립니다.
건물 장변을 정남향으로 앉혀야 태양광 효율과 겨울 일사가 가장 좋습니다. 대지 방위가 틀어지면 평면은 그대로 두고 앉히는 각도만 조정합니다.
창고·보일러실 문은 동측 박공벽에 내서, 현장 자재와 설비 점검이 사무 동선과 섞이지 않게 했습니다.
1평 = 3.3058㎡로 환산했습니다.

실별 계획 · Rooms A-101

사무실 · 49.70㎡

근무석 1,400×700 책상 6개를 3×2 아일랜드로 놓고, 가운데 칸막이를 세웠습니다. 대표석 1,800×800은 서측 벽을 등지고 직원석을 바라봅니다. Rev.1 → 1, 2

남측 연창 5.2m로 채광, 북측 고창(창대 1,600)으로 맞통풍. 북측 벽에 문서 수납장 · 복합기·플로터 · 탕비 카운터를 모았습니다.

천장고 2,700 평천장, 천장 속에 냉난방·조명 설비.

회의실 · 로비 · 26.60㎡

2,400×1,000 테이블에 7석. 남측 유리 슬라이딩 도어로 데크와 이어집니다.

로비 쪽 가구벽(높이 2,100) 앞면에 TV, 뒷면은 로비 수납. 위로는 유리라 경사 천장이 끊기지 않습니다. Rev.1 → 4, 5

로비에서 사무실(미닫이), 화장실, 회의실로 바로 갈라집니다.

서비스동 · 23.10㎡

화장실: 공용 세면 + 남·여 WC 부스 2개.

보일러·전기실: 전기 온수 보일러, 바닥난방 분배기, 축열탱크, 분전반, 하이브리드 인버터, 배터리 16kWh, 제어함(라즈베리파이·스위치)을 모았습니다. 외부에서 바로 점검. Rev.1 → 7, 8

창고: 외부 쌍여닫이 1,600으로 자재·장비를 바로 들이고, ㄱ자 선반과 제습기를 둡니다.

입면 · Elevations A-201

장변(남·북)은 흑회색 금속패널에 600 간격 세로 줄눈, 박공면(동·서)은 적벽돌 치장쌓기. 참고 사진의 회색 지붕 + 적벽돌 박공 조합을 그대로 따릅니다.

레벨: GL −300 · FL ±0 · 처마 +3,000 · 최고 +4,594
동측 출입: 창고 쌍여닫이 1,600 · 보일러실 900
그려진 입면: 남측 (마당 쪽) · 북측 (주출입 쪽) · 동측 (박공면) Rev.1: 서측 추가

단면 · Section A-A A-301

처마 900의 역할. 고흥(북위 약 34.6°)의 하지 남중고도는 78.8°. 남측 처마 900만으로 정오 무렵 유리면 전체가 그늘에 들어갑니다. 동지 남중고도는 32.0°. 해가 처마 아래로 들어와 바닥 깊이 약 3.4m까지 닿아 겨울 난방 부담을 덜어줍니다. 처마 돌출을 1m 미만으로 둬서 건축면적 산정에도 영향을 주지 않습니다. Rev.1 → 10

높이. 회의실·로비는 경사 노출천장: 벽쪽 3,000 → 가운데 4,274. 사무실·서비스동은 평천장 2,700. 지붕 두께(구조+단열) 약 320, 최고 높이 FL +4,594. Rev.1: 로비 평천장 2,400

지붕 · 태양광 · Roof and solar A-401 Rev.1 → 10: 데크 캐노피로 이동, 12장 · 10°

모듈: 645W급 단결정, 2,382×1,134
수량: 11장 · 1열 세로
용량: 7.10 kWp
배열: 12,674 × 2,382 (지붕 길이 15,400)
방위·경사: 정남 · 20° (지붕 경사)
고정: 스탠딩심 클램프, 무타공
인버터: 7kW급, 보일러·전기실
예상 발전량: 연 약 9,300 kWh

예상 발전량은 일평균 발전시간 3.6시간을 가정한 개략치입니다.
최적 경사(약 30°)보다 조금 눕지만 손실은 몇 % 수준이고, 지붕과 일체로 보여 외관이 깔끔합니다.
용마루·처마·박공 끝에서 각각 400 이상 띄워 바람과 유지보수 여유를 뒀습니다. 같은 1열로 12장(7.74kW)까지 늘릴 여유가 있습니다.

재료 · Materials A-601 · 참고 사진 기준

지붕
징크 또는 칼라강판 스탠딩심, 짙은 회색. 처마 물받이 매립. Rev.1: 지붕 판넬 150
장변 외벽
흑회색 금속패널, 600 간격 세로 줄눈. 외단열 위 마감. Rev.1: 단열 판넬 125
박공벽 (동·서)
적벽돌 치장쌓기. 참고 사진과 같은 색감.
유리 회의실
로이 복층유리 커튼월, 흑색 알루미늄 프레임.
태양광 모듈
블랙 프레임 모듈로 지붕색과 맞춤. Rev.1: 캐노피용 유리-유리 모듈
데크 · 가구벽
남측 데크는 합성목재, 회의실 가구벽은 오크 무늬목.

참고 1: 논 옆 도로에서 본 단층 박공 건물, 지붕에 태양광 — 참고 1 · 지붕 태양광, 단층 박공

참고 2: 적벽돌 박공면과 회색 지붕, 쇄석 마당 — 참고 2 · 적벽돌 박공면

참고 3: 흑회색 세로 분절 패널 외벽과 적벽돌 박공 — 참고 3 · 회색 패널 + 세로 분절

참고 4: 쇄석 마당과 진입로, 울타리 — 참고 4 · 쇄석 마당 · 진입로

법규 기본 검토 · Code check A-601

반영
건축신고 범위
연면적 100㎡ 이하 신축은 허가가 아닌 신고 대상입니다(건축법 제14조). 유리 회의실까지 포함해 99.40㎡로 맞췄으니, 처마나 실을 늘릴 때 100㎡를 넘기지 않도록 주의해야 합니다. Rev.1: 관리·농림지역은 200㎡ 미만
반영
용도
사무소 500㎡ 미만은 제2종 근린생활시설입니다. 대지의 용도지역에서 허용되는지 확인해야 합니다.
반영
처마 돌출
900으로 1m 미만이라 건축면적에 처마가 들어가지 않습니다. Rev.1 → 10: 캐노피는 건축면적 확인
확인
건폐율 · 대지 면적
건폐율 20~40% 지역이라면 대지가 약 250~500㎡ 필요합니다.
확인
도로 · 오수
폭 4m 이상 도로에 2m 이상 접해야 합니다. 공공하수도가 없으면 개인하수처리시설(정화조)이 필요합니다. Rev.1: M-101, 결정 E
확인
배터리 실내 설치
리튬 배터리는 사무실 밖 보일러·전기실에 두고, 환기 · 벽과의 이격 · 리튬용 소화기를 갖춥니다. 연소식 보일러가 없는 전기 방식이라 같은 실에 둘 수 있습니다. Rev.1 → 8
확인
태양광 계통연계
자가소비 + 한전 상계거래로 할지, 전력 판매로 할지에 따라 신청 절차가 달라집니다.

이 계획안은 기획·계획설계 단계 자료입니다. 법규 항목은 일반 기준을 요약한 것이며, 실시설계와 인허가는 건축사사무소와 고흥군청 확인을 거쳐 확정해야 합니다. 구조(철골 부재, 기초)와 태양광 하중은 구조 검토가 필요합니다.

결정이 필요한 것 · Open questions in Rev.0 A-601

대지
위치 · 방위 · 진입 방향
지번과 진입 도로를 알면 배치도와 주차·마당 계획을 추가하고, 출입구 위치를 맞춥니다. 결정 B
화장실
남·여 분리 vs 1실 넓게
지금은 남·여 부스 2개입니다. 방문객이 적다면 세면 포함 1실(장애인 겸용 가능)이 더 쾌적합니다. 결정 C
난방
바닥 전기 온수 DC / AC
메모의 "DC / AC"를 두 방식으로 봤습니다. AC 전기보일러는 인버터를 거쳐 일반 전기로 돌리는 방식이라 단순하고 제품이 많습니다. DC 히터는 태양광 직류로 축열탱크를 바로 데우는 방식입니다. 계획은 AC 보일러 + 축열탱크이고, DC 직결 히터는 보조로 추가할 수 있습니다. Rev.1 → 7 · 결정 A
메모
"세까지 방법"의 뜻
필터 옆에 적혀 있어 필터 세척·교체 방법으로 보고, 운전시간 기준 알림으로 반영했습니다. 다른 뜻이면 알려주세요.
배터리
16kw = 16kWh?
용량(kWh)으로 보고 계획했습니다. 전압(48V/51.2V)이 하이브리드 인버터와 맞는지, 국내 설치·계통연계 시 KC 인증이 필요한지 구매 전에 확인해야 합니다. 배터리 조사 → 32 kWh
창고
반입문 크기
지금은 1,600 쌍여닫이입니다. 인버터·모듈을 지게차나 팔레트로 들인다면 2,400 이상 오버헤드 도어로 바꿔야 합니다. 결정 D

바닥 상세 · 실내 마감 · Floor build-up and finishes A-602

타일카펫 7500×500, 바닥난방용 저열저항 제품 바닥재 조사 → 쿠션 장판 4.5
방바닥 몰탈 50전기 온수 배관 Ø16 @200 매립 Rev.1: 히트펌프 온수, M-102
경량기포콘크리트 40축열 · 배관 받침
압출법 단열재(XPS) 100두께는 에너지절약설계기준으로 확정
방습필름 0.1땅에서 올라오는 습기 차단
콘크리트 슬래브 150
쇄석 다짐
슬래브 둘레 단열창가·벽쪽 바닥 냉기(열교) 차단

실	바닥	벽	천장
사무실	타일카펫 + 바닥난방 쿠션 장판	석고보드 2겹 + 흡음재 충진, 도장	흡음 텍스 평천장 CH 2,700
회의실	타일카펫 + 바닥난방 쿠션 장판	유리 커튼월, 오크 가구벽 + 흡음 패널	노출 경사천장, 목재 루버 + 흡음재
로비	포세린 타일 + 매립 현관 매트, 바닥난방 현관 띠만 타일	유리, 수납 가구벽	노출 경사천장, 목재 루버 Rev.1 → 5
화장실	논슬립 포세린 타일, 바닥난방	벽 타일	방수 석고보드, 환기팬
보일러·전기실	에폭시 코팅	불연 마감	노출
창고	에폭시 코팅 (자재 하중)	노출	노출

발이 춥지 않게

사무실 · 회의실 · 로비 · 화장실 전체에 전기 온수 바닥난방을 넣습니다.
슬래브 아래 단열 100과 슬래브 둘레 단열로 창가와 외벽 쪽 바닥이 차가워지는 것을 막습니다.
타일카펫은 바닥난방 호환 표기가 있는 저열저항 제품으로 골라야 열이 잘 올라옵니다.
로비 현관 매트가 신발에 묻은 찬 기운과 먼지를 거릅니다.

소음 없이

타일카펫으로 발소리와 의자 끄는 소리를 줄이고, 사무실 천장은 흡음 텍스입니다.
사무실과 로비 사이 벽은 흡음재를 채운 차음벽입니다. 회의실은 복층 유리와 흡음 가구벽으로 울림을 잡습니다.
에어컨 실외기는 사무실에서 먼 서비스동 북측에 둡니다. 배터리 · 인버터 · 제어함은 사무실 밖 보일러·전기실에 있습니다.
전열교환기는 저소음형으로 하고 방진 행거로 매답니다. Rev.1 → 6

설비 · 센서 · Sensors and devices E-101 Rev.1 → C-101 모니터링

기호	내용
TH	온도·습도 센서 · 5개
AQ	공기질 센서 (CO₂·PM2.5·VOC) · 2개
PS	재실(사람) 센서 · 3개
DL	도어락 (출입 기록) · 주출입 · 창고 · 보일러실
CAM	출입 카메라 · 로비
CT	전력 계측 (분전반)
AP	와이파이 AP (천장)
CP	제어 패널 (벽부 태블릿)
AC	에어컨: 사무실 천장형 + 회의실 벽걸이, 실외기 1대 Rev.1: 벽걸이 동측 벽
ERV	전열교환기 (공조·필터), 사무실 천장 속 Rev.1 → 6
DH	제습·가습기: 사무실, 창고 Rev.1: 사무실 청정제습기·가습기, 창고 제습기

배치 원칙

온습도·공기질 센서는 바닥에서 1.2~1.5m, 창과 에어컨 바람을 피한 벽에 답니다.
센서·AP·카메라는 제어함에서 랜선(PoE)으로 전원과 통신을 같이 받습니다.
전열교환기 덕트는 사무실 천장 속으로 지나 로비와 회의실에 공기를 보냅니다.
창고에도 습도 센서와 제습기를 둬서 보관 중인 인버터와 자재를 습기로부터 보호합니다.

통합제어 · Control system E-102 · Central System + Main System Rev.1 → 모니터링 · Pico 노드 + 허브

감지 · Sensors

온도 · 습도: 5개 · 실마다 1개
공기질: CO₂ · PM2.5 · VOC · 2개
재실(사람) 감지: 사무실 · 회의실 · 로비
출입 기록: 도어락 3 · 로비 카메라 · 누가 언제

중앙 제어 허브

라즈베리파이 · AI 자동 규칙, 재실·출근 패턴 학습
네트워크 스위치 (PoE)
보일러·전기실 제어함
클라우드 앱: 스마트폰 원격 제어 · 알림 · 기록 (인터넷)

제어 · Devices

에어컨: 냉방 · 제습 모드
전기 온수 보일러: 바닥난방 · 축열탱크 Rev.1 → 7
공조 (전열교환기): 환기량 · 필터
제습 · 가습기: 목표 습도 55%
도어락: 원격 개폐 · 출입 권한

에너지 계통 · Energy

태양광 7.10 kWp · 지붕 남측 (DC) Rev.1 → 10
하이브리드 인버터: DC → AC · 충방전 Rev.1 → 8: 한 줄로 건물 전체
배터리 16 kWh: BMS 잔량·온도 감시
분전반: CT 전력 계측 → 에어컨 · 보일러 · 공조 · 조명 Rev.1: E-301
한전 계통: 상계거래 · 비상 전원
발전량 · 배터리 잔량 · 사용 전력을 허브로

자동 연동 규칙 (설정값 예시)

#	조건	동작
1	습도 55% 초과	에어컨 제습 모드, 냉방이 필요 없으면 제습기만 가동
2	겨울 습도 40% 미만	가습기 가동, 55%에서 정지
3	CO₂ 1,000ppm 또는 PM2.5 35㎍/㎥ 초과	전열교환기 강풍, 필터 운전
4	필터 운전시간 누적	세척·교체 알림을 앱으로 전송
5	도어락 첫 출입 (출근)	근무 모드: 냉난방 · 공조 시작. 평소 출근 시간을 학습해 미리 예열·예냉
6	재실 없음 30분 / 마지막 퇴실	절약 온도로 전환, 공조 저속, 경비 모드
7	냉방과 난방 요청이 겹칠 때	보일러와 에어컨이 동시에 돌지 않게 실온 기준으로 하나만 운전
8	태양광 남음 + 배터리 90% 이상	전기 보일러로 축열탱크·바닥을 미리 데움 Rev.1: 히트펌프로 같은 방식
9	배터리 20% 미만	제습기·가습기 등 급하지 않은 부하를 줄이고 알림

사람 관리 (누가 들어왔는지)

도어락은 지문 · 카드 · 앱 인증으로 사람마다 기록이 남습니다. 직원별 출입 권한과 시간대를 앱에서 정합니다.
로비 카메라는 주출입 쪽만 비추고, 화장실 방향은 찍지 않게 설치합니다.
카메라를 달면 안내판을 붙이고 직원 동의를 받아야 합니다(개인정보보호법).

모니터링 화면 (앱 · 벽 패널)

실별 온도 · 습도 · 공기질 · 재실 여부
태양광 발전량, 배터리 잔량, 사용 전력, 한전 수전량
출입 기록, 기기 운전 상태, 필터 알림
인터넷이 끊겨도 허브 안의 규칙은 계속 돌아갑니다.

예산 항목 · Budget items E-102

항목	사양 (계획)	금액	상태
에어컨	사무실 천장형 + 회의실 벽걸이, 실외기 1대	2,400,000원	메모 금액
배터리	16kWh (메모 표기 "16kw"), 배송 포함 배터리 조사 → 32 kWh ≈ US$3,400	US$1,700	메모 금액
습기기 (제습·가습기)	사무실 1 + 창고 1, 목표 55%	—	견적 필요
보일러	전기 온수 보일러 + 축열탱크 + 분배기 Rev.1 → 7	—	견적 필요
AI System	자동 연동 규칙, 출근 패턴 학습	—	견적 필요
Cloud App	원격 제어 · 알림 · 기록	—	견적 필요
Raspberry Pi	중앙 제어 허브	—	견적 필요
Network switch	PoE 스위치 (센서 · AP · 카메라 전원)	—	견적 필요
하이브리드 인버터	배터리를 쓰려면 필요 (일반 태양광 인버터는 충전 불가)	—	추가 항목
센서류	온습도 5 · 공기질 2 · 재실 3 · 전력 CT 1	—	추가 항목
도어락 · 카메라	도어락 3 · 출입 카메라 1	—	추가 항목
전열교환기	공조 · 필터, 덕트 포함	—	추가 항목
와이파이 AP · 벽 패널	천장 AP 1 · 벽부 태블릿 1	—	추가 항목

메모에 금액이 있는 두 항목만 금액을 넣었습니다. "추가 항목"은 메모에는 없지만 이 시스템을 돌리려면 필요한 것들입니다.

원본 도면 · All 12 sheets 고흥사무소_계획안.pdf

Click a sheet to open it full size.

What Rev.0 gets right

Ten changes

Turn the desks 90° to the window

Close the west wall behind the director

Meet visitors in the meeting room

Shorten the lobby and make the partition glass

Use the lobby ceiling as a service bridge

Move the ERV out of the office ceiling

Heat the floor with an air-to-water heat pump

Panel, inverter and battery on one power line

Fix the frame lines before the structural review

Move the solar panels off the roof onto a deck canopy

Smaller fixes

Your call

Heating: electric boiler or heat pump

What the services layout settles

What it watches and switches

The web app

Opening the door from a phone

Ground rules for the system

Rules 17–32, added to E-102's rules 1–9 and the lighting note's 10–16

Parts list

LED lighting plan: Goheung office (inside and outside)

The brief

The plan in short

Light levels

Interior fixtures

Positions and the reasons for them

Office (7.1 × 7.0 m, flat 2,700 mm acoustic-tile ceiling)

Meeting room (3.8 × 4.6 m, sloped exposed ceiling from 3,000 to 4,274 mm)

Lobby and shoes-off entry (현관)

Toilets

Boiler/electrical room and storage

Outdoor lighting

Rules for this site

Exterior fixtures and positions

Outdoor control

Controls and the hub (adds to E-102)

Power and energy

Still to confirm

Sources

Battery bank research: Goheung office (32 kWh LiFePO4)

The brief

The key finding: 32 kWh crosses Korea's 20 kWh line

Why 32 kWh will not fit in the planned room

Three ways forward

Does the office need 32 kWh? A rough sizing check

Battery bank specification (any option)

Chemistry and setup

Wiring and protection (for the electrician)

Physical

Certification (check before buying)

Control hub integration (E-102)

Placement

Option A: outdoor cabinet

Option C: up to 20 kWh indoors in the boiler/electrical room

Budget lines to add to E-102

Who to ask before deciding

Sources

Flooring research: Goheung office (shoes-off)

The brief

Recommendation

How each requirement applies to this building

1. Sound

2. Easy on the feet

3. Not cold

4. Easy to clean

The options compared

Products to look at (Korean makers)

Changes this means for the plan (A-602)

Notes for the installer

Cleaning routine

Still to confirm

Sources

The architectural sheets, updated for Rev.1

From the Rev.0 PDF

개요 · Project data 표지 · A-001

건축기준 반영 · How Rev.0 meets the brief A-001

면적표 · Areas A-001 · 벽체 중심선 기준

배치 가정 · Site assumptions A-001