Steam and cooling plant for the five-press fleet; utilities re-based

New page docs/steam-cooling.html (site /demos/steam-cooling/): the
utility plant as a clickable process diagram. Steam side: raw water,
softener and dosing, feed tank with heat-pump feedwater recovery, feed
pumps, a bank of two 500 kg/h boilers (third for N+1 as an option),
separator and metering, optional accumulator, blowdown, the 10 bar
header with a valved, metered branch and trap per press, drip legs and
condensate return. Cooling side: Newbilt's press outlets are open (max.
2 bar), so returns drain to a warm tank, pass the heat pump, an optional
dry cooler and a plate heat exchanger to a cold buffer tank, and VFD
pumps feed the 20 to 25 C header at ~10 bar to every press, the
extruders and the central hydraulic oil cooler; the chiller loop
(three 250 kW air-cooled modules at 40 C ambient, fourth as option) stays
closed and clean. Galvanics cooling (12 to 20 C) is a separate circuit.
Operating cases (launch, Duplex system 1, five presses, one module down)
show demand against installed capacity; design basis with sources,
equipment schedule, RFQ questions. Static SVG, no per-frame work.

Design basis at Newbilt's per-machine figures: steam 750 to 900 kg/h,
cooling 652.5 kW (625 presses, 15 extruders, 12.5 hydraulics), 305 to
540 l/min circulating. Also found: Newbilt's 53 l/min at ~60 C out is
~140 kW, above its 125 kW peak; listed as a re-quote question.

Re-based in the same commit:
- scale.md: electrical table (chiller bank ~210 to 325 kW electrical,
  plant peak ~430 to 700 kW, ~950 to 1,330 kW with electric steam),
  grid 800 to 1,000 kVA (1,250 to 1,600 with electric steam, Schedule
  4 past 1,000 kW), tariff 4.5M to 6.8M THB/yr, battery ~1 h of chiller
  peak, boiler and chiller banks, biomass up to ~550 t/yr at 1.5 M
  records, utilities money line.
- sustainability.md, biomass.md: same figures; electric steam 5.2M to
  6.0M THB/yr mature, 1.6M to 1.8M early; fuel saving 4.0M to 5.4M.
- utilities CSV: boiler bank, chiller bank with HX and tanks, softener
  and loop treatment re-sized; baseline 23.98M-41.63M -> 30.07M-51.33M.
- total-investment.md: re-size as an added-scope row (+185k / +294k
  USD); headline 4.7M to 8.9M unchanged until the investment re-base.
- pressing-line, equipment-suppliers, facility-security, fleet
  calculator (boiler 1000 kg/h, chiller 750 kW), plant page detail
  texts; README, landing page, build.sh.

docs/scale.md

@@ -174,34 +174,36 @@ conversion, which forestry land generally does not.
 
 | Load | Rough figure |
 |---|---|
-| Pressing machinery (two Duplex systems + the Classic) | ~90 to 120 kW installed (estimate: 32 kVA per Duplex system by Newbilt's requirements; the second extruders and the Classic not yet published) |
-| Process chiller (250 kW cooling) | ~80 to 125 kW electrical |
+| Pressing machinery (two Duplex systems + the Classic, central hydraulics) | ~118 kVA connected, ~73 kW average while running (Newbilt per-machine figures; the EX 35 and the Classic counted like the EX 50 and an HRP 12 until published) |
+| Chiller bank (up to ~650 kW cooling) | ~210 to 325 kW electrical at the peak (~80 to 125 kW per 250 kW of cooling, air-cooled, hot season; estimate) |
 | Whole-factory HVAC | ~100 to 200 kW peak (estimate) |
-| Electric steam boiler (if chosen over biomass/LPG) | ~300 kW |
+| Electric steam boiler bank (if chosen over biomass/LPG) | ~520 to 625 kW for 750 to 900 kg/h |
 | Compressed air, lighting, IT, misc | ~30 to 50 kW |
-| **Plant peak demand** | **~300 to 450 kW without electric boiler; ~600 to 750 kW with it** |
+| **Plant peak demand** | **~430 to 700 kW without electric boiler; ~950 to 1,330 kW with it** |
 
-Grid connection: a medium-voltage connection with a transformer in the
-**500 to 1,000 kVA** class from PEA, sized by the boiler decision.
+Grid connection: a medium-voltage connection from PEA with a transformer in
+the **800 to 1,000 kVA** class without electric steam, **1,250 to 1,600 kVA**
+with it; past 1,000 kW of demand the plant moves to PEA Schedule 4, whose
+time-of-use rates are the same.
 
-**Not yet re-based for the five-press fleet** (October 2026). The chiller
-and peak rows above are sized for one Duplex's ~250 kW of cooling; at
-Newbilt's up to 125 kW of cooling per press, five presses need up to ~625
-kW, so the chiller's electrical draw and the plant peak rise accordingly.
-Re-size with the Newbilt re-quote figures, together with the steam below
-([pressing line](equipment/pressing-line.md)). The presses share one
-central hydraulic plant and one compressed-air plant; their draw replaces
-the per-system hydraulic units in the pressing row above. The optional
-ten more Classics would need up to ~1.9 MW of cooling and ~2.3 to 2.7 t/h
-of steam: a utility phase of its own.
+**Re-based for the five-press fleet** (October 2026; the concept is drawn
+in [steam and cooling](steam-cooling.html)). At Newbilt's per-machine
+figures the two Duplex systems and the Classic need 750 to 900 kg/h of
+steam and up to ~650 kW of cooling (625 kW presses, 15 kW extruders, 12.5
+kW hydraulic oil cooler) at 305 to 540 l/min of circulating water. The
+peak rows assume all five presses cooling hard on a hot afternoon; the
+Classic counts as one HRP 12 press plus one extruder until Newbilt states
+its figures. The presses share one central hydraulic plant and one
+compressed-air plant. The optional ten more Classics would need up to ~1.9
+MW of cooling and ~2.3 to 2.7 t/h of steam: a utility phase of its own.
 
 Tariff: PEA Schedule 3.2.2, Medium General Service on time of use at
 22 kV (the flat rate is closed to new customers): 132.93 THB/kW demand
 charge on the peak-hour maximum, 4.1839 THB/kWh peak (09:00 to 22:00 on
 weekdays) and 2.6037 THB/kWh off-peak, plus Ft (0.1623 THB/kWh for
 September to December 2026) and VAT. Two-shift production lands at a
-blended ~3.81 THB/kWh before the demand charge, roughly 4.3M to 6.4M THB a
-year without electric steam (estimate); the deposit for the connection is
+blended ~3.81 THB/kWh before the demand charge, roughly 4.5M to 6.8M THB a
+year without electric steam, 0.7M to 1.1M of it demand charge (estimate); the deposit for the connection is
 400 THB per kVA. Detail and what it decides for steam, PV and the battery
 in [sustainability](sustainability.md#grid-tariff-pea-and-what-it-decides).
 
@@ -225,19 +227,28 @@ small against the connection, but its own feeder and meter.
   without electric steam, falling to **~17%** with it; a bigger array
   shifts that up
 - Battery: **271 kWh** Gobel stack (ride-through, roughly
-  two to three hours of the chiller's electrical draw; peak shaving earns
+  an hour of the chiller bank's peak electrical draw; peak shaving earns
   little under PEA's time-of-use tariff, see
   [sustainability](sustainability.md#grid-tariff-pea-and-what-it-decides))
 
 ## Steam and fuel
 
-- Boiler: **400 kg/h at 10 bar / 180 °C** (~300 kW thermal), sized for
-  one Duplex. The current five-press fleet draws **~750 to 900 kg/h** at
-  Newbilt's 150 to 180 kg/h per press: not yet re-based, and the fuel
-  figures below scale with it
-- If biomass: **~350 to 400 t/yr** air-dry wood at mature operation, of
-  which the 60 rai coppice could supply **~80 to 135 t/yr**
-- If LPG: **~2.5 to 5 t** bulk tank on site (no gas pipeline in the North)
+- Boiler bank: the five-press fleet draws **~750 to 900 kg/h at 10 bar /
+  180 °C** (~510 to 610 kW thermal) at Newbilt's 150 to 180 kg/h per press.
+  Proposed: **two 500 kg/h modules** (B-1 with the launch press and Duplex
+  system 1, B-2 with system 2 and the Classic), 1,000 kg/h installed; a
+  third module for N+1 is an RFQ option
+  ([steam and cooling](steam-cooling.html)). The 2024 Newbilt quote's
+  ~400 kg/h covers one Duplex system
+- Chiller bank: up to **~650 kW** of cooling; proposed **three 250 kW
+  air-cooled modules** rated at 40 °C ambient, one per press stage, behind a
+  plate heat exchanger with warm and cold tanks (estimate)
+- If biomass: **~350 to 400 t/yr** air-dry wood at ~1.0 to 1.1 million
+  records a year, up to **~550 t/yr** at the start fleet's full ~1.5
+  million (fuel follows records pressed, not presses installed); the 60 rai
+  coppice could supply **~80 to 135 t/yr**
+- If LPG: a bulk tank on site sized with the boiler bank (the ~2.5 to 5 t
+  first estimated was for one Duplex; no gas pipeline in the North)
 
 ## People
 
@@ -258,8 +269,8 @@ keep their original currency alongside.
 - Newbilt semi-auto line: **~USD 232k (~7.7M THB)**, from the June 2024
   quote of EUR 200,500 — expired, in
   [pressing-line](equipment/pressing-line.md)
-- Thai-sourced utilities, HVAC, racking, solar, BESS baseline: **~24M to
-  42M THB (~USD 730k to 1.27M)**, detail in the
+- Thai-sourced utilities, HVAC, racking, solar, BESS baseline: **~30M to
+  51M THB (~USD 910k to 1.56M)** for the five-press fleet, detail in the
   [utilities CSV](finance/utilities-investment.csv)
 - Not yet priced: the second Duplex system and the Newbilt Classic
   (estimates in [total investment](finance/total-investment.md)),