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docs: Thread 2 unblocked — case 14 (code-301 boiler+gas) arbitrates 9390

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Record the community mains-gas BOILER worksheet (case 14): target (386)
heat-network CO2 factor 0.2640, distribution loss 1.49, code 301. 9390
decomposition: PE matches (204 vs 205), CO2 6.5x low (collision), SAP +4
separate cost gap.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Khalim Conn-Kowlessar 2026-06-03 23:07:05 +00:00
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23
domain/sap10_calculator/docs/HANDOVER_MAPPER_BUGS.md
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@ -11,8 +11,8 @@ API-mapper/cascade bugs the audit surfaced.
ALSO run `domain/sap10_ml/tests/` when touching `rdsap_uvalues.py` — 2 PRE-EXISTING
stone-formula failures there, see Thread 1.
- **Next slice number:** **S0380.212**.
- **Open:** Thread 2 (community 9390) — needs a **code-301 boiler + mains-gas** worksheet
(case 13 is code-302 CHP-gas, close but not 9390's scheme). Threads 1 + 3 **CLOSED**.
- **Open:** Thread 2 (community 9390) — UNBLOCKED: **case 14** (code-301 boiler + mains
gas) is on disk, target `(386)` heat-network CO2 = 0.2640. Threads 1 + 3 **CLOSED**.
---
@ -100,11 +100,22 @@ formula 3.7408 vs Table-6 1.7 cap, granite + sandstone band A) — they fail at
---
## OPEN THREAD 2 — Community fuel-code collision (cert 9390), needs a **9390 worksheet**
## OPEN THREAD 2 — Community fuel-code collision (cert 9390) — UNBLOCKED, **case 14 in hand**
Cert **9390-2722-3520**: SAP +4 (calc 71 / lodged 67), PE ≈ matches (204 vs 205), but
**CO2 0.44 t vs lodged 2.8 t**. Community scheme (`sap_main_heating_code=301`,
`main_fuel_type=20`).
Cert **9390-2722-3520** (TFA 75.17): SAP +4 (calc 71 / lodged 67), PE ≈ matches
(204 vs 205), but **CO2 5.86 kg/m² vs lodged 38** (0.44 t vs 2.8 t — 6.5× low).
Community scheme (`sap_main_heating_code=301`, `main_fuel_type=20`).
**Arbitrating worksheet (case 14, `simulated case 14/`):** community **Boilers**
(`(303a)`=1.0, no CHP) + **Mains Gas** + **SAP code 301** — 9390's exact scheme.
Key targets: `(386)` **Overall heat-network CO2 factor = 0.2640**, `(306)`
distribution loss factor (Table 12c) = **1.49**, `(385)` EI rating 69. So a
community mains-gas BOILER scheme should drive CO2 at the heat-network factor
**0.2640** (≈ base mains-gas 0.210 × 1.257 source/loss scaling), NOT the biomass
0.028 the collision currently returns. **API `main_fuel_type=20` = community mains
gas → Table 12 code 51** (base CO2 0.210, PEF 1.130). Cases 12 (CHP coal, 302) +
13 (CHP gas, 302) also on disk — useful for the CHP `(303a/303b)` split but NOT
9390's boiler scheme.
**Root cause:** `co2_factor_kg_per_kwh` / `unit_price_p_per_kwh` /
`primary_energy_factor` in `tables/table_12.py` + `table_32.py` use an