Khalim Conn-Kowlessar bd193e06fc Slice S0380.146: Table 3 primary loss — Table 4b non-PCDB regular boilers with cylinder ... SAP 10.2 Table 3 (PDF p.160) "Primary circuit loss": "Primary circuit loss applies when hot water is heated by a heat generator (e.g. boiler) connected to a hot water storage vessel via insulated or uninsulated pipes (the primary pipework). Primary loss is set to zero for the following: Electric immersion heater Combi boiler ... CPSU ..." A Table 4b regular (non-combi, non-CPSU) gas or liquid-fuel boiler feeding a cylinder is in neither zero-loss list, so primary loss must apply. Pre-slice the Elmhurst-path fallback in `_primary_loss_applies` only covered PCDB Table 322 records (S0380.142) — when the cert lodges a Table 4b code (e.g. oil 1 sap_main_heating_code 127 "Condensing oil boiler") with no PCDB index and no `main_heating_category` lodgement, primary loss silently fell through to zero. This slice extends the Elmhurst-path fallback in `_primary_loss_applies` to fire when `sap_main_heating_code` is in the Table 4b code range (101-141) and NOT in the combi/CPSU sub-row exclusion set per Table 3: Combi codes: 103, 104, 107, 108, 112, 113, 118, 128, 129, 130 CPSU codes: 120, 121, 122, 123 Oil 1 worksheet (59)m daily rate = 1.3972 kWh/day uniform = 14 × [0.0245 × 3 + 0.0263] (uninsulated pipework, has cylinder thermostat + separately timed DHW → h=3 winter & summer per Table 3 split). Annual sum = 365 × 1.3972 ≈ 510 kWh/yr — matches the worksheet's (59) annual. Cascade impact on heating-systems corpus: - oil 1 SAP residual +2.66 → +1.76 (Δ -0.90) cost -£61.24 → -£40.60 (Δ +£20.64) CO2 -242.27 → -129.22 (Δ +113.05 kg/yr) PE -1050.49 → -590.02 (Δ +460.47 kWh/yr) Only the oil 1 variant moves — every other cascade-OK variant either already routes primary loss via the PCDB Table 322 branch (oil pcdb 1/ 2/3, pcdb 1) or via the boiler-category {1,2} branch. The other oil codes 124/125/126/131/132 + range-cooker codes 133-141 are gated for free by the same dispatch when their certs surface in future cohorts. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>		2026-05-31 22:20:50 +00:00
..
fixtures	Slice S0380.52: cert 000565 Elmhurst-only mapper-driven cascade pin + glazing-label coverage	2026-05-28 22:03:52 +00:00
__init__.py	Map to RdSapSiteNotes from site notes JSON 🟥	2026-04-16 13:54:03 +00:00
test_elmhurst_end_to_end.py	Slice S0380.17: map Elmhurst §11 glazing-type labels to SAP10 codes	2026-05-27 23:05:52 +00:00
test_elmhurst_extractor.py	extract window frame details from elmhurst site notes 🟥	2026-04-27 15:50:25 +00:00
test_end_to_end.py	P6.1 follow-on: unbox BuildingPartIdentifier at backend boundaries	2026-05-20 09:58:23 +00:00
test_extractor.py	Handle wall thickness "Unmeasurable" 🟩	2026-04-30 16:41:16 +00:00
test_heating_systems_corpus.py	Slice S0380.146: Table 3 primary loss — Table 4b non-PCDB regular boilers with cylinder	2026-05-31 22:20:50 +00:00
test_pdf.py	rename example site notes to PasHub_ and add Elmhurst example	2026-04-24 13:01:51 +00:00
test_summary_pdf_mapper_chain.py	Slice S0380.143: RdSAP 10 §10.11 Table 29 — derive cylinder insulation defaults from construction age band when §15.1 lodges "No Access"	2026-05-31 21:03:10 +00:00