Khalim Conn-Kowlessar 7b30b464e5 feat(ventilation): credit MVHR (24a) heat recovery via PCDB Table 323 + 329 ... MVHR (24a) heat-recovery support, part 2: the mapper + cascade wiring. Both source paths now resolve balanced whole-house MV with heat recovery to the MVHR kind: - gov-API: `_API_MECHANICAL_VENTILATION_TO_KIND` 4 → "MVHR" (was None / treated as natural — under-stated ventilation heat loss, over-rating). - Elmhurst Summary: `_ELMHURST_MV_TYPE_TO_KIND` "Mechanical ventilation with heat recovery (MVHR)" → "MVHR" (was UnmappedElmhurstLabel, which blocked the whole Summary for MVHR dwellings). cert_to_inputs resolves the in-use heat-recovery efficiency + SFP for an MVHR cert (`_mvhr_system_values`): pick the PCDB Table 323 data point by the lodged wet-room count (SAP 10.2 §2.6.4), multiply the raw efficiency by the Table 329 ducts-inside-envelope in-use factor (0.90) and the raw SFP by the per-duct-type factor (rigid 1.4), and feed: - the §2.6.6 eq (2) effective-air-change credit (23c) → (24a)/(25)m; - the (230a) fan electricity (in-use SFP × 1.22 × V), costed but NOT added to the Table 5a gains (its effect is in the efficiency). An MVHR lodged with no PCDF index falls back to the SAP 10.2 Table 4g default (raw efficiency 66% × 0.70, raw SFP 2.0 × 2.5). Worksheet-proven on simulated case 49 (000565 semi + Vent Axia Sentinel Kinetic B 500140 + gas combi → Elmhurst Current SAP 72): every MVHR line matches Elmhurst exactly — (33) fabric heat loss 100.5923, (23c) in-use efficiency 81.9% = 91 × 0.90, (25)m Jan 0.8571, (230a) fan electricity 415.9325, (231) total pumps/fans 501.9325. The residual SAP 71 vs 72 is the known 000565-family space-heating-demand artifact (same -1/-2 seen on cases 47/48), not the MVHR logic. Corpus: within-0.5 72.6% -> 72.7%, MAE 0.788 -> 0.782, PE 3.6 -> 3.5. The 3 gov-API MVHR certs: Flat 1 +6 -> 0 (Table 4g default path) and 12a Princes Gate +3 -> +1 (heat-recovery credit); Apartment 707 -4 -> -6 is a separate baseline under-rate (it under-rated as natural too — the MVHR credit correctly adds ventilation loss per Elmhurst's method). Ratcheted _MAX_SAP_MAE 0.79 -> 0.785, _MAX_PE_PER_M2_MAE 3.7 -> 3.6. Note: pyright strict type gate not run locally (pyright not installed). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>		2026-06-23 19:45:37 +00:00
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epc	feat(ventilation): credit MVHR (24a) heat recovery via PCDB Table 323 + 329	2026-06-23 19:45:37 +00:00
__init__.py	further breaking up code	2023-07-20 12:24:34 +01:00
datatypes.py	further breaking up code	2023-07-20 12:24:34 +01:00
enums.py	completed build of new demo portfolio - some fixed required still	2023-11-20 14:42:16 +00:00