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Model/domain/sap10_calculator/rdsap
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Khalim Conn-Kowlessar dbaf3c49e2 fix(hp): floor heat-pump water-heating efficiency at 100% (App N3.7) 🟩 
_heat_pump_apm_efficiencies applied the Table N8 in-use factor to the PCDB
water-heating efficiency but omitted the spec's "subject to a minimum
efficiency of 100%" clause (SAP 10.2 Appendix N3.7, PDF p.109). An oversized
heat pump whose PSR-extended water,3 x the 0.60 in-use factor fell below
100% therefore billed water heating at that sub-100% efficiency, over-
counting hot-water fuel.

Apply max(in_use x eta_water, 100%). Accredited Elmhurst worksheet for cert
100110101713 (golden fixture case 56, PCDB 100061): water (216) = 100.0000,
which we now match (was 77.13%). Combined with the space-heating PSR-
extension fix the cert lands 72.51 vs lodged 73 (|err| 18.32 -> 0.49).

Data-driven: only the single oversized-PSR cert moves (in-range heat pumps
keep their > 100% water COP, e.g. case 54 112.5%, case 55 179.6%). Corpus
(RdSAP-21.0.1 n=1000) MAE 0.726 -> 0.721, within-0.5 74.1% -> 74.2%.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-29 15:38:31 +00:00
..
__init__.py refactor: lift-and-shift packages/domain/src/domain/sap → domain/sap10_calculator 2026-05-26 12:22:37 +00:00
cert_to_inputs.py fix(hp): floor heat-pump water-heating efficiency at 100% (App N3.7) 🟩 2026-06-29 15:38:31 +00:00