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dbaf3c49e2
_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> |
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| .. | ||
| addresses | ||
| billing | ||
| data_transformation | ||
| elmhurst | ||
| epc | ||
| epc_prediction | ||
| fuel_rates | ||
| geospatial | ||
| magicplan | ||
| modelling | ||
| property | ||
| property_baseline | ||
| sap10_calculator | ||
| sap10_ml | ||
| tasks | ||
| building_geometry.py | ||
| postcode.py | ||