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51d8f65aac
interpolate_heat_pump_efficiency_at_psr clamped to the smallest/largest PSR row when the dwelling's plant size ratio fell outside the record's range. That is the SAP 10.2 Appendix N rule for *combined heat-pump-and-boiler* packages, not for a plain air/ground/water source heat pump. Per Appendix N2 (PDF p.101, footnotes 44/45) a source heat pump whose PSR exceeds the record's largest value takes a reciprocal-linear interpolation between the largest-PSR efficiency and 100% at twice that PSR (100% beyond), and 100% when the PSR is below the record's smallest value. Both the space- and water-heating PSR-dependent efficiencies extend this way. Effect: an oversized heat pump in a small dwelling is no longer credited the full top-of-table COP. Accredited Elmhurst worksheet for cert 100110101713 (golden fixture case 56, PCDB 100061, PSR 3.107 over largest 2.0): (206) 334.4% -> 139.66% = Elmhurst exact. Corpus (RdSAP-21.0.1, n=1000) MAE 0.7397 -> 0.7258, within-0.5 0.7410 held; only two certs move (both oversized-PSR heat pumps), 100110101713 +18.32 -> -4.97. Exhaust-air and combined heat-pump-and-boiler packages have different boundary rules (straight-to-100% / clamp-to-edge) but are not distinguished by the current PCDB parse; the air/ground/water rule is applied uniformly, a documented limitation noted in the function docstring. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| data | ||
| __init__.py | ||
| etl.py | ||
| parser.py | ||
| postcode_weather.py | ||