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test(accuracy): ratchet SAP MAE 0.740 -> 0.726 after HP PSR-extension 🟪

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The heat-pump PSR-extension fix (SAP 10.2 Appendix N2) drops corpus MAE from
0.740 to 0.726 on the 1000-cert RdSAP-21.0.1 sample; within-0.5 holds at
74.1%. Tighten the ceiling and log the slice.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar 2026-06-29 15:16:07 +00:00
parent 51d8f65aac
commit 2d6479536c
1 changed files with 10 additions and 1 deletions
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11
tests/infrastructure/epc_client/test_sap_accuracy_corpus.py
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@ -248,7 +248,16 @@ _MIN_WITHIN_HALF_SAP = 0.74
# an identical dwelling rates SAP 87 with "Connected to Dwelling = Yes" (credit
# -£167) vs SAP 74 with "No" (credit £0). Enum decoded empirically: 0 = no PV,
# 1 = not connected, 2 = connected (the gov-API does not expose it elsewhere).
_MAX_SAP_MAE = 0.740
# Then 0.740 -> 0.726 via the heat-pump PSR-extension fix (SAP 10.2 Appendix N2,
# PDF p.101 footnotes 44/45): an air/ground/water source heat pump whose plant
# size ratio exceeds the PCDB record's largest PSR is no longer clamped to the
# top-of-table COP — its efficiency is reciprocal-interpolated toward 100% at
# twice the largest PSR (and 100% below the smallest PSR). 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. Only two
# certs move (both oversized-PSR heat pumps): 100110101713 +18.32 -> -4.97 and
# 4510053280 -0.61; within-0.5 holds at 74.1%.
_MAX_SAP_MAE = 0.726
_MAX_CO2_MAE_TONNES = 0.09 # t CO2 / yr vs co2_emissions_current
_MAX_PE_PER_M2_MAE = 3.5 # kWh / m2 / yr vs energy_consumption_current