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72ef0f0e7b
When a heat-pump cert lodges a PCDB Table 362 record, the APM override set BOTH the space efficiency (N3.6) and the water efficiency (N3.7a) from the heat pump unconditionally. But the PCDB η_water applies only when the DHW is heated BY the heat pump (water-heating code "from main": 901/902/914). A separate electric immersion (WHC 903) heats the water at 100% regardless of the space system, so applying the HP's water SCOP (187.5% × 0.6 in-use = 112.5%) under-counted the immersion's hot-water fuel. Gate the η_water override on the DHW-from-main codes; a separate immersion keeps its own 100% efficiency. Space η_space still always uses the APM value (the heat pump is the space main). Worksheet-validated to 1e-4 on simulated case 45 (HP space + WHC-903 immersion): water fuel (62) 1893.57 -> 2130.2639, total cost (255) 619.7433, CO2 692.13 — all matching the P960 exactly; SAP 60.53 -> rounds to the worksheet's 61. RdSAP-21.0.1 corpus unchanged (no HP+WHC903 certs in it). Pinned in test_cert_to_inputs (immersion fuel is main-independent). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| .. | ||
| addresses | ||
| billing | ||
| data_transformation | ||
| epc | ||
| epc_prediction | ||
| fuel_rates | ||
| geospatial | ||
| magicplan | ||
| modelling | ||
| property | ||
| property_baseline | ||
| sap10_calculator | ||
| sap10_ml | ||
| tasks | ||
| building_geometry.py | ||
| postcode.py | ||