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04be37075d
Closes the "no system" corpus variant fully (ΔSAP +1.18 → <1e-4 on all four metrics). The cert lodges §15.0 "Water Heating Code: NON / SapCode 999" and §15.1 "Hot Water Cylinder Present: No". Per RdSAP 10 §10.7 (PDF p.55) "No water heating system" verbatim: "the calculation is done for an electric immersion heater. If the electric meter is dual the immersion heater is also dual, but is a single immersion otherwise... for a cylinder defined by the first row of Table 28 (110 litres) and the first row of Table 29." Table 29 row 1 gives age-band cylinder insulation (age G -> 25 mm foam) and assumes a cylinder thermostat present for immersion-heated DHW. The BRE-approved Elmhurst engine confirms the substitution: the P960 worksheet header lodges "WHS: 903 Electric immersion, Single", a 110 L cylinder, and storage loss (56) = 594.32 kWh/yr, so HW (64) = (45) 1935.37 + 594.32 = 2529.6927. Pre-slice the cascade trusted the lodged "no cylinder" -> added no storage loss and a spurious Table 3a keep-hot combi loss; the wrong HW heat-gains also propagated through §5/§7, over-stating the base MIT by +0.25 K and space fuel by +228 kWh. New `_apply_rdsap_no_water_heating_system_default(epc)` rebinds the epc at the top of cert_to_inputs (the demand cascade delegates here too) when water_heating_code == 999, injecting WHC 903 + electricity fuel + 110 L cylinder + Table 29 insulation + assumed cylinder thermostat. This closes HW fuel AND the downstream space residual in one move. Age bands A-F (12 mm loose jacket) raise UnmappedSapCode — no corpus member exercises that and the Table 2 loss-factor dispatch only has the factory-foam path plumbed. Gate is keyed on code 999, unique to "no system" in the corpus; 40 other variants + 858 section pins + 6 U985 fixtures unchanged. 936 pass; pyright net-zero 32 -> 32. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| .. | ||
| addresses | ||
| data_transformation | ||
| epc | ||
| geospatial | ||
| property | ||
| property_baseline | ||
| sap10_calculator | ||
| sap10_ml | ||
| tasks | ||
| postcode.py | ||