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Cert 0380 (semi-detached bungalow ASHP) was the prior handover's "defer until HP go-ahead" pilot. Three slices this session closed the dwelling-shape part of the gap: - 101a: glazing_type=14 → DG/TG post-2022 (windows HLC exact) - 101b: cavity wall + filled cavity + external insulation (composite U via Table 14 R_ins + 2 d.p. round; walls HLC exact) + Table 11 cat-4 secondary fraction = 0 - 101c: Table 4f cat-4 pumps/fans kWh = 0 (37) total fabric heat loss is now EXACT vs worksheet 96.0889. Remaining gap (Δ +2.92 SAP) is dominated by the hot water cascade: the cert lodges a 160 L cylinder (storage loss + primary loss) and the HW HP COP is model-specific (PCDB index 104568 → 1.711 per worksheet, not the Table 4a generic 2.3 our cascade uses). Both require new cascade work — HP HW-specific COP from PCDB plus cylinder storage/primary loss application. Cert 0380's HW work will benefit all 6 sibling ASHPs sharing PCDB idx 104568 (and partially the 102421 outlier). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> |
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