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SAP 10.2 Appendix N3.5 + Table N5 (PDF p.107) — for heat pumps with "Variable" daily heating duration, the annual N24,9 and N16,9 totals (days operating at 24h or 16h instead of the standard 9h) are obtained by linear interpolation between Table N5 rows at the dwelling's plant size ratio, rounded to the nearest whole number of days. Clamps to the table bounds (PSR ≤ 0.2 → first row; PSR ≥ 1.2 → last row) per the same convention applied to PSR efficiency lookup in Appendix N (PDF p.101 lines 6007-6008). Cohort sanity: cert 0380's PSR ≈ 1.43 → (3, 38) per the last-row clamp; worksheet shows Jan N24,9=3 + Jan/Dec N16,9=28+10=38 — exact match to Table N5 row "1.2 or more". Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com> |
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