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SAP 10.2 Appendix K eqn (K2) p.84:
HTB = y × Σ(Aexp)
where Aexp is "the total area of external elements calculated at
worksheet (31)". The worksheet (31) column header reads "Total NET
area of external elements" — net of openings.
Cert 2636 (dr87-0001-000898 line 187): (31) = 160.33 m² =
47.70 main net + 11.57 alt net + 42.92 roof + 39.18 ground floor
+ 3.74 cantilever + 11.52 windows + 3.70 doors.
Pre-fix cascade summed the alt-wall at its 12.76 m² gross (no
opening deduction) — (31) was 161.52, driving (36) to 24.228 vs
worksheet 24.0495 (Δ +0.1785 W/K). That drift propagated through
(39) HTC → MIT → space heating, leaving cert 2636 at Δ -0.015
SAP — the only ASHP cohort cert above the 1e-4 floor.
`alt_walls_total_area` aggregates per-alt-wall gross at line 736;
this slice subtracts `alt_window_area` from it in the (31) sum so
the alt-wall contribution is net, matching the (29a) net-area
convention already applied per-element to the A×U sums.
Cohort-1 ASHP cohort: 9/9 certs < 1e-4 Summary path (was 8/9 with
cert 2636 at -0.015). Cert 2636 API path also closes to < 1e-4 —
the bug was path-symmetric in the cascade, not in either mapper.
Cohort-2 unchanged at 33 exact + 5 ≤0.07.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| elmhurst_extractor.py | ||
| extractor.py | ||
| local_runner.py | ||
| parser.py | ||
| pdf.py | ||