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docs: session-8b handover — MEV fan electricity (PCDB index plumbed)

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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Khalim Conn-Kowlessar 2026-06-08 23:17:17 +00:00
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docs/HANDOVER_API_PROFILING.md
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@ -13,16 +13,29 @@ deproven approaches + the meter/shower data-fidelity findings), and the earlier
`energy_rating_current`. Headline gauge:
`PYTHONPATH=/workspaces/model python scripts/eval_api_sap_accuracy.py`.
| metric | session-5 (`19235d11`) | session-6 (`a7761ea8`) | session-7 (`3e05c95e`) | **session-8 (`71b378b9`)** |
| metric | session-6 (`a7761ea8`) | session-7 (`3e05c95e`) | session-8 (`71b378b9`) | **session-8b (`e7af6fda`)** |
|--------|------------------|------------------|------------------|------------------|
| **% \|err\| < 0.5** | 53.1% | 53.14% | 54.24% | **55.01%** |
| % \|err\| < 1.0 | 68.0% | 67.99% | 69.64% | **70.08%** |
| % \|err\| < 2.0 | ~81% | 81.85% | 83.50% | **~83.6%** |
| mean \|err\| | 1.329 | 1.312 | 1.248 | **1.233** |
| median \|err\| | 0.467 | 0.467 | 0.457 | **0.448** |
| **% \|err\| < 0.5** | 53.14% | 54.24% | 55.01% | **55.12%** |
| % \|err\| < 1.0 | 67.99% | 69.64% | 70.08% | **70.08%** |
| % \|err\| < 2.0 | 81.85% | 83.50% | ~83.6% | **~83.6%** |
| mean \|err\| | 1.312 | 1.248 | 1.233 | **1.232** |
| median \|err\| | 0.467 | 0.457 | 0.448 | **0.446** |
| computed / raises | 909 / 0 | 909 / 0 | 909 / 0 | **909 / 0** |
| unsupported_schema | 100 (deferred) | 100 (deferred) | 100 (deferred) | 100 (deferred) |
### SESSION-8b — MEV fan electricity (PCDB index plumbed), `e7af6fda`
Follow-up to 8: the +0.9 residual on MEV after the §2 heat-loss fix was the FAN
electricity (§5 Table 4f (230a) `SFPav × 1.22 × V`, PCDB Tables 322/329).
`_mev_decentralised_kwh_per_yr_from_cert` already composes it but reads
`epc.mechanical_ventilation_index_number` + `mechanical_vent_duct_type`, which the
API builder never set → `pcdf_id is None` zeroed the fan energy on every API cert.
Wired both through the 21.0.1 construction. The 9 MEV certs with a PCDB index
closed +0.90 → +0.13; the **11 index-less MEV certs still sit at +1.36** — they
need the SAP Table 4h DEFAULT specific fan power (no PCDB record), a clean next
slice (verify the default SFP value against spec first). New e2e test + golden
fixture (cert 1300, dMEV index 500777). NB the 21.0.0 API builder didn't get the
8/8b ventilation edits (only 21.0.1, the corpus schema).
### SESSION-8 — API `mechanical_ventilation` enum never mapped, `71b378b9`
Re-profiling after the sheltering fix surfaced `mechanical_ventilation=2` as a
clean systematic over-rate (n=20, signed +1.90, 5% within 0.5, every cert