Model/datatypes
Khalim Conn-Kowlessar dfe2f2ce6e Slice 102f-prep.8: API mapper resolves shower_outlets=None → 0 mixers
Cert 2225 (Mitsubishi PUZ-WM50VHA, semi-detached 2-bp, TFA 82.49)
lodges `sap_heating.shower_outlets = None` in the Open EPC API
JSON. The worksheet (42a) "Hot water usage for mixer showers" reads
0 every month — Elmhurst's convention is "absent ⇒ no shower".

Pre-fix the API mapper returned `mixer_shower_count = None`,
deferring to the cert→inputs cascade's "RdSAP modal lodging"
default of 1 vented mixer. That added ~7 L/day to (44) daily HW
use, ~113 kWh/yr to (62) HW demand, and shifted cert 2225's SAP
residual from -0.31 → +0.04 (now aligned with the cohort's
+0.03..+0.06 cluster) once the mapper returns 0.

`_count_shower_outlets_by_type` now treats None as 0 (the API
mapper-only path). The cert→inputs cascade's
`_mixer_shower_flow_rates_from_cert` keeps the None→1 default for
the Elmhurst hand-built fixture path that doesn't route through
this helper.

Cohort impact: 6 of 7 ASHP certs now cluster at SAP Δ +0.03 to
+0.06 (vs worksheet); only cert 2636 remains an outlier (+0.49).
Golden cert PE/CO2 pins re-pinned for 6035, 8135, 0390 (the three
certs that previously lodged shower_outlets=None and consumed the
spurious 1-mixer default).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-06-01 16:28:46 +00:00
..
epc Slice 102f-prep.8: API mapper resolves shower_outlets=None → 0 mixers 2026-06-01 16:28:46 +00:00
magicplan typing and renaming 🟪 2026-05-07 13:26:49 +00:00
__init__.py further breaking up code 2023-07-20 12:24:34 +01:00
datatypes.py further breaking up code 2023-07-20 12:24:34 +01:00
enums.py completed build of new demo portfolio - some fixed required still 2023-11-20 14:42:16 +00:00