Khalim Conn-Kowlessar c4a1045c8f Slice 102d: primary circuit loss via SAP 10.2 Table 3 with PCDB vessel gate ... SAP 10.2 §4 line 7700 + Table 3 (PDF p.159) define the primary circuit loss for cylinders heated indirectly through primary pipework: (59)m = n_m × 14 × [{0.0091 × p + 0.0245 × (1 − p)} × h + 0.0263] Inputs: p pipework insulation fraction — Table 3 rows: 0.0 uninsulated, 0.1 first 1 m, 0.3 all accessible, 1.0 fully insulated. RdSAP §3 default table (PDF p.56) supplies p by construction age band: bands A-J → 0.0, K, L, M → 1.0. h hours per day of primary circulation, winter / summer split: • no cylinder thermostat → 11 / 3 • thermostat, NOT separately timed → 5 / 3 • thermostat, separately timed → 3 / 3 ("Use summer value for June, July, August and September and winter value for other months" — spec p.159 footer.) Spec p.159 lists the zero-loss configurations: - electric immersion heater - combi boiler - CPSU - thermal store within single casing - separate boiler + thermal store within 1.5 m insulated pipe - direct-acting electric boiler - heat pump from PCDB with HW vessel integral to package The cohort gate is now PCDB-aware: HP main + PCDB Table 362 record `hw_vessel_mode != 1` (i.e. non-integral) → primary loss applies. All 7 cohort ASHPs lodge `hw_vessel_mode = 2` (separate and specified) per Table 362 records 104568 (Mitsubishi) and 102421 (Daikin). Cert 0380 (band D → p=0.0; cylinder thermostat + separately-timed → h=3 / 3) lands (59)Jan = 31 × 14 × (0.0245 × 3 + 0.0263) = 43.3132 kWh/month (test pinned at 1e-4 vs cert's dr87 worksheet). Cumulative cert 0380 API state: HW kWh/yr 431.4 → 653.1 (target 878, slice 102e closes via η_water) SAP 92.3 → 91.2 (delta to worksheet 88.51 now +2.73, was +3.75) Cohort regression: cert 0390-2954 (oil boiler + cylinder, age F → band A-J p=0.0) now picks up ~516 kWh/yr primary loss, tightening PE residual -27.50 → -26.01 and CO2 -2.66 → -2.52 (improvements). The higher HW fuel shifts SAP residual -6 → -7. Re-pinned with slice-102d note. Closed combi boiler certs (001479, 0330, 9501) unaffected: has_hot_water_cylinder=false gates the primary-loss override to None.		2026-05-27 12:14:05 +00:00
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addresses	get rid of comments	2026-05-20 13:21:11 +00:00
sap10_calculator	Slice 102d: primary circuit loss via SAP 10.2 Table 3 with PCDB vessel gate	2026-05-27 12:14:05 +00:00
sap10_ml	Slice 102b: cylinder storage loss via SAP 10.2 Tables 2/2a/2b	2026-05-27 11:42:01 +00:00
tasks	added postcode splitter rewrite to ddd	2026-05-19 16:35:09 +00:00
postcode.py	get rid of comments	2026-05-20 13:21:11 +00:00