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Slice S0380.50: §4 seasonal monthly HW fuel for PV β cascade
The PV β-factor cascade was prorating the annual hot-water fuel kWh uniformly by days when feeding D_PV,m per Appendix M1 footnote 32. The worksheet uses §4 (219)m = (62)m / efficiency monthly — which is seasonal (peaks in Jan when cold-mains-inlet drives energy content, troughs in Jul/Aug). For cert 0380: worksheet Jul (219) = 68.30 kWh vs cascade days-prorated 74.60 kWh — over-counted summer D_PV by ~6 kWh/month. Per Appendix M1 footnote 32: "D_PV,m = ... + E_water,m" where "E_water,m = (219)_m if water heating fuel code applied in Section 10a of the SAP worksheet is 30". (219)_m is the §4 fuel kWh per month, not annual / 12. Fix: scale `wh_result.output_monthly_kwh` to sum to the annual fuel `hw_kwh` (equivalent to dividing each month by the annual-average efficiency — exact for single-COP HP water heaters; close enough for PCDB combi winter/summer-split efficiencies because the annual total already accounts for the seasonal-efficiency mix). None fall- back to the legacy days-proration when wh_result is absent (TFA-missing certs). Cohort PE residual closure (kWh/m²): | Cert | Post-S0380.49 | Post-S0380.50 | |---|---:|---:| | 0350 | -2.96 | **-2.90** | | 0380 | -3.06 | **-2.96** | | 2225 | -3.73 | **-3.54** | | 2636 | -3.44 | **-3.28** | | 3800 | -3.25 | **-3.16** | | 9285 | -2.81 | **-2.74** | | 9418 | -3.01 | **-2.89** | Modest but real cohort closure (~0.1 kWh/m² each). The remaining ~3 kWh/m² traces to a small cascade β over-count (0.751 vs worksheet 0.739) — likely Appendix L monthly-weighting details for appliances/ cooking/electric-shower in D_PV; deferred to a follow-up slice. Cert 9501 (PV no battery) unchanged at +0.65 PE. CO2 cohort: <0.11 t/yr (within tolerance, re-pinned in same slice). SAP scores all exact. 763 pass + 0 fail. Pyright net-zero.
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Khalim Conn-Kowlessar
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33edff136a
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3d1e6f103a
2 changed files with 58 additions and 35 deletions
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@ -3128,6 +3128,28 @@ def cert_to_inputs(
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# = electricity → Table 12 code 30) per the Appendix M1 §3a fuel
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# inclusion list.
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pv_monthly_kwh = _pv_monthly_generation_kwh(epc, climate)
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# SAP 10.2 Appendix M1 footnote 32 D_PV,m uses §4 (219)m monthly
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# water-heating fuel kWh — which is the (62)m output divided by the
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# water-heater efficiency. Uniform days-proration over the annual
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# `hw_kwh` over-counts D_PV in summer and under-counts in winter
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# (the (45)m hot-water energy content is seasonal, peaking in Jan).
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# Scale `wh_output_monthly_kwh` to sum to the annual fuel `hw_kwh`
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# — equivalent to dividing each month by the annual-average
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# efficiency, which matches the worksheet's (219)m for HP / single-
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# efficiency water heaters. For PCDB combis with distinct winter /
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# summer efficiencies, `_apply_water_efficiency` already accounted
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# for the seasonal split in the annual total; preserving the §4
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# monthly shape here keeps the per-month distribution faithful.
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if wh_result is not None and sum(wh_result.output_monthly_kwh) > 0:
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output_total = sum(wh_result.output_monthly_kwh)
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hot_water_monthly_kwh_for_pv = tuple(
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wh_result.output_monthly_kwh[m] / output_total * hw_kwh
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for m in range(12)
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)
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else:
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hot_water_monthly_kwh_for_pv = _days_in_month_proportioned(
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hw_kwh, _DAYS_IN_MONTH,
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)
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pv_eligible_demand_monthly_kwh = _pv_eligible_demand_monthly_kwh(
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lighting_monthly_kwh=lighting_monthly_kwh,
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appliances_monthly_kwh=appliances_monthly_kwh,
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@ -3140,7 +3162,7 @@ def cert_to_inputs(
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pumps_fans_kwh, _DAYS_IN_MONTH,
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),
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main_1_fuel_monthly_kwh=energy_requirements_result.main_1_fuel_monthly_kwh,
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hot_water_monthly_kwh=_days_in_month_proportioned(hw_kwh, _DAYS_IN_MONTH),
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hot_water_monthly_kwh=hot_water_monthly_kwh_for_pv,
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main_fuel_code_table_12=(
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API_FUEL_TO_TABLE_12.get(main_fuel, main_fuel)
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if main_fuel is not None else None
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@ -257,93 +257,94 @@ _EXPECTATIONS: tuple[_GoldenExpectation, ...] = (
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cert_number="0380-2471-3250-2596-8761",
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actual_sap=89,
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expected_sap_resid=+0,
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expected_pe_resid_kwh_per_m2=-3.0557,
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expected_co2_resid_tonnes_per_yr=-0.0549,
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expected_pe_resid_kwh_per_m2=-2.9633,
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expected_co2_resid_tonnes_per_yr=-0.0548,
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notes=(
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"Mitsubishi PUZ-WM50VHA PCDB 104568, semi-detached bungalow "
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"TFA 60.43 age D, PV 3 kWp + 5 kWh battery. Worksheet SAP "
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"88.5104. Slice S0380.48 surfaced the 5-kWh battery from "
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"the flat-shape real-API JSON (PE +8.09 → -4.01). Slice "
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"S0380.49 then wired effective-monthly Table 12e PE factor "
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"into the PV split — dwelling 1.4952 (vs worksheet 1.4960), "
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"exported 0.4283 (vs worksheet 0.4268) — closing PE -4.01 "
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"→ -3.06. The residual -3 traces to a small β fine-tuning "
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"gap (cascade 0.751 vs worksheet 0.7426) — monthly D_PV "
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"distribution detail."
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"88.5104. Slice S0380.48 surfaced the 5-kWh battery (PE "
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"+8.09 → -4.01); .49 wired Table 12e effective-monthly PE "
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"factor (PE -4.01 → -3.06); Slice S0380.50 replaced "
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"days-prorated hot-water demand in the PV β cascade with "
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"the §4 (62)m seasonal output scaled to annual fuel (PE "
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"-3.06 → -2.96). Remaining ~3 kWh/m² traces to a small "
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"cascade β over-count (0.751 vs worksheet 0.739) — "
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"monthly D_PV distribution for appliances/cooking/electric-"
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"shower likely needs Appendix L-aligned monthly weights."
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),
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),
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_GoldenExpectation(
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cert_number="0350-2968-2650-2796-5255",
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actual_sap=84,
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expected_sap_resid=+0,
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expected_pe_resid_kwh_per_m2=-2.9642,
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expected_co2_resid_tonnes_per_yr=-0.0865,
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expected_pe_resid_kwh_per_m2=-2.8973,
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expected_co2_resid_tonnes_per_yr=-0.0864,
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notes=(
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"Mitsubishi PUZ-WM50VHA PCDB 104568, ASHP cohort cert with "
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"PV + 5 kWh battery. Worksheet SAP 84.1367. Slice S0380.49 "
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"Table 12e PE factor wiring closed PE -3.58 → -2.96."
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"PV + 5 kWh battery. Worksheet SAP 84.1367. Slice S0380.50 "
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"HW seasonal-monthly fix closed PE -2.96 → -2.90."
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),
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),
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_GoldenExpectation(
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cert_number="2225-3062-8205-2856-7204",
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actual_sap=89,
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expected_sap_resid=+0,
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expected_pe_resid_kwh_per_m2=-3.7259,
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expected_co2_resid_tonnes_per_yr=-0.0729,
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expected_pe_resid_kwh_per_m2=-3.5393,
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expected_co2_resid_tonnes_per_yr=-0.0726,
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notes=(
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"Mitsubishi PUZ-WM50VHA PCDB 104568, ASHP cohort cert with "
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"PV + 5 kWh battery. Worksheet SAP 88.7921. Slice S0380.49 "
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"Table 12e PE factor wiring closed PE -4.50 → -3.73."
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"PV + 5 kWh battery. Worksheet SAP 88.7921. Slice S0380.50 "
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"HW seasonal-monthly fix closed PE -3.73 → -3.54."
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),
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),
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_GoldenExpectation(
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cert_number="2636-0525-2600-0401-2296",
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actual_sap=86,
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expected_sap_resid=+0,
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expected_pe_resid_kwh_per_m2=-3.4364,
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expected_co2_resid_tonnes_per_yr=-0.0603,
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expected_pe_resid_kwh_per_m2=-3.2775,
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expected_co2_resid_tonnes_per_yr=-0.0601,
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notes=(
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"Mitsubishi PUZ-WM50VHA PCDB 104568, ASHP cohort cert with "
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"PV + 5 kWh battery + 3.74 m² cantilever + 12.76 m² alt wall. "
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"Worksheet SAP 86.2641. Slice S0380.49 Table 12e PE factor "
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"wiring closed PE -4.14 → -3.44."
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"Worksheet SAP 86.2641. Slice S0380.50 HW seasonal-monthly "
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"fix closed PE -3.44 → -3.28."
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),
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),
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_GoldenExpectation(
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cert_number="3800-8515-0922-3398-3563",
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actual_sap=86,
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expected_sap_resid=+0,
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expected_pe_resid_kwh_per_m2=-3.2511,
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expected_co2_resid_tonnes_per_yr=-0.0166,
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expected_pe_resid_kwh_per_m2=-3.1623,
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expected_co2_resid_tonnes_per_yr=-0.0165,
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notes=(
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"Mitsubishi PUZ-WM50VHA PCDB 104568, ASHP cohort cert with "
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"PV + 5 kWh battery. Worksheet SAP 86.1458. Slice S0380.49 "
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"Table 12e PE factor wiring closed PE -4.01 → -3.25."
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"PV + 5 kWh battery. Worksheet SAP 86.1458. Slice S0380.50 "
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"HW seasonal-monthly fix closed PE -3.25 → -3.16."
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),
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),
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_GoldenExpectation(
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cert_number="9285-3062-0205-7766-7200",
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actual_sap=84,
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expected_sap_resid=+0,
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expected_pe_resid_kwh_per_m2=-2.8078,
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expected_co2_resid_tonnes_per_yr=-0.1003,
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expected_pe_resid_kwh_per_m2=-2.7361,
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expected_co2_resid_tonnes_per_yr=-0.1002,
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notes=(
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"Mitsubishi PUZ-WM50VHA PCDB 104568, ASHP cohort cert with "
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"PV + 5 kWh battery. Worksheet SAP 84.1369. Slice S0380.49 "
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"Table 12e PE factor wiring closed PE -3.46 → -2.81."
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"PV + 5 kWh battery. Worksheet SAP 84.1369. Slice S0380.50 "
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"HW seasonal-monthly fix closed PE -2.81 → -2.74."
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),
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),
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_GoldenExpectation(
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cert_number="9418-3062-8205-3566-7200",
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actual_sap=85,
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expected_sap_resid=+0,
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expected_pe_resid_kwh_per_m2=-3.0084,
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expected_co2_resid_tonnes_per_yr=-0.0485,
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expected_pe_resid_kwh_per_m2=-2.8890,
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expected_co2_resid_tonnes_per_yr=-0.0483,
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notes=(
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"Daikin Altherma EDLQ05CAV3 PCDB 102421 (heating_duration "
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"code '24' — continuous, all days at Th) + 5 kWh battery. "
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"Worksheet SAP 84.6305. Slice S0380.49 Table 12e PE factor "
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"wiring closed PE -3.76 → -3.01."
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"Worksheet SAP 84.6305. Slice S0380.50 HW seasonal-monthly "
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"fix closed PE -3.01 → -2.89."
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),
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),
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)
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