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31c74ab500
Add the first boiler-upgrade option to the single "Heating & Hot Water" Recommendation (ADR-0024 expansion): a dwelling whose existing wet boiler heats a hot-water cylinder is offered a new gas condensing boiler, with the cylinder jacketed when under-insulated and given a thermostat when absent. One competing Option (the Optimiser picks <=1), folded into one composite Plan line. The end-state is read from the Elmhurst before/after re-lodgements (cert 001431, gas boiler upgrade - with cylinder), which REVISE ADR-0024: - Target is always a gas condensing boiler, not fuel-preserving: every after lodges fuel 26. Gas->gas always; a non-gas wet boiler ->gas only with a mains-gas connection; electric boilers are left alone (electrification is the upgrade path). Eligibility = wet-boiler SAP code (Table 4a/4b 101-141 / 151-161 / 191-196) + not an electric boiler + mains gas present. - End-state is a Table 4b SAP code, not a PCDB index: code 102 (regular boiler + cylinder). The calculator derives the condensing seasonal efficiency from the code, so no efficiency input exists or is needed. - A modern condensing boiler has a fanned flue: the after flips `fan_flue_present` False->True on every cert (SAP 10.2 Table 4f flue-fan + the Table 4b condensing-efficiency basis). Added as a new HeatingOverlay field, routed to main_heating_details[0]. - Cylinder thermostat is always added when absent (user-locked); the jacket is the 80 mm `cylinder_insulation_type=2` end-state, applied only when the cylinder is below 80 mm (never downgrading a better one). Both are conditional per-dwelling components, not a frozen overlay. Cascade-pinned delta-0 (SAP/CO2/PE) against the relodged after via `_assert_overlay_reproduces_after`. NB the absolute SAP on this dwelling is subject to a separate Summary-path mapper roof-fidelity gap (we read the roof better-insulated than Elmhurst, scoring ~75 vs the printed 56); the gap is identical on before+after (the boiler measure never touches the roof) so it cancels and the pin still proves the exact heating field-delta. Tracked on the calculator branch. Wires the new `gas_boiler_upgrade` MeasureType through contingencies (0.26), the offline sample catalogue, the catalogue-coverage list, and the ARA first-run integration seed (the option fires on any mains-gas boiler+cylinder dwelling). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
36 lines
1.2 KiB
Python
36 lines
1.2 KiB
Python
"""Per-Measure-Type contingency rates.
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The one cost component carried separately from a Product's fully-loaded total
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(CONTEXT.md). Mirrors the legacy `recommendations/Costs.py::Costs.CONTINGENCIES`;
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extended as each measure type lands.
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"""
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_CONTINGENCY_RATES: dict[str, float] = {
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"cavity_wall_insulation": 0.10,
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"loft_insulation": 0.10,
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"sloping_ceiling_insulation": 0.10,
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"flat_roof_insulation": 0.10,
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"suspended_floor_insulation": 0.20,
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"solid_floor_insulation": 0.26,
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"mechanical_ventilation": 0.26,
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"external_wall_insulation": 0.26,
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"internal_wall_insulation": 0.26,
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"double_glazing": 0.15,
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"secondary_glazing": 0.15,
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"low_energy_lighting": 0.26,
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"high_heat_retention_storage_heaters": 0.10,
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"air_source_heat_pump": 0.25,
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"gas_boiler_upgrade": 0.26,
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"solar_pv": 0.15,
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}
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def contingency_rate(measure_type: str) -> float:
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"""Return the contingency rate for a Measure Type, raising if unknown
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(strict — do not silently default, per the repo's strict-raise convention)."""
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try:
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return _CONTINGENCY_RATES[measure_type]
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except KeyError as exc:
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raise ValueError(
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f"no contingency rate configured for measure type {measure_type!r}"
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) from exc
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