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b883e75da8
The heating Recommendation Generator (HHRSH first). Emits one "Heating & Hot Water" Recommendation whose competing whole-system bundles the Optimiser picks from; this slice builds the high-heat-retention storage Option. Its overlay is the absolute HHR end-state (Table 4a code 409 + control 2404 + dual off-peak meter + off-peak electric cylinder), pinned against the relodged after-cert in the next slice. Eligibility translates legacy is_high_heat_retention_valid to structured predicates (electric or off-gas main, not already HHR/heat-pump). mains_gas and the heat emitter are unchanged by the measure, so unset. ADR-0024. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
103 lines
4.3 KiB
Python
103 lines
4.3 KiB
Python
"""The heating Recommendation Generator.
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Detects a dwelling whose heating system should be replaced and emits one
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"Heating & Hot Water" Recommendation of competing whole-system bundles — the
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Optimiser picks at most one (ADR-0024). Each bundle is a whole-system change:
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main heating + controls + fuel + meter + the implied hot water, folded into one
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Measure Option's `HeatingOverlay`. Hot water is never a separate competing
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measure; the legacy heating-vs-HW split double-counted.
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This slice covers the high-heat-retention storage (HHRSH) bundle; the ASHP and
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boiler bundles land in later slices. Detection + pricing only — impact is
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produced by scoring (ADR-0016).
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"""
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from typing import Optional
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from datatypes.epc.domain.epc_property_data import EpcPropertyData, MainHeatingDetail
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from domain.modelling.recommendation import Cost, MeasureOption, Recommendation
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from domain.modelling.simulation import EpcSimulation, HeatingOverlay
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from repositories.product.product_repository import ProductRepository
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_HEATING_SURFACE = "Heating & Hot Water"
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_HHR_STORAGE_MEASURE_TYPE = "high_heat_retention_storage_heaters"
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# Electricity main-fuel code (Elmhurst → SAP10 Table 12).
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_ELECTRICITY_FUEL = 30
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# Table 4a SAP main-heating code for high-heat-retention storage heaters; an
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# existing HHR system lodges this already, so it is not re-recommended.
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_HHR_STORAGE_SAP_CODE = 409
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# RdSAP main_heating_category for a heat pump (Table 4a) — an existing heat pump
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# is never downgraded to storage heaters.
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_HEAT_PUMP_CATEGORY = 4
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# The HHRSH bundle's absolute end-state (ADR-0024): high-heat-retention storage
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# heaters (Table 4a code 409) on a dual off-peak meter, with an off-peak
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# electric immersion hot-water cylinder. Pinned against the relodged after-cert
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# in the cascade tests; `mains_gas` and the heat emitter are unchanged by this
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# measure, so they are not written.
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_HHR_STORAGE_OVERLAY = HeatingOverlay(
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main_fuel_type=_ELECTRICITY_FUEL,
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sap_main_heating_code=_HHR_STORAGE_SAP_CODE,
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main_heating_control=2404,
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water_heating_code=903,
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water_heating_fuel=_ELECTRICITY_FUEL,
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cylinder_size=2,
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cylinder_insulation_type=1,
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cylinder_insulation_thickness_mm=120,
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has_hot_water_cylinder=True,
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meter_type="Dual",
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)
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def recommend_heating(
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epc: EpcPropertyData, products: ProductRepository
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) -> Optional[Recommendation]:
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"""Return a "Heating & Hot Water" Recommendation of competing whole-system
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bundles for the dwelling, else None when no bundle is eligible."""
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options: list[MeasureOption] = []
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hhr_option = _hhr_storage_option(epc, products)
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if hhr_option is not None:
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options.append(hhr_option)
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if not options:
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return None
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return Recommendation(surface=_HEATING_SURFACE, options=tuple(options))
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def _hhr_storage_option(
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epc: EpcPropertyData, products: ProductRepository
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) -> Optional[MeasureOption]:
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"""The high-heat-retention storage bundle, offered for an electrically-heated
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(or off-gas) dwelling that is not already HHR or a heat pump."""
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if not _hhr_storage_eligible(epc):
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return None
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product = products.get(_HHR_STORAGE_MEASURE_TYPE)
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return MeasureOption(
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measure_type=_HHR_STORAGE_MEASURE_TYPE,
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description=(
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"Replace the heating with high heat retention storage heaters on an "
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"off-peak tariff, with an off-peak electric hot-water cylinder"
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),
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overlay=EpcSimulation(heating=_HHR_STORAGE_OVERLAY),
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cost=Cost(
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total=product.unit_cost_per_m2, contingency_rate=product.contingency_rate
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),
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material_id=product.id,
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)
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def _hhr_storage_eligible(epc: EpcPropertyData) -> bool:
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"""HHR storage suits an electrically-heated or off-gas dwelling, unless it is
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already HHR or a heat pump (translated from legacy `HeatingRecommender.
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is_high_heat_retention_valid`, which keyed on description strings)."""
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main: MainHeatingDetail = epc.sap_heating.main_heating_details[0]
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if main.sap_main_heating_code == _HHR_STORAGE_SAP_CODE:
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return False
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if main.main_heating_category == _HEAT_PUMP_CATEGORY:
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return False
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off_gas: bool = epc.sap_energy_source is None or not epc.sap_energy_source.mains_gas
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electric_main: bool = main.main_fuel_type == _ELECTRICITY_FUEL
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return electric_main or off_gas
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