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recommend_secondary_heating_removal offers one standalone Option that clears the lodged secondary system. Eligibility is purely physical (offer iff sap_heating.secondary_heating_type is set) — no effectiveness gate, since a lodged secondary is a fixed emitter per RdSAP (portables are ignored), and the electric-storage §A.2.2 no-op is the Optimiser's call (ADR-0028 decisions 1-2). Priced at a flat per-dwelling decommission cost, not room-scaled. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
57 lines
2.6 KiB
Python
57 lines
2.6 KiB
Python
"""The Secondary Heating Removal Recommendation Generator (ADR-0028).
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Offers to strip a dwelling's lodged secondary heating system so the main system
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serves 100% of space heating. A **standalone, co-selectable** Recommendation —
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not an Option in the Heating & Hot Water rec — because removing a secondary
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heater is independent of (and combinable with) a tune-up or boiler upgrade.
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Eligibility is purely physical: offered **iff a secondary is lodged**
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(`sap_heating.secondary_heating_type` is set). RdSAP only records a secondary
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when a *fixed* emitter is present (portable plug-in heaters are ignored), so a
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lodged secondary is by definition a fixed unit worth removing. There is no
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effectiveness gate — on an electric-storage main RdSAP §A.2.2 forces a default
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secondary back, making removal a no-op, but that is the Optimiser's call (it
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owns the economics), not eligibility's. Detection + pricing only; impact is
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produced later by scoring (ADR-0016).
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Priced at a flat per-dwelling decommission cost (one electrician visit to
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disconnect a fixed/hard-wired heater + localised making-good), not scaled by
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room count — the EPC lodges one secondary system with no heater count (ADR-0028).
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"""
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from typing import Final, Optional
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from datatypes.epc.domain.epc_property_data import EpcPropertyData
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from domain.modelling.measure_type import MeasureType
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from domain.modelling.recommendation import Cost, MeasureOption, Recommendation
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from domain.modelling.simulation import EpcSimulation, SecondaryHeatingOverlay
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from repositories.product.product_repository import ProductRepository
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_SECONDARY_HEATING_REMOVAL_MEASURE_TYPE: Final[MeasureType] = (
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MeasureType.SECONDARY_HEATING_REMOVAL
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)
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def recommend_secondary_heating_removal(
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epc: EpcPropertyData, products: ProductRepository
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) -> Optional[Recommendation]:
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"""Return a Secondary Heating Removal Recommendation — its single Option
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clears the lodged secondary system — else None when no secondary is lodged
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(nothing physical to remove)."""
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if epc.sap_heating.secondary_heating_type is None:
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return None
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product = products.get(_SECONDARY_HEATING_REMOVAL_MEASURE_TYPE)
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overlay = EpcSimulation(secondary_heating=SecondaryHeatingOverlay())
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cost = Cost(
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total=product.unit_cost_per_m2,
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contingency_rate=product.contingency_rate,
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)
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option = MeasureOption(
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measure_type=_SECONDARY_HEATING_REMOVAL_MEASURE_TYPE,
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description="Remove the secondary heating system",
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overlay=overlay,
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cost=cost,
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material_id=product.id,
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)
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return Recommendation(surface="Secondary Heating", options=(option,))
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