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f182f36802
Slice 7 of ADR-0025 costing: the modelling-layer interpretation half of the split. ashp_cost_inputs derives existing system (mains_gas/fuel/SAP-code), size band (floor area <= 75 m2), design heat loss (floor_area x 0.05 -- the chosen proxy over HLC, ADR updated), radiator count (habitable + 3, floor-area fallback) and reusable-wet-system flag. Catalogue math (Products) stays EPC-free. ADR-0025 updated to record the floor-area pump-sizing choice. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
31 lines
1.4 KiB
Python
31 lines
1.4 KiB
Python
"""The dwelling interpretation that feeds `Products.ashp_bundle_cost` — reading
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an `EpcPropertyData` into a typed `AshpCostInputs` (ADR-0025). This is the
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modelling-layer half of the split: it derives the existing system, property
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size band, design heat loss (floor-area proxy), radiator count, and whether a
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wet system can be reused — the catalogue math (Products) stays EPC-free.
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"""
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from domain.modelling.generators.heating_recommendation import ashp_cost_inputs
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from domain.modelling.products import AshpCostInputs, AshpExistingSystem
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from tests.domain.modelling._elmhurst_recommendation import (
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parse_recommendation_summary,
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)
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def test_mains_gas_dwelling_maps_to_a_reusable_wet_gas_system() -> None:
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# Arrange — a mains-gas regular boiler with radiators (90 m2, 7 habitable
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# rooms): an existing wet system the ASHP can reuse.
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epc = parse_recommendation_summary(
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"ashp_from_system_boiler_with_cylinder_001431_before.pdf"
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)
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# Act
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inputs: AshpCostInputs = ashp_cost_inputs(epc)
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# Assert — gas, large (90 > 75 m2), 4.5 kW (90 x 0.05), 10 radiators
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# (7 habitable + 3), reusable wet system.
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assert inputs.existing_system is AshpExistingSystem.GAS
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assert inputs.is_small_property is False
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assert abs(inputs.design_heat_loss_kw - 4.5) <= 1e-9
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assert inputs.radiator_count == 10
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assert inputs.has_reusable_wet_system is True
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