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domain/building_geometry.gross_heat_loss_wall_area(epc, identifier) sums heat_loss_perimeter x room_height across a building part's storeys — the heat-loss wall area (party walls excluded by construction), not total wall area. Lives outside the calculator so Modelling cost quantities can reuse it; the calculator computes the same quantity inline today and should be DRY'd onto this later (coordinated with the calculator branch). Pinned at 45.93 m^2 against the 000490 MAIN part. Toward #1155 cost (behaviour 4). pyright strict clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
33 lines
1.2 KiB
Python
33 lines
1.2 KiB
Python
"""Building geometry derived purely from an EpcPropertyData.
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Reusable outside the SAP calculator (e.g. for Modelling cost quantities).
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Today this re-derives the heat-loss wall area; the calculator computes the
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same quantity inline (`heat_transmission._part_geometry`). A later, calculator-
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branch-coordinated refactor should DRY the two onto this module so there is a
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single source of truth. See the project memory on calculator geometry.
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"""
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from datatypes.epc.domain.epc_property_data import (
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BuildingPartIdentifier,
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EpcPropertyData,
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)
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def gross_heat_loss_wall_area(
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epc: EpcPropertyData, identifier: BuildingPartIdentifier
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) -> float:
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"""Gross external wall area of one building part, in m^2: the sum over its
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storeys of heat-loss perimeter x room height. This is the heat-loss area
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(party walls are excluded — they are not on the heat-loss perimeter); it is
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not netted of window/door openings.
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"""
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part = next(
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candidate
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for candidate in epc.sap_building_parts
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if candidate.identifier is identifier
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)
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area = sum(
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fd.heat_loss_perimeter_m * fd.room_height_m
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for fd in part.sap_floor_dimensions
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)
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return round(area, 2)
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