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ASHP sizing caps at the largest pump for a high-heat-loss dwelling 🟩

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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar 2026-07-03 10:14:10 +00:00
parent b18fc3878b
commit 7707df3294
1 changed files with 12 additions and 0 deletions
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12
tests/domain/modelling/test_heating_recommendation.py
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@ -779,3 +779,15 @@ def test_ashp_sizing_selects_the_smallest_pump_meeting_the_design_heat_loss() ->
# Assert — the 7 kW aroTHERM plus rung.
assert pcdb_id == 110265
def test_ashp_sizing_caps_at_the_largest_pump_for_a_high_heat_loss_dwelling() -> None:
# A very leaky dwelling (17.5 kW design heat loss, e.g. UPRN 10002468116)
# exceeds the domestic aroTHERM plus range, so sizing caps at the largest
# rung — the 12 kW aroTHERM plus (PCDB 110281, ~11.48 kW) — an honest, still
# far better than the fixed 5 kW pump whose PSR collapsed to ~0.25.
# Act
pcdb_id = select_ashp_pcdb_id(design_heat_loss_kw=17.5)
# Assert — capped at the 12 kW rung, not left undersized at 5 kW.
assert pcdb_id == 110281