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Cylinder with unknown insulation defaults per RdSAP Table 29 age band 🟩

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Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Jun-te Kim 2026-07-02 16:11:10 +00:00
parent 6accf365d7
commit ecefd439fd
1 changed files with 14 additions and 0 deletions
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14
domain/sap10_calculator/rdsap/cert_to_inputs.py
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@ -7126,6 +7126,20 @@ def _cylinder_storage_loss_override(
insulation_label, thickness_mm = "loose_jacket", 0.0
if insulation_label is None and thickness_mm == 0.0:
insulation_label = "loose_jacket"
# RdSAP 10 Table 29 (PDF p.56) "Hot water cylinder insulation if not
# accessible": a lodged cylinder with NO insulation data at all takes
# the age-band default — the same row the §10.7 no-water-heating
# default uses. An ABSENT thickness means not accessible (Table 29);
# a lodged 0 mm means uninsulated (handled above). When the age band
# itself is unresolvable, fall through to the legacy None (zero loss)
# rather than raising mid-rebaseline.
if insulation_label is None and thickness_mm is None:
band = (_dwelling_age_band(epc) or "")[:1].upper()
table_29_default = _TABLE_29_DEFAULT_CYLINDER_INSULATION_BY_AGE.get(band)
if table_29_default is not None:
default_code, default_mm = table_29_default
insulation_label = _cylinder_storage_loss_insulation_label(default_code)
thickness_mm = float(default_mm)
if insulation_label is None:
return None
if thickness_mm is None: