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f12e94a27a
Closes the largest single localised fabric residual on cert 000565
(roof +1.59 W/K over, area +4.70 m² over) by routing
Connected-gable surfaces through a new `connected_wall` kind that
deducts area from the residual A_RR per the spec but contributes
0 W/K per RdSAP 10 Table 4 row 4.
RdSAP 10 §3.9.2 step (d) (PDF p.23) verbatim:
"The areas of gable walls are deducted from the calculated total
RR area, and the remaining area of RR, ARR_final is then
calculated. This area is treated as roof structure.
ARR_final = ARR_wall − (ΣARR_common_wall + ΣARR_gable +
ΣARR_party + ΣARR_sheltered +
ΣARR_connected)"
RdSAP 10 Table 4 row 4 (PDF p.22):
"ARR_connected — Adjacent to heated space — U-value = 0"
The U=0 means no heat-loss contribution, but the area STILL appears
in the deduction equation as ΣARR_connected. Pre-slice the mapper's
`_map_elmhurst_rir_surface` returned None for Connected gables,
dropping them entirely from `detailed_surfaces` so the cascade
neither billed them nor deducted them. The residual A_RR was
therefore over by their lodged area.
Cert 000565 Ext1 §8.1 lodges (Simplified Type 2):
Gable Wall 1 L=4.00 H=6.00 Connected U=0
Gable Wall 2 L=8.00 H=9.00 Exposed U=1.70
Common Wall 1 L=9.00 H=1.00 U=1.70
Common Wall 2 L=5.00 H=1.80 U=1.70
Gable Wall 1 area via §3.9.2 quadratic:
A_gable_1 = 4 × (0.25 + 6)
− (6 − 1)²/2 ← subtract triangle above Common Wall 1
− (6 − 1.8)²/2 ← subtract triangle above Common Wall 2
= 25.0 − 12.5 − 8.82
= 3.68 m²
Pre-slice:
A_RR shell = 12.5 × √(34 / 1.5) = 59.51 m²
Σ wall areas = 11.25 + 10.25 + 16.08 = 37.58 m²
Residual = 21.93 m² (worksheet: 18.25; over by +3.68)
Roof W/K = 21.93 × 0.35 = 7.68 (worksheet: 6.39; over by +1.29)
3-layer fix:
1. Mapper `_map_elmhurst_rir_surface` (datatypes/epc/domain/mapper.py)
now routes "Connected" gable_type to kind="connected_wall" with
u_value=0 and area via the Simplified Type 2 quadratic correction.
2. Heat transmission `heat_transmission_from_cert` (domain/sap10_
calculator/worksheet/heat_transmission.py) adds a connected_wall
branch that deducts area from rr_walls_in_a_rr_area but skips
walls/party W/K contribution.
3. AAA test pins Ext1 Connected gable area at 3.68 m² and U=0.
Movement at HEAD `b7fa5f74` → post-slice (cert 000565):
Fabric (cascade vs ws):
walls 602.53 → 602.53 (Δ -1.54 W/K; unchanged)
roof 52.97 → 51.68 (Δ +1.59 → +0.30 W/K; closes 81%)
TB 129.35 → 128.80 (Δ +0.70 → +0.15 W/K; closes 79%)
total area 862.34 → 858.66 (Δ +4.70 → +1.02 m²; closes 78%)
total W/K 937.40 → 935.54 (Δ +0.33 → -1.52 W/K; sign flips)
End-result pins:
**sap_score (int) 28 → 29 ✓ EXACT vs ws 29** (RECOVERED from
S0380.107 transient
rounding flip)
sap_score_continuous 28.4959 → 28.5380 (Δ -0.0128 → +0.0293)
ecf 5.3881 → 5.3838 (Δ +0.0015 → -0.0028)
total_fuel_cost_gbp 4681.39 → 4677.64 (Δ +1.13 → -2.62)
co2_kg_per_yr 6449.13 → 6444.27 (Δ +1.51 → -3.35)
space_heating_kwh 59028.80 → 58974.84 (Δ +20.5 → -33.5)
main_heating_fuel 34722.83 → 34691.09 (Δ +12.0 → -19.7)
lighting_kwh 1382.67 → 1382.67 (unchanged)
pumps_fans_kwh ✓ EXACT (unchanged)
Continuous SAP and downstream pins SIGN-FLIPPED again
(cascade was over post-.107, now under post-.108). Per user
direction: transient drift acceptable while closing a true
intermediate-value bug. The remaining net HTC -1.52 W/K is
mostly walls (-1.54 W/K) — closing the Detailed-RR walls
residual is the next leverage front.
Cohort safety: none of the 6 cohort certs lodge a Connected
gable (grep audit across all Summary fixtures). The new
`connected_wall` branch only fires for the cert 000565 Ext1 BP.
Test count: 606 pass + 8 expected 000565 fails → **608 pass +
7 expected 000565 fails** (sap_score back to exact + new
Connected-gable test green). Pyright net-zero per touched
file (57 baseline → 57 post-change).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| .. | ||
| addresses | ||
| data_transformation | ||
| epc | ||
| sap10_calculator | ||
| sap10_ml | ||
| tasks | ||
| postcode.py | ||