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Khalim Conn-Kowlessar dfcd7af57c fix(heat-network): apply Table 4c(3) flat-rate charging factor to demand 
SAP 10.2 Table 4c(3) (PDF p.169) "Factor for controls and charging method"
multiplies a heat network's heat requirement by 1.05-1.10 for FLAT-RATE
charging (note d: household pays a fixed amount regardless of heat used, so
no incentive to economise), and by 1.0 for charging linked to use. The
worksheet folds it into the heat-network requirement alongside the Table 12c
distribution loss factor:
  (307) space = (98c) x (302) x (305) x (306)
  (310) DHW   = (64)  x (305a) x (306)
Our cascade applied (306) DLF but never (305)/(305a), so every flat-rate
community-heating cert under-counted demand -> over-rated SAP.

Folded the factor into the 1/DLF efficiency override at the space-heating
(206) and DHW (water-inherits-from-main) sites. Space column adds +0.05 for
no thermostatic control (2301/2302); DHW column is 1.05 flat-rate / 1.0
linked-to-use.

Corpus (RdSAP-21.0.1, 1000 certs): community cluster median +0.32 -> -0.19,
within-0.5 38% -> 62% (control 2307 +0.83 -> -0.19; 2306 unchanged at factor
1.0 as spec requires). Overall gauge 65.0% -> 65.9%, MAE 1.174 -> 1.160.
Ratcheted the corpus-test floor 0.62 -> 0.63 / MAE ceiling 1.25 -> 1.22.

Also records (corpus-test comment + scripts/decompose_co2_pe_error.py) the
disproof of the prior "CO2/PE +5% is a factor/scope bug" lead: factors are
spec-exact, scope identical, and the bias is per-cert demand fidelity
(corr(SAP-err, PE-diff) = -0.54), not a one-slice factor fix.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-14 01:54:51 +00:00
..
eon added floats helper 2026-06-12 14:28:41 +00:00
analyse_api_sap_clusters.py scripts: promote the API SAP-accuracy toolkit from /tmp 2026-06-04 16:52:09 +00:00
decompose_api_cost_error.py feat(diag): per-component cost decomposition for API SAP errors 2026-06-06 17:37:05 +00:00
decompose_co2_pe_error.py fix(heat-network): apply Table 4c(3) flat-rate charging factor to demand 2026-06-14 01:54:51 +00:00
download_cotality_evidence.py new methods for downloading all core files for pashub URL. Download currently not being authorised 2026-03-24 08:47:59 +00:00
elmhurst_input_sheet.py fix(debug-tool): read the domain field names, not the schema ones 2026-06-05 19:48:02 +00:00
eval_api_sap_accuracy.py scripts: promote the API SAP-accuracy toolkit from /tmp 2026-06-04 16:52:09 +00:00
fetch_2026_epc_sample.py scripts: promote the API SAP-accuracy toolkit from /tmp 2026-06-04 16:52:09 +00:00
fetch_cohort2_api_jsons.py Move sap10_calculator tests to tests/domain/sap10_calculator/ for CI 2026-06-02 16:58:00 +00:00
fetch_epc_bulk_sample.py feat(modelling): sample a year from the EPC bulk export, offline-ready 2026-06-04 12:20:57 +00:00
fetch_epc_dump.py feat(modelling): CLI to fetch an EPC dump + build the inspection report 2026-06-04 11:26:17 +00:00
historic_epc_demo.py added type hinting to uprn 2026-05-12 09:40:12 +00:00
init_db.py init db 2026-03-31 11:45:59 +00:00
profile_api_error.py feat(diag): profile API SAP error against raw-API characteristics 2026-06-07 20:38:19 +00:00
profile_case34.py docs(profile-case34): mark the space-demand residual closed (450e33e1) 2026-06-11 09:01:41 +00:00
rename_sharepoint_files.py rename files in sharepoint to desired structure 2026-05-20 16:26:07 +00:00
run_audit_generator_local.py empty commit to trigger workflows 2026-06-11 09:32:14 +00:00
run_modelling_cohort.py feat(modelling): turnkey offline cohort script (tables + CSV) 2026-06-04 09:30:53 +00:00
run_modelling_e2e.py 17.1 and 18 done by claude 2026-06-12 12:52:36 +00:00
run_property_report.py feat(modelling): CLI to fetch an EPC dump + build the inspection report 2026-06-04 11:26:17 +00:00
sero_address_list.csv [UNRELATED] update sero address list for sharepoint file renaming 2026-06-05 14:22:09 +00:00