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Slice S0380.170: Community heating mapper unblock (Table 12 dispatch)
Closes the 5 community-heating variants in the heating-systems corpus
(community heating 1/2/3/4/6 on property 001431). Pre-slice the
mapper returned `MainHeatingDetail.main_fuel_type=''` for every
community-heating cert because §14.0 lodges no Fuel Type — only EES
'COM' + a Table 4a heat-network SAP code (301/302/304). The cascade
strict-raised `MissingMainFuelType` per S0380.132. The actual fuel
that bills the cascade lives in the §14.1 Community Heating/Heat
Network block, which the extractor was skipping entirely.
SAP 10.2 Table 12 (PDF p.189) defines the heat-network fuel codes:
Boilers + Mains Gas → 51 (heat from boilers — mains gas)
Boilers + Mineral oil → 53 (heat from boilers — oil)
Boilers + Coal → 54 (heat from boilers — coal)
Boilers + Biomass → 43 (heat from boilers — biomass)
Combined Heat and Power → 48 (heat from CHP; fuel-agnostic)
Heat pump + Electricity → 41 (heat from electric heat pump)
Per spec text the upstream fuel determines the boiler-side code; CHP
is fuel-agnostic at the Table 12 cost / CO2 / PE level.
Three layers wired:
1. Survey schema — new `CommunityHeating` dataclass alongside
`MainHeating2` carrying the §14.1 fields (heating_type,
community_heat_source, community_fuel_type, heating_controls_ees,
heating_controls_sap, chp_fuel_factor). Mutually exclusive with
`main_heating_2` at the §14.1 level. Attached as
`MainHeating.community_heating: Optional[CommunityHeating] = None`.
2. Extractor — new `_extract_community_heating()` method bracketed by
"14.1 Community Heating/Heat Network" / "14.2 Meters". Returns
None on individually-heated dwellings (no Community Heat Source
lodged). Wired into `_extract_main_heating()`.
3. Mapper — new `_resolve_community_heating_fuel_code(heat_source,
fuel)` dispatch helper + `_ELMHURST_COMMUNITY_BOILER_FUEL_TO_TABLE_12`
constant for the boiler upstream-fuel split. Wired in
`_map_elmhurst_sap_heating` after the EES-code-to-fuel dispatch
and before the strict-raise on absent SAP code.
Per the standard slice workflow + [[feedback-aaa-test-convention]]:
- 5 new AAA tests in `test_community_heating_mapper_resolves_table_12_
fuel_code` parametrized over the 5 corpus variants, asserting the
mapper resolves the expected Table 12 code per variant.
- The existing parametrized residual-pin test in
`test_heating_systems_corpus_residual_matches_pin` picks up the
5 community-heating variants with cascade-side residuals pinned as
forcing functions for follow-up slices:
variant dSAP dcost dCO2 dPE
CH1 (Boilers/Gas) +0.59 -£14 -787 -3827
CH2 (CHP/Gas) +4.50 -£104 -1430 +1506
CH3 (HP/Elec) +0.59 -£14 +1614 +11879
CH4 (CHP/Oil) +4.50 -£104 -4397 +495
CH6 (CHP/Coal) -3.52 +£81 -2935 +7865
These reflect open cascade-side work (SAP 10.2 Appendix C CHP/
boiler heat-fraction split missing — cascade treats CHP+Boilers as
100% CHP; community-HP COP cascade missing — cascade doesn't divide
delivered heat by COP for Table 12 code 41; heat-network overall
CO2/PE blended-factor cascade missing — cascade doesn't compute
worksheet rows (386)/(486)). Pinned per [[feedback-zero-error-strict]];
follow-up slices close gaps and re-pin smaller residuals.
- `_BLOCKED_BY_MISSING_MAIN_FUEL_TYPE` tuple now empty; the
blocked-tier test pytest-skipped via `pytest.mark.skipif` with a
reason naming this slice.
Test baseline at HEAD: 921 pass + 1 skipped (was 916 + 0 at
predecessor 7e08e7af). Pyright net-zero on affected files
(elmhurst_site_notes.py, elmhurst_extractor.py, mapper.py,
test_heating_systems_corpus.py): 32 → 32.
Per [[feedback-spec-citation-in-commits]] the dispatch is grounded
in SAP 10.2 Table 12 (PDF p.189). Per
[[feedback-bigger-slices-for-uniform-work]] all 5 variants land in
one slice — the work is uniform (single Elmhurst label dict + single
dispatch helper) and the per-variant residuals surface together
because of cascade-side gaps, not mapper-side variation.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
Khalim Conn-Kowlessar
parent
7e08e7af71
commit
9f0d23adc6
4 changed files with 237 additions and 6 deletions
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@ -6,6 +6,7 @@ from datatypes.epc.surveys.elmhurst_site_notes import (
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AlternativeWall,
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BathsAndShowers,
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BuildingPartDimensions,
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CommunityHeating,
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ElmhurstSiteNotes,
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ExtensionPart,
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FloorDetails,
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@ -1239,6 +1240,7 @@ class ElmhurstSiteNotesExtractor:
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else None
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)
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main_heating_2 = self._extract_main_heating_2()
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community_heating = self._extract_community_heating()
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return MainHeating(
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heat_emitter=self._local_str(lines, "Heat Emitter"),
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fuel_type=self._local_str(lines, "Fuel Type"),
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@ -1254,6 +1256,7 @@ class ElmhurstSiteNotesExtractor:
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main_heating_ees=self._local_str(lines, "Main Heating EES Code"),
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secondary_heating_sap_code=secondary_code,
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main_heating_2=main_heating_2,
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community_heating=community_heating,
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)
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def _extract_main_heating_2(self) -> Optional[MainHeating2]:
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@ -1304,6 +1307,38 @@ class ElmhurstSiteNotesExtractor:
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main_heating_sap_code=main_heating_sap_code,
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)
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def _extract_community_heating(self) -> Optional[CommunityHeating]:
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"""§14.1 Community Heating/Heat Network block. Lodged in place of
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§14.1 Main Heating2 when the §14.0 Main Heating SAP code names a
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heat-network row (Table 4a 301/302/304). Returns None when no
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§14.1 Community Heating block is present on the cert.
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The block carries the Community Heat Source (Boilers / CHP /
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Heat pump) + Community Fuel Type (Mains Gas / Electricity /
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Mineral oil or biodiesel / Coal) — together these resolve the
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Table 12 heat-network fuel code that bills the cascade. See
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`_resolve_community_heating_fuel_code` in the mapper.
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"""
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lines = self._section_lines(
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"14.1 Community Heating/Heat Network", "14.2 Meters",
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)
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# Absence of the §14.1 Community Heating block: no marker found
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# → `_section_lines` returns []. Lodgement convention also
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# leaves Community Heat Source empty on individually-heated
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# dwellings; treat both as "no community heating present".
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heat_source = self._local_str(lines, "Community Heat Source")
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if not lines or not heat_source:
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return None
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return CommunityHeating(
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heating_type=self._local_str(lines, "Heating Type"),
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pcdf_boiler_reference=self._local_val(lines, "PCDF Boiler Reference"),
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community_heat_source=heat_source,
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community_fuel_type=self._local_str(lines, "Community Fuel Type"),
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heating_controls_ees=self._local_str(lines, "Heating Controls EES"),
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heating_controls_sap=self._local_str(lines, "Heating Controls SAP"),
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chp_fuel_factor=self._local_val(lines, "CHP Fuel Factor"),
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)
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def _extract_meters(self) -> Meters:
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return Meters(
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electricity_meter_type=self._str_val("Electricity meter type"),
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@ -476,6 +476,50 @@ _EXPECTATIONS: tuple[_CorpusExpectation, ...] = (
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# cascade-side §A.2.2 efficiency or tariff-routing gap; pinned as
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# forcing function for follow-up.
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_CorpusExpectation(variant='no system', block='11a', expected_sap_resid=+1.1783, expected_cost_resid_gbp=-27.1485, expected_co2_resid_kg=-49.8272, expected_pe_resid_kwh=-562.4367),
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# Slice S0380.170 unblocked the 5 community-heating variants. Per
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# SAP 10.2 Table 12 (PDF p.189) the heat-network fuel code comes
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# from the §14.1 Community Heat Source × Community Fuel Type pair:
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# `Boilers × Mains Gas` → 51, `CHP × *` → 48 (fuel-agnostic),
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# `Heat pump × Electricity` → 41. New CommunityHeating dataclass
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# on `ElmhurstSiteNotes.main_heating` + extractor `_extract_
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# community_heating()` + mapper `_resolve_community_heating_fuel_
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# code(heat_source, fuel)` + dispatch wired before the strict-raise.
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#
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# CH1 (301 / Boilers / Mains Gas / code 51): cascade lands ~£14
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# under-cost; the gap is the missing electricity-for-heat-
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# distribution kWh stream not propagating to (340)/(342) at the
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# heat-network rate. CO2/PE residuals reflect the heat-network
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# overall CO2 / PE factor calc not yet matching Elmhurst's (386)/
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# (486) blended-factor cascade.
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#
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# CH2/CH4 (302 / CHP / fuel / code 48): cascade overshoots SAP by
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# +4.5 because it treats CHP+Boilers as 100% CHP at 2.97 p/kWh,
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# missing the SAP 10.2 Appendix C 35% CHP / 65% boiler heat-
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# fraction split for "Existing CHP (2015+), flexible operation".
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# The boiler-side fuel-code dispatch + CHP-credit emissions for
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# exported electricity (worksheet rows (464)/(466)) are the next
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# cascade-side work.
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#
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# CH3 (304 / Heat pump / Electricity / code 41): cascade SAP +0.59
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# (same as CH1 — both worksheet SAP=64.2427 with identical Block
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# 10b shapes). CO2/PE residuals are large because the cascade
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# doesn't yet divide by the community-HP COP — Table 12 code 41
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# carries electricity factors but the worksheet divides delivered
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# heat by COP first.
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#
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# CH6 (302 / CHP / Coal / code 48): same CHP split gap as CH2/CH4
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# but with upstream coal — cascade under-CO2 by ~2935 kg and
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# over-PE by ~7865 kWh because the boiler-side code-54 coal CO2/PE
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# factors are not applied.
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#
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# All 5 pinned as forcing functions for follow-up cascade work
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# (CHP heat-fraction split, community-HP COP cascade, heat-network
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# overall factor calc). Mapper-side closure complete.
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_CorpusExpectation(variant='community heating 1', block='11b', expected_sap_resid=+0.5915, expected_cost_resid_gbp=-13.6289, expected_co2_resid_kg=-787.2531, expected_pe_resid_kwh=-3827.1887),
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_CorpusExpectation(variant='community heating 2', block='11b', expected_sap_resid=+4.5018, expected_cost_resid_gbp=-103.7279, expected_co2_resid_kg=-1430.3212, expected_pe_resid_kwh=+1506.0355),
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_CorpusExpectation(variant='community heating 3', block='11b', expected_sap_resid=+0.5915, expected_cost_resid_gbp=-13.6289, expected_co2_resid_kg=+1613.7837, expected_pe_resid_kwh=+11878.7588),
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_CorpusExpectation(variant='community heating 4', block='11b', expected_sap_resid=+4.5018, expected_cost_resid_gbp=-103.7279, expected_co2_resid_kg=-4397.0794, expected_pe_resid_kwh=+494.6090),
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_CorpusExpectation(variant='community heating 6', block='11b', expected_sap_resid=-3.5201, expected_cost_resid_gbp=+81.1097, expected_co2_resid_kg=-2934.9021, expected_pe_resid_kwh=+7864.5950),
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)
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@ -495,16 +539,15 @@ _EXPECTATIONS: tuple[_CorpusExpectation, ...] = (
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# - Solid-fuel boilers (Table 4a 150-160, 600-636) ×10
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# - PCDB-lodged "Bulk LPG" mapper-dict gap ×1
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_BLOCKED_BY_MISSING_MAIN_FUEL_TYPE: tuple[str, ...] = (
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'community heating 1',
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'community heating 2',
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'community heating 3',
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'community heating 4',
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'community heating 6',
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# Slice S0380.133 unblocked all 10 solid-fuel variants via the
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# §14.0 EES-code-driven fuel derivation; they now appear in
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# `_EXPECTATIONS` above with their post-derivation residual pins.
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# Slice S0380.166 unblocked `pcdb 3` via `"Bulk LPG": 27` in the
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# Elmhurst label dict; it now lives in `_EXPECTATIONS` at ±0.0000.
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# Slice S0380.170 unblocked all 5 community-heating variants via
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# the new CommunityHeating extractor field + the §14.1 Heat
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# Source × Fuel Type → Table 12 fuel-code dispatch. They now
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# appear in `_EXPECTATIONS` with pinned cascade-side residuals.
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)
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@ -674,9 +717,13 @@ def test_heating_systems_corpus_residual_matches_pin(
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)
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@pytest.mark.skipif(
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not _BLOCKED_BY_MISSING_MAIN_FUEL_TYPE,
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reason="all blocked variants have been unblocked (latest: S0380.170)",
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)
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@pytest.mark.parametrize(
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"variant",
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_BLOCKED_BY_MISSING_MAIN_FUEL_TYPE,
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_BLOCKED_BY_MISSING_MAIN_FUEL_TYPE or ("__placeholder__",),
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ids=lambda v: v,
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)
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def test_heating_systems_corpus_blocked_variant_raises_missing_main_fuel_type(
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@ -703,3 +750,52 @@ def test_heating_systems_corpus_blocked_variant_raises_missing_main_fuel_type(
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# Act / Assert
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with pytest.raises(MissingMainFuelType):
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cert_to_inputs(epc, prices=SAP_10_2_SPEC_PRICES)
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# S0380.170 — Community heating mapper dispatch coverage tests.
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#
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# These focused tests document the per-variant resolution path
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# independently of the cascade. The parametrized `_EXPECTATIONS` test
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# above is the load-bearing assertion that the cascade lands at the
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# pinned residual; these unit tests assert the mapper's `main_fuel_type`
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# resolves to the correct Table 12 heat-network code per
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# `_resolve_community_heating_fuel_code(heat_source, fuel)`.
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_COMMUNITY_HEATING_EXPECTED_FUEL_CODES: tuple[tuple[str, int], ...] = (
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# (variant, SAP 10.2 Table 12 fuel code)
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('community heating 1', 51), # Boilers + Mains Gas
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('community heating 2', 48), # CHP + Mains Gas
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('community heating 3', 41), # Heat pump + Electricity
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('community heating 4', 48), # CHP + Mineral oil or biodiesel
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('community heating 6', 48), # CHP + Coal
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)
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@pytest.mark.parametrize(
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("variant", "expected_table_12_code"),
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_COMMUNITY_HEATING_EXPECTED_FUEL_CODES,
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ids=lambda v: v if isinstance(v, str) else str(v),
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)
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def test_community_heating_mapper_resolves_table_12_fuel_code(
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variant: str, expected_table_12_code: int,
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) -> None:
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# Arrange — community-heating Summary lodges §14.0 EES='COM' + a
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# Table 4a heat-network SAP code, with §14.0 Fuel Type empty. The
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# §14.1 Community Heating/Heat Network block carries the upstream
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# Heat Source + Fuel Type pair, which the mapper's
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# `_resolve_community_heating_fuel_code` translates to a SAP 10.2
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# Table 12 (PDF p.189) heat-network code per the dispatch:
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# Boilers + Mains Gas → 51
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# Combined Heat and Power → 48 (fuel-agnostic)
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# Heat pump + Electricity → 41
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summary_pdf, _ = _variant_paths(variant)
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pages = _summary_pdf_to_textract_style_pages(summary_pdf)
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site_notes = ElmhurstSiteNotesExtractor(pages).extract()
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# Act
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epc = EpcPropertyDataMapper.from_elmhurst_site_notes(site_notes)
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# Assert — Main 1 picks up the Table 12 fuel code derived from the
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# §14.1 Community Heat Source + Community Fuel Type pair.
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main_heating_details = epc.sap_heating.main_heating_details
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assert main_heating_details is not None and len(main_heating_details) >= 1
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assert main_heating_details[0].main_fuel_type == expected_table_12_code
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@ -4226,6 +4226,50 @@ _ELMHURST_MAIN_HEATING_EES_TO_FUEL_CODE: Final[dict[str, int]] = {
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}
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# Elmhurst §14.1 "Community Fuel Type" labels mapped to the SAP 10.2
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# Table 12 heat-network boiler fuel code (PDF p.189). Used when
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# `community_heat_source == "Boilers"` — the upstream fuel determines
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# which 51-58 row applies. CHP is fuel-agnostic at the Table 12 cost /
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# CO2 / PE level (code 48 carries the same factors irrespective of
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# upstream fuel); Heat-pump networks always route to code 41.
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#
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# Spec-correct codes from SAP 10.2 Table 12:
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# 51 = heat from boilers — mains gas
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# 52 = heat from boilers — LPG
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# 53 = heat from boilers — oil
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# 54 = heat from boilers — coal
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# 43 = heat from boilers — biomass
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_ELMHURST_COMMUNITY_BOILER_FUEL_TO_TABLE_12: Final[dict[str, int]] = {
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"Mains Gas": 51,
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"Mineral oil or biodiesel": 53,
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"Coal": 54,
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"Biomass": 43,
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}
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def _resolve_community_heating_fuel_code(
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heat_source: str, community_fuel: str,
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) -> Optional[int]:
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"""Resolve the SAP 10.2 Table 12 (PDF p.189) heat-network fuel code
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from the §14.1 "Community Heat Source" + "Community Fuel Type"
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pair. Returns None when the heat-source string isn't recognised
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(mapper-coverage gap for a future fixture).
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Dispatch table (verified against corpus block 10b/11b/12b/13b):
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- "Combined Heat and Power" → 48 (heat from CHP; fuel-agnostic)
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- "Heat pump" → 41 (heat from electric heat pump)
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- "Boilers" + upstream fuel → 51/52/53/54/43 per
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`_ELMHURST_COMMUNITY_BOILER_FUEL_TO_TABLE_12`
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"""
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if heat_source == "Combined Heat and Power":
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return 48
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if heat_source == "Heat pump":
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return 41
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if heat_source == "Boilers":
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return _ELMHURST_COMMUNITY_BOILER_FUEL_TO_TABLE_12.get(community_fuel)
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return None
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class UnmappedElmhurstLabel(ValueError):
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"""An Elmhurst Summary lodged a finite-enum label that the mapper
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does not yet know how to translate to the SAP10 cascade enum.
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@ -4679,6 +4723,22 @@ def _map_elmhurst_sap_heating(survey: ElmhurstSiteNotes) -> SapHeating:
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and mh.main_heating_ees in _ELMHURST_MAIN_HEATING_EES_TO_FUEL_CODE
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):
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main_fuel_int = _ELMHURST_MAIN_HEATING_EES_TO_FUEL_CODE[mh.main_heating_ees]
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# Community heating: §14.0 lodges EES='COM' + a Table 4a heat-network
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# SAP code (301/302/304) but no §14.0 Fuel Type. The §14.1 Community
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# Heating/Heat Network block carries the actual heat source (Boilers
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# / CHP / Heat pump) + upstream fuel (Mains Gas / Electricity /
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# Mineral oil or biodiesel / Coal) which together resolve the
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# Table 12 heat-network fuel code (PDF p.189, codes 41/43/48/51-58).
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# Cascade routes through `_is_heat_network_main` (which keys on the
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# SAP code) for the DLF and seasonal-efficiency overrides.
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if (
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main_fuel_int is None
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and mh.community_heating is not None
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):
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main_fuel_int = _resolve_community_heating_fuel_code(
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mh.community_heating.community_heat_source,
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mh.community_heating.community_fuel_type,
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)
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heat_emitter_int = _elmhurst_heat_emitter_int(
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mh.heat_emitter,
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main_floor=survey.floor,
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@ -246,6 +246,41 @@ class MainHeating2:
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main_heating_sap_code: Optional[int] = None
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@dataclass
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class CommunityHeating:
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"""Elmhurst §14.1 "Community Heating/Heat Network" block. Lodged
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when the §14.0 Main Heating SAP code identifies a heat-network row
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(Table 4a 301-304). Mutually exclusive with `MainHeating2` at the
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§14.1 level (the extractor closes §14.0 at whichever §14.1 form
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appears first).
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The §14.0 "Main Heating SAP Code" identifies the Table 4a category
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(301 = community boilers, 302 = CHP + boilers, 304 = community heat
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pump), but the fuel that ultimately bills the cascade comes from
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the Community Fuel Type field combined with the Community Heat
|
||||
Source. See SAP 10.2 Table 12 (PDF p.189) heat-network fuel codes:
|
||||
|
||||
- Boilers + Mains Gas → code 51
|
||||
- Boilers + Mineral oil → code 53
|
||||
- Boilers + Coal → code 54
|
||||
- Boilers + Biomass → code 43
|
||||
- Combined Heat and Power → code 48 (fuel-agnostic)
|
||||
- Heat pump + Electricity → code 41
|
||||
"""
|
||||
|
||||
heating_type: str = "" # "Space and Water Heating"
|
||||
pcdf_boiler_reference: Optional[str] = None
|
||||
community_heat_source: str = "" # "Boilers" / "Combined Heat and Power" / "Heat pump"
|
||||
community_fuel_type: str = "" # "Mains Gas" / "Electricity" / "Mineral oil or biodiesel" / "Coal"
|
||||
heating_controls_ees: str = ""
|
||||
heating_controls_sap: str = ""
|
||||
# SAP 10.2 Appendix C — CHP Fuel Factor lookup label. Drives the
|
||||
# CHP-vs-boiler heat-fraction split when `community_heat_source ==
|
||||
# "Combined Heat and Power"`. Absent on non-CHP networks (e.g.
|
||||
# CH1 boilers-only / CH3 heat-pump only).
|
||||
chp_fuel_factor: Optional[str] = None
|
||||
|
||||
|
||||
@dataclass
|
||||
class MainHeating:
|
||||
heat_emitter: str # e.g. "Radiators"
|
||||
|
|
@ -289,6 +324,11 @@ class MainHeating:
|
|||
# the §14.1 block is absent OR lodges only placeholder zeros (PCDB-
|
||||
# only certs). See `MainHeating2` docstring above.
|
||||
main_heating_2: Optional[MainHeating2] = None
|
||||
# §14.1 "Community Heating/Heat Network" block — Optional, lodged
|
||||
# in place of Main Heating2 when the §14.0 SAP code identifies a
|
||||
# heat-network row (Table 4a 301/302/304). Mutually exclusive with
|
||||
# `main_heating_2`. None on individually-heated dwellings.
|
||||
community_heating: Optional[CommunityHeating] = None
|
||||
|
||||
|
||||
@dataclass
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue