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9106621aee
Tenth slice of the SAP10 Calculator Session A (ADR-0009). Ships four
pure functions under domain.sap.worksheet.rating implementing the SAP
10.3 rating formulas:
energy_cost_factor(total_cost_gbp, total_floor_area_m2)
-> equation (7): ECF = 0.36 × cost / (TFA + 45)
Deflator 0.36 sourced from Table 12 (page 191).
sap_rating(ecf)
-> equations (8)/(9), continuous (un-rounded) SAP value:
ECF ≥ 3.5: 108.8 − 120.5 × log10(ECF)
ECF < 3.5: 100 − 16.21 × ECF
Naturally rises above 100 for net energy exporters (negative ECF).
sap_rating_integer(ecf)
-> integer SAP value as published on the EPC: round to nearest, clamp
to minimum 1 per §13.
environmental_impact_rating(co2_emissions_kg_per_yr, total_floor_area_m2)
-> equations (10)-(12), continuous EI rating:
CF = CO2 / (TFA + 45)
CF ≥ 28.3: 200 − 95 × log10(CF)
CF < 28.3: 100 − 1.34 × CF
8 AAA cycles cover: ECF formula hand-computed, SAP linear branch (typical
home), SAP log branch (high cost), boundary continuity at ECF=3.5,
net-exporter SAP > 100, integer rounding + min-1 clamp, EI linear branch,
EI log branch.
Orchestrator (S-A7) wires these into Sap10Calculator alongside the monthly
heat balance loop from S-A5e.
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| .. | ||
| src/domain | ||
| pyproject.toml | ||
| README.md | ||
domna-domain
Shared domain types — Property, Properties, BaselinePerformance, Plan, PlanPhase, Scenario, ScenarioPhase, ScenarioSnapshot, Recommendation, OptimisedPackage, EpcPropertyData, etc.
Boundary: types only. No persistence, no IO, no business logic. Other packages and services depend on domna-domain; this package depends on nothing internal.
Domain definitions live in ../../CONTEXT.md. New types added here must match the glossary terms.
Layout
src/domain/
├── __init__.py
├── property.py # Property, Properties, PropertyIdentity
├── site_notes.py
├── landlord_overrides.py
├── baseline_performance.py # lodged + effective pair (ADR-0004)
├── plan.py # Plan, PlanPhase, OptimisedPackage
├── scenario.py # Scenario, ScenarioPhase, ScenarioSnapshot (ADR-0005)
├── recommendation.py
├── geospatial.py
├── solar.py
├── anomaly_flags.py
└── ml/
├── __init__.py
├── transform.py # EpcMlTransform (versioned per §8.3)
└── schema.py
When datatypes/epc/domain/ folds in, the EPC schema types move under src/domain/epc/.