Model/packages/domain
Khalim Conn-Kowlessar d004dc3f5c slice S-B13: skip cylinder + primary HW losses for instantaneous systems
Water heating codes 907 (single-point gas) and 909 (electric instantaneous)
describe no-cylinder, point-of-use systems with no primary circuit.
The predicted_hot_water_kwh model was adding 366 kWh cylinder-storage
loss + 245 kWh primary-pipework loss on top of useful demand for these
certs — over-counting HW by 600+ kWh.

Discovered hand-tracing cert 2903-8339 (11m² Top-floor flat studio,
water_heating_code=909, actual SAP 75, predicted 55).

100-cert parity probe:
  MAE 4.53 → 4.48   (-0.05)
  RMSE 5.96 → 5.81
  bias -0.57 → -0.52

Smaller MAE delta than S-B12 because instantaneous-HW certs are a
smaller subset, but the affected dwellings are exactly the worst-
residual tail.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-18 16:02:51 +00:00
..
src/domain slice S-B13: skip cylinder + primary HW losses for instantaneous systems 2026-05-18 16:02:51 +00:00
pyproject.toml slice 13: to_rows(properties) returns pd.DataFrame 2026-05-16 16:43:28 +00:00
README.md added potential file scaffolding: 2026-05-15 10:56:53 +00:00

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/.