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Khalim Conn-Kowlessar aff678e8eb §4 slice 1: assumed_occupancy (worksheet line (42), Appendix J) 
First slice of the §4 worksheet-driven rewrite (xlsx rows 207-304).
New module `domain/sap/worksheet/water_heating.py` lands the line-ref
mapped functions; subsequent slices append below.

`assumed_occupancy(tfa)` implements the SAP10.2 Appendix J Table 1b
piecewise formula. Validated against:
  - canonical xlsx worked example  (TFA Q23 → N U209)
  - Elmhurst U985-0001-000474       (TFA 56.79 → N 1.8896)
  - Elmhurst U985-0001-000490       (TFA 66.06 → N 2.1468)
  - boundary case TFA ≤ 13.9        (N=1 floor)

The legacy `domain.ml.demand._default_occupants_sap_j` mirror stays in
place until the §4 worksheet rewrite is complete; both sources will be
reconciled in a later slice once dependent callers move over.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-20 15:27:03 +00:00
..
src/domain §4 slice 1: assumed_occupancy (worksheet line (42), Appendix J) 2026-05-20 15:27:03 +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

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/.