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Appendix J equations J6, J7, J8. Daily hot water for bath fills depends
on N, presence of bath and/or shower, and monthly Tcold:
N_bath = 0 if no bath but a shower exists
= 0.13×N + 0.19 if bath + shower
= 0.35×N + 0.50 otherwise
V_d,bath[m] = N_bath × 73 × J5_fbeh[m] × (42−Tcold[m])/(52−Tcold[m])
Tables J1 (mains + header tank Tcold) and J5 (behavioural factor) are
exported as module constants for reuse by (42a)m showers next.
Validated against the Elmhurst non-RR fixtures, both with bath + shower
and "Cold Water Source: From mains":
- 000490 N=2.1468 → Jan V_d,bath = 27.3868
- 000474 N=1.8896 → Jan V_d,bath = 25.4345
Also covers the zero-bath branch and the 5% low-water-use reduction.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| 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/.