Model/packages/domain
Khalim Conn-Kowlessar 3fcec7ef22 slice S-A3: infiltration worksheet lines (6a)-(16) (SAP 10.3 §2)
Third slice of the SAP10 Calculator Session A (ADR-0009). Ports the SAP
10.2 / RdSAP10 §4.1 air-change-rate worksheet for the no-pressure-test
path. Returns an InfiltrationBreakdown carrying each named worksheet line
so callers can audit per SAP convention:

  (8)  openings_ach        — Table 2.1 rate × count / volume
  (10) additional_ach      — (storey_count − 1) × 0.1
  (11) structural_ach      — 0.25 steel/timber-frame, 0.35 masonry
  (12) floor_ach           — 0.2 unsealed timber / 0.1 sealed / 0
  (13) draught_lobby_ach   — 0.05 absent, 0.0 present
  (15) window_ach          — 0.25 − 0.2 × (pct_dp / 100)
  (16) total_ach           — sum of all of the above

Table 2.1 rates: open chimney 80, open flue 20, closed-fire chimney 10,
solid-fuel-boiler chimney 20, other-heater chimney 35, blocked chimney
20, intermittent fan 10, passive vent 10, flueless gas fire 40 (all
m³/hour per opening).

9 AAA cycles cover the baseline calculation, each Table 2.1 opening
contribution, frame-vs-masonry structural baseline, suspended-timber
floor sealed/unsealed split, draught-lobby presence, window draught-
proofing scale, multi-opening aggregation, and volume_m3 ≤ 0 validation.

Pressure-test override (worksheet lines 17-21) and mechanical-ventilation
adjustments (Table 4g, n_eff formula §2.6.6) are out of scope for this
slice — separate later slices per ADR-0009.
2026-05-17 22:00:10 +00:00
..
src/domain slice S-A3: infiltration worksheet lines (6a)-(16) (SAP 10.3 §2) 2026-05-17 22:00:10 +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/.