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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
..
domain slice S-A3: infiltration worksheet lines (6a)-(16) (SAP 10.3 §2) 2026-05-17 22:00:10 +00:00
fetchers added potential file scaffolding: 2026-05-15 10:56:53 +00:00
repos added potential file scaffolding: 2026-05-15 10:56:53 +00:00
utils added potential file scaffolding: 2026-05-15 10:56:53 +00:00
README.md added potential file scaffolding: 2026-05-15 10:56:53 +00:00

README.md

Shared packages

Workspace packages consumed by services/*. Each package is its own Python distribution with its own pyproject.toml; services import via the workspace dependency mechanism ({ workspace = true }).

Package Purpose
domain/ Shared domain types — Property, BaselinePerformance, Plan, Scenario, EpcPropertyData, etc. No persistence, no IO, no business logic.
repos/ Persistence layer — one repo per aggregate. Owns the SQL. Depends on domain.
fetchers/ External API clients (gov EPC, Ofgem, Google Solar, etc.). Depend on domain for response shapes.
utils/ Cross-cutting infra — logging, S3, CloudWatch URL builders, SQS task helpers.

Adding a new shared package

Only when a real second consumer materialises. Don't pre-shatter (repos-epc, repos-property, ...) — split when a deployment needs to drop a dep, not before.

See ../ara_backend_design.md §11 for the broader monorepo layout and ../CONTEXT.md for the domain glossary that names the types living in domain/.