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Khalim Conn-Kowlessar e403e2302c slice S-A5c: heating utilisation factor η (SAP 10.3 Table 9a) 
Seventh slice of the SAP10 Calculator Session A (ADR-0009). Ships
utilisation_factor(*, total_gains_w, heat_loss_rate_w, time_constant_h)
implementing SAP 10.3 Table 9a:

  a  = 1 + τ / 15
  γ  = G / L
  if γ > 0 and γ ≠ 1:  η = (1 − γ^a) / (1 − γ^(a+1))
  if γ = 1:            η = a / (a + 1)
  if heat_loss_rate ≤ 0: η = 1   (dwelling in net surplus)

η caps the contribution of internal + solar gains when they outpace the
heat-loss rate. The orchestrator computes time_constant_h = TMP /
(3.6 × HLP) and passes it in here; that's a future slice.

5 AAA cycles cover: small γ → η ≈ 1, γ = 1 special-case formula,
zero/negative heat loss returning η = 1, large γ dropping η well below
0.5, and higher τ (more thermal mass) raising η for the same γ.
2026-05-18 08:38:03 +00:00
..
domain slice S-A5c: heating utilisation factor η (SAP 10.3 Table 9a) 2026-05-18 08:38:03 +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/.