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Khalim Conn-Kowlessar c0afe3592f slice S-A5e: monthly space-heating requirement (SAP 10.3 Table 9c step 10) 
Ninth slice of the SAP10 Calculator Session A (ADR-0009). Ships
monthly_heat_requirement_kwh implementing the Table 9c step-10 formula:

    L_m       = H × (T_i,m − T_e,m)              (W)
    Q_heat,m  = 0.024 × (L_m − η_m × G_m) × n_m  (kWh)

with the table's clamp: Q_heat is set to 0 when negative or below 1 kWh
per month (summer months and well-insulated dwellings in shoulder
months).

The orchestrator (S-A6) iterates utilisation factor + mean internal
temperature until they converge before calling this function.

5 AAA cycles cover: typical-winter-month hand-computed worked example,
summer month with gains exceeding losses clamping to 0, gains-scaling
direction check, external-temperature direction check, and the sub-1-kWh
clamp per the Table 9c note.
2026-05-18 09:00:05 +00:00
..
domain slice S-A5e: monthly space-heating requirement (SAP 10.3 Table 9c step 10) 2026-05-18 09:00:05 +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/.