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Khalim Conn-Kowlessar feef819814 §4 slice 8: line (64)m output from water heater 
(64)m = max(0, (62)m + (63a)m + (63b)m + (63c)m + (63d)m)

The four (63 a-d) inputs are WWHRS, PV-diverter, solar HW and FGHRS
contributions — entered as negative quantities so the formula uses +,
not −. The max-clamp guards "if (64)m < 0 then set to 0" per the spec
worksheet text: a renewable-heavy summer can't show negative delivered
heat.

Both Elmhurst non-RR fixtures lodge zero for all four (no WWHRS, no PV
diverter, no solar, no FGHRS), so (64)m = (62)m for every month.
Validated end-to-end on both with abs=1e-3 kWh tolerance.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-20 16:08:18 +00:00
..
domain §4 slice 8: line (64)m output from water heater 2026-05-20 16:08:18 +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/.