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Khalim Conn-Kowlessar 1dcbdb28e6 §4 slice 4: hot_water_mixer_showers_monthly_l_per_day (line (42a)m) 
Appendix J equations J1–J3. Per-day hot water draw for mixer showers
combines the per-day shower count (rising with N, depressed slightly
when a bath is also present) with each outlet's flow × 6 min × Table J5
behavioural factor, then multiplied by the cold-water-dependent hot
fraction (41 °C delivery vs 52 °C hot supply, Tcold from J1).

Multi-outlet handling: N_shower is split across outlets so a dwelling
with two identical mixers produces the same (42a)m total as a single
outlet — the count only matters when outlets have different flow rates.
Instantaneous electric showers belong in (64a)m and must be excluded
from the input.

Validated against the Elmhurst non-RR fixtures (both 1 vented mixer at
7 L/min, mains Tcold):
  - 000490 N=2.1468 → Jan V_d,hot = 52.6878
  - 000474 N=1.8896 → Jan V_d,hot = 48.9139

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-20 15:51:14 +00:00
..
domain §4 slice 4: hot_water_mixer_showers_monthly_l_per_day (line (42a)m) 2026-05-20 15:51:14 +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/.