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Khalim Conn-Kowlessar a3c687f1b0 §4 slice 6: lines (45)m energy content + (46)m distribution loss 
(45)m = 4.18 × V_d,m × n_m × (52 − Tcold[m]) / 3600    [kWh/month]
                                          Appendix J equation J14
  (46)m = 0.15 × (45)m                    spec §4 step 7 (normal systems)
        = 0                                (instantaneous at point of use,
                                            hot water codes 907 / 909)

4.18 J/(g·K) is the specific heat of water; / 3600 converts to kWh. The
J14 transform converts daily L of hot water at delivery temperature into
the monthly sensible-heat requirement.

Both Elmhurst non-RR fixtures use a combi boiler from a central system
(neither 907 nor 909), so distribution loss is the full 15 % of (45)m.
Lodged LINE_45_M and LINE_46_M arrays on both fixtures for forward use.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-20 15:58:40 +00:00
..
domain §4 slice 6: lines (45)m energy content + (46)m distribution loss 2026-05-20 15:58:40 +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/.