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8c21b399c6
Eighth slice of the SAP10 Calculator Session A (ADR-0009). Implements
SAP 10.3 mean internal temperature with three public helpers under
domain.sap.worksheet.mean_internal_temperature:
elsewhere_heating_temperature_c(hlp, control_type)
-> Table 9 T_h2 formula:
control type 1: T_h2 = 21 − 0.5 × HLP
control type 2 or 3: T_h2 = 21 − HLP + HLP² / 12
HLP clamped to 6.0 per Table 9 note (e).
off_period_temperature_reduction_c(t_off, T_h, T_e, R, G, H, η, τ)
-> Table 9b u value (°C drop below T_h over an off-period):
t_c = 4 + 0.25·τ
T_sc = (1−R)(T_h−2) + R·(T_e + η·G/H)
quadratic branch when t_off ≤ t_c, linear when t_off > t_c.
mean_internal_temperature_c(...)
-> Table 9c steps 1-8: living-area zone (off 7+8 h, T_h1=21°C) and
elsewhere zone (off 7+8 h for control 1/2 or 9+8 h for control 3,
T_h2 from above), blended by living_area_fraction, plus the
Table 4e control-type temperature adjustment.
Step 9 (re-compute utilisation factor with the new T_i) and step 10
(Q_heat = 0.024 × (L − η·G) × n_m) live in the next slice's monthly loop.
7 AAA cycles cover: T_h2 formulas for control types 1 vs 2, HLP > 6 clamp
per note (e), off-period u quadratic branch (t_off ≤ t_c), off-period u
linear branch (t_off > t_c), full mean_internal_temperature hand-computed
worked example, and control-type-3 longer first off-period dropping mean
temp slightly below control-type-2.
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|---|---|---|
| .. | ||
| domain | ||
| fetchers | ||
| repos | ||
| utils | ||
| 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/.