a736db3f4a
Two HP-specific cascade gaps blocking cert 0380:
(a) Cavity wall + filled cavity + external insulation:
Cert 0380's `walls[0].description="Cavity wall, filled cavity and
external insulation"` with `wall_insulation_type=6` +
`wall_insulation_thickness="100mm"`. RdSAP 10 §4-4 (page 73) lists
"cavity plus external" as a distinct insulation type code (6 in
the API schema; 7 is "cavity plus internal"). The U-value is the
composite U = 1 / (1/U_filled + R_ins) per §5.8 page 40 + Table 14
R-value lookup, with the cascade-2-d.p. round matching the dr87
worksheet's column display.
For cert 0380: U_filled (age D)=0.7 + R_ins (100mm @ λ=0.04)=2.5
→ U_unrounded=0.2545 → rounded 0.25 (worksheet exact). Walls HLC
14.87 → 11.6150 (= worksheet 11.6150). (37) total fabric heat
loss 99.34 → **96.0889** (= worksheet 96.0889 EXACT).
Added `WALL_INSULATION_CAVITY_PLUS_EXTERNAL: Final[int] = 6` and
`WALL_INSULATION_CAVITY_PLUS_INTERNAL: Final[int] = 7` constants
+ `_WALL_INSULATION_LAMBDA_W_PER_MK = 0.04` default thermal
conductivity. New `u_wall` branch fires when cavity + composite
insulation type + non-zero thickness.
(b) SAP 10.2 Table 11 secondary fraction — missing cat-4 entry:
The dict `_SECONDARY_HEATING_FRACTION_BY_CATEGORY` had entries
for cats 1/2/3/5/6/7/10 but DID NOT include cat 4 (heat pump),
despite the inline comment explicitly noting "Cat 4 (heat pump):
0.00 (HP eff includes any secondary)". Cert 0380 lodges
`secondary_heating_type=691` + `main_heating_category=4` (HP,
PCDB idx 104568), so the cascade fell through to the DEFAULT
fraction 0.10 — billing 547 kWh × 13.19 p/kWh = £72 as
"secondary heating" that the worksheet correctly shows as £0.
Added `4: 0.00` to the dict.
Effect on cert 0380 API path:
- walls HLC 14.87 → 11.62 (worksheet exact)
- (37) total HLC 99.34 → 96.09 (worksheet exact)
- main_heating_cost £282 → £314 (worksheet £316)
- secondary_heating £72 → £0 (worksheet £0)
- sap_continuous 87.62 → 90.48 (Δ -0.89 → +1.97 — over-correcting
because hot-water cascade is still cascade-£66 vs worksheet £204
including electric shower; HP HW-COP + electric-shower cost are
the next slices).
No golden cert residual shifts (cohort certs don't lodge HP cat 4
or composite cavity+EWI walls).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| .devcontainer | ||
| .github/workflows | ||
| .idea | ||
| .vscode | ||
| applications | ||
| asset_list | ||
| backend | ||
| backlog | ||
| datatypes | ||
| deployment/terraform | ||
| docs/adr | ||
| domain | ||
| epr_data_exports | ||
| etl | ||
| infrastructure | ||
| model_data/requirements | ||
| orchestration | ||
| recommendations | ||
| repositories | ||
| scripts | ||
| sfr/principal_pitch | ||
| survey_report | ||
| tests | ||
| utilities | ||
| utils | ||
| .coveragerc | ||
| .dockerignore | ||
| .gitignore | ||
| __init__.py | ||
| ara_backend_design.md | ||
| BaseUtility.py | ||
| CLAUDE.md | ||
| conftest.py | ||
| CONTEXT.md | ||
| devcontainer.sh | ||
| Dockerfile.test | ||
| Dockerfile.test.dockerignore | ||
| Makefile | ||
| MEMORY.md | ||
| package-lock.json | ||
| package.json | ||
| pyproject.toml | ||
| pyrightconfig.json | ||
| pytest.ini | ||
| README.md | ||
| run_lambda_local.sh | ||
| serverless.yml | ||
| test.requirements.txt | ||
| tox.ini | ||
| UBIQUITOUS_LANGUAGE.md | ||
Model Repository
This repository contains the code pertaining to the development of the data science and machine learning products being utilised by Hestia.
The different folders in this repository relate to services that can be used independently, or can be imported and used as part of a larger application
Getting Started
Prerequisites
Dev Container Setup
This repo uses a Docker Compose-based dev container. The model-backend service joins a shared-dev Docker network so it can communicate with other local services (e.g. a frontend container) running on your machine.
VS Code users: The initializeCommand in devcontainer.json creates the shared-dev network automatically before the container starts. No manual step required — just open the repo and select Reopen in Container.
Non-VS Code / CI workflows: Run the following once before starting the container:
make dev-setup
This is idempotent and safe to re-run if the network already exists.
Folders
backend/
This folder contains the code for the fastapi backend service, which provides an interface to much of the functionality in this repository, for the frontend
model_data/
This folder contains related to the reading and preparation of assessment model data, including pulling out epc attributes
Testing
All tests can be run, against the configuration in pytest.ini running
pytest
This will run the complete panel of tests and report on coverage in the locations specified by the pytest.ini file.
To run tests in a specific service, e.g. inside of model_data, simply run
pytest --cov-config=model_data/.coveragerc --cov=model_data
This will produce the test results and coverage reports