Model/domain/modelling/heating_rates.json at 6cb9800608ddb89af5841cbf3a12a55dc2c31338 - junte/Model - Forgejo: Beyond coding. We forge.

junte/Model

mirror of https://github.com/Hestia-Homes/Model.git synced 2026-07-12 13:29:04 +00:00

Khalim Conn-Kowlessar ae7e6a0c42 feat(modelling): composite per-dwelling boiler + tune-up costing (ADR-0027)

Replace the flat placeholder scalars (boiler £3000; tune-up £500/£900) with a
per-dwelling composite cost, mirroring the ASHP architecture (ADR-0025): a
`HeatingRates` table (data, `heating_rates.json`), typed `BoilerCostInputs` /
`TuneUpCostInputs`, pure `Products.boiler_bundle_cost` / `tune_up_cost`, and
modelling-layer interpreters that read the dwelling into those inputs.

The cost mirrors the Simulation Overlay component-for-component, sharing the
controls + cylinder pricing across both options:

- tune-up (standard) = standard controls + cylinder fixes
- tune-up (zone)     = zone controls + cylinder fixes
- boiler upgrade     = £3200 all-in + standard controls (only when the upgrade
  fired a controls change) + cylinder fixes

Standard controls are priced INCREMENTALLY — only the parts missing to reach
SAP 2106 (programmer £120 / room thermostat £150 / TRV £35×radiators), read
from a Table 4e Group-1 feature map so a dwelling that already has a room
thermostat + TRVs is only charged the programmer. Zone controls are a full
smart kit (hub £205 + smart TRV £50×radiators) — the smart TRV is itself the
room sensor, so there is no separate per-room sensor line. Cylinder fixes:
jacket £50 (when under-insulated) + thermostat £150 (when absent). The boiler
is a like-for-like wet swap (no radiators/flue/pipework — eligibility already
requires an existing wet boiler), so those dead-code extras are not modelled.

Figures are research-validated 2025/26 UK installed costs (legacy Costs.py
lineage); fully-loaded totals with one contingency on top (Model B, not the
legacy VAT/preliminaries engine). Contingency: boiler 0.26; tune-ups 0.10
(was a 0.15 placeholder). ADR-0027 records the design; CONTEXT.md's Heating
Eligibility entry updated to cover the partial boiler/tune-up family + composed
cost. Products cost pins (delta<=1e-9) + interpreter tests + generator
composite-cost assertions.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

2026-06-10 19:41:06 +00:00

10 lines

200 B

JSON

Raw Blame History

 {
   "programmer": 120,
   "room_thermostat": 150,
   "trv_per_radiator": 35,
   "zone_hub": 205,
   "smart_trv_per_radiator": 50,
   "cylinder_thermostat": 150,
   "cylinder_jacket": 50,
   "boiler": 3200
 }