Methodology
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The methodology
The 18 papers
All 18 HEM technical papers, and how much of each we implement.
docs/hem · ANALYSIS.md §2
Core, wrappers & timestep
Why a HEM run is a full-year simulation and not a formula.
HEM-TP-01 · TP-02
Airflow network
The BS EN 16798-7 mass balance, wind segments and the two nested solves.
HEM-TP-06 · ventilation.ts
The implementation
Calculation chain
Module call graph: foundations, physics, the htc.ts junction, product questions.
packages/hem/src
Element resistance stacks
The six element kinds, and why four of them are not area x U-value.
HEM-TP-05 · fabric.ts
Discrepancies
Six places the papers and the reference engine disagree, and which we follow.
ANALYSIS.md §4 · constants.ts
Scope boundary
What may be called a HEM figure, what may not, and what is absent entirely.
ANALYSIS.md §3
Worked example
The 1930s semi fixture end to end, reproducible with one command.
fixtures/semi-detached-1930s.json
HEM calculations
Fabric, ventilation and bridging into HTC and HLP, with a worked example.
packages/hem · HEM-TP-04/05/06
Fabric breakdown
Per-element W/K for the 1930s semi fixture, and the two non-obvious U-values.
packages/hem/fixtures
The product
Inference ladder
Survey answers to a HEM dwelling, and how every value shows its working.
packages/hem/src/inference
Assessment pipeline
Capture to report, and how input provenance is tracked.
product
Grade & improvement path
The A-G ramp and how measures move the marker via HTC.
DESIGN.md · product
Blank canvas
Empty scene for ad-hoc sketching.
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