Public evidence

physics.thermo.thermal_resistance

Machine-checked verification for calculation version 1.0.0 · tier engine_tested

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Verification

16/16 calculation tests · Production surface contract 3/3

Golden tests 1 / 1
Boundary tests 9 / 9
Property tests 6 / 6
Production surface contract 3 / 3
Engine tested Yes
Source checked Yes
Artifact integrity PASS
Production attestation Embedded snapshot: STALE · Last attested schema matched 1.0.0 snapshot / local build · Semantic contract ✓ · Last attestation PASS · current evidence changed · re-attestation required · Public/cache ✓ · Origin ✓ · Live production status PASS (0 stale; 163 CURRENT) @ 2026-09-17T03:09:03.307Z
Semantic contract PASS
Evidence attested at 2026-09-17T03:09:02.494Z
Last production check 2026-09-17T03:09:02.494Z
Public / cache PASS
Origin PASS
Supplemental domain review Not performed
Named expert review Not performed

release artifacts aligned PASS
schema valid input executes PASS
engine success output validates schema PASS

Fingerprint sha256:353b48c1caebcd92a7a2c40982070b8d95734bd596acab1ca0044191d8b42671

Input schema sha256:c331e6933cc6a01f659c5664c757fb2628060083dde7c46f418b6ad0c73a1911 · Output schema sha256:2cc61d569661afa57c1e25d9fc267c2e3d71528b7b4e40c616d7bcd3ccb80cfe · Build-time SHA-256 digests prove published artifacts agree with each other (release_integrity.scope=workspace). Production attestation GETs canonical URLs twice (public/cached view and origin), including Capability HTML, via npm run attest:production --write (published at /.well-known/calculatorx-production-attestation.json) and fails if the public Capability page advertises a different calculation_version. This is artifact consistency, not an independent immutable release log.

Build & scope

Engine identity and declared limitations.

Tool: thermal-resistance
Engine: thermal-resistance
Engine build: 2026-09-17
Evidence core: 2026-09-17T01:45:52.481Z
Rendered: 2026-09-17T02:45:35.819Z
Last reviewed: —

Assumptions

Lumped thermal resistances; SI K/W
Series R=ΣR_i; parallel 1/R=Σ1/R_i; Q=ΔT/R
Not Fourier/Newton Q pages
Not heatsink θ, not steam, not radiation

Limitations

Lumped R; SI K/W
Series R=ΣR_i; parallel 1/R=Σ1/R_i; Q=ΔT/R when ΔT is given
Not Fourier/Newton Q (see /calc/physics/heat-transfer)
Not heatsink θJC/θSA, not steam, not radiation

Sources

Standards and references supporting this tool specification. Methods are listed separately — they are algorithms, not bibliographic sources.

Incropera, F.P. and DeWitt, D.P. Fundamentals of Heat and Mass Transfer — Thermal resistance networks
Supports: R_cond = L/(k A); R_conv = 1/(h A); series and parallel combination; Q = ΔT/R
ISO 80000-5 — Thermodynamics — Heat rate and temperature difference
Supports: Q is heat rate; R relates ΔT to Q

Published checks

Golden, boundary, and property cases included in this evidence build.

ID	Kind	Status	Detail
`golden-rth`	golden	pass	Expected R=0.25 · mode=conduction · model=thermal_resistance · Actual mode=conduction · R=0.25 · k=1 · A=2 · L=0.5 · model=thermal_resistance
`boundary-rth-q`	boundary	pass	Expected R=0.25 · Q=40 · Actual mode=conduction · R=0.25 · k=1 · A=2 · L=0.5 · model=thermal_resistance · dT=10 · Q=40
`boundary-rth-conv`	boundary	pass	Expected R=0.05 · mode=convection · Actual mode=convection · R=0.05 · h=10 · A=2 · model=thermal_resistance
`boundary-rth-series`	boundary	pass	Expected n=2 · R=0.3 · Actual n=2 · mode=series · R=0.3 · model=thermal_resistance
`boundary-rth-parallel`	boundary	pass	Expected R=0.041666666666666664 · Actual n=2 · mode=parallel · R=0.041666666666666664 · model=thermal_resistance
`boundary-rth-missing`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-rth-k0`	boundary	pass	Expected VALUE_MUST_BE_POSITIVE · Actual VALUE_MUST_BE_POSITIVE
`boundary-rth-mixed`	boundary	pass	Expected MIXED_INPUT_ENCODING · Actual MIXED_INPUT_ENCODING
`boundary-rth-one`	boundary	pass	Expected MISSING_REQUIRED_INPUT · Actual MISSING_REQUIRED_INPUT
`boundary-rth-ht`	boundary	pass	Expected INVALID_MODE · Actual INVALID_MODE
`property-rth-cond`	property	pass	L/(kA)=0.25
`property-rth-q`	property	pass	Q=ΔT/R
`property-rth-conv`	property	pass	1/(hA)=0.05
`property-rth-series`	property	pass	series 0.3
`property-rth-par`	property	pass	parallel 1/24
`property-rth-model`	property	pass	thermal_resistance