Fourier Conduction (Plane Wall) Calculator implementation

Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

Record owner

Guth Instruments

Lifecycle

verified-clean

Evidence ID

t4-108

Effect

Computation or source lookup only

Input and validation requirements

The zero-thickness input produces an undefined division-by-zero result and must be rejected. The specification also leaves the sign convention for ΔT and heat-flow direction unstated, allowing results that differ by sign.

Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

{
  "inputs": {
    "k_W_per_mK": 0.6,
    "area_m2": 2.5,
    "thickness_m": 0.1,
    "delta_T_K": 20
  },
  "expected_outputs": {
    "heat_rate_q_W": 300,
    "heat_flux_W_per_m2": 120
  },
  "working": "q = k·A·ΔT/L = 0.6·2.5·20/0.1 = 30/0.1 = 300 W. q'' = q/A = 300/2.5 = 120 W/m²."
}

Other records

Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

• VERIFIED_LEDGER.json
• evidence-tranche4/tranche4-results.json