Stirling Cycle Efficiency 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

t4-036

Effect

Computation or source lookup only

Input and validation requirements

The calculator must reject V1=0 because the volume ratio divides by zero and the logarithm is undefined. It also needs explicit unit handling for absolute temperature; interpreting Celsius values as kelvin gives a wrong efficiency.

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": {
    "Th": 600,
    "Tc": 300,
    "V1": 1,
    "V2": 2,
    "n": 1,
    "temperature_unit": "K",
    "volume_unit": "L"
  },
  "expected_outputs": {
    "η": 0.5,
    "net_work_per_cycle_J": 1728.85
  },
  "working": "η=1−Tc/Th=1−300/600=1−0.5=0.5. Wnet=nR(Th−Tc)ln(V2/V1)=1×8.314×(600−300)×ln(2/1)=8.314×300×0.693147=2494.2×0.693147=1728.85 J/cycle."
}

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