Otto 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

t2-048

Effect

Computation or source lookup only

Input and validation requirements

The specification does not state input validation for r<=0 or for the physically invalid range r<1. r=0 causes division by zero, while r<1 produces a mathematically defined but physically invalid negative efficiency. The compression-ratio direction convention is also not stated, allowing the ratio to be inverted and producing a radically different result.

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": {
    "r": 8,
    "gamma": 1.4,
    "Qin": 1000,
    "Qin_units": "kJ/kg"
  },
  "expected_outputs": {
    "eta": 0.5647247184,
    "net_work": 564.7247184,
    "net_work_units": "kJ/kg"
  },
  "working": "γ−1 = 1.4−1 = 0.4. 8^0.4 = 2.297396709. 1/8^0.4 = 0.4352752816. η = 1−0.4352752816 = 0.5647247184. w_net = η·q_in = 0.5647247184·1000 = 564.7247184 kJ/kg."
}

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-tranche2/tranche2-results.json