Degree-Day Energy Estimator 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

t5-173

Effect

Computation or source lookup only

Input and validation requirements

Zero efficiency produces an undefined division and must be rejected; additionally, an unspoken Fahrenheit-versus-kelvin degree-day convention can change the result from 166.6666667 kWh to 300 kWh for the same numeric input.

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": {
    "mode": "heating",
    "UA_W_per_K": 250,
    "HDD_degree_days_C": 1800,
    "efficiency_eta": 0.9
  },
  "expected_outputs": {
    "seasonal_energy_Wh": 12000000,
    "seasonal_energy_kWh": 12000
  },
  "working": "UA·HDD·24/η = 250 W/K × 1800 K·day × 24 h/day ÷ 0.9 = 450000 W·day × 24 h/day ÷ 0.9 = 10800000 Wh ÷ 0.9 = 12000000 Wh = 12000 kWh."
}

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-tranche5/tranche5-results.json