Source: https://guthlabs.ai/docs/instruments/moist-air-enthalpy-calculator/implementation/

instrument implementation / implementation-contract

# Moist Air Enthalpy Calculator implementation

A source-bound implementation contract for Moist Air Enthalpy Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## 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**: t4-072

**Effect**: Computation or source lookup only

## Input and validation requirements

An extreme but representable JavaScript input causes the enthalpy multiplication to overflow to Infinity. The calculator should reject or explicitly flag this result rather than treating it as a valid physical enthalpy. A separate unit-convention ambiguity also permits materially different physical interpretations.

## 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": {
    "T_C": 25,
    "W_kg_per_kg_dry_air": 0.01
  },
  "expected_outputs": {
    "h_kJ_per_kg_dry_air": 50.625
  },
  "working": "h=1.006(25)+0.010[2501+1.86(25)]\n=25.150+0.010[2501+46.500]\n=25.150+0.010(2547.500)\n=25.150+25.475\n=50.625 kJ/kg dry air"
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/moist-air-enthalpy-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/moist-air-enthalpy-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/moist-air-enthalpy-calculator/qualification/>)

## 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`