Moist Air Enthalpy Calculator

Inspectable records

Ledger state

The current ledger marks this instrument verified clean within the source-bound verification corpus.

Area

Thermodynamics, Fluids & Aero

Tranche

tranche-4

Evidence ID

t4-072

Ledger rows

1

No ledger note is attached.

Review findings

The formula can pass for explicitly supplied T in degrees Celsius and W in kg/kg dry air. The catalog entry is not complete because it also advertises RH as an input without specifying pressure, saturation-pressure calculation, or conversion behavior. The empty honest_label should be replaced with wording such as: approximate moist-air enthalpy per kg dry air; T in degrees Celsius; W in kg/kg dry air; RH input requires pressure and a psychrometric model.

Formula and scope findings

• The formula h=1.006T+W(2501+1.86T) is the standard approximate moist-air enthalpy formula when T is dry-bulb temperature in degrees Celsius and W is humidity ratio in kg water vapor per kg dry air.
• The input declaration says W or RH, but no relative-humidity conversion formula is provided. Converting RH to W requires total pressure and a saturation-vapor-pressure model, so RH alone is insufficient.

Unit assumptions

• T must be in degrees Celsius, not kelvin or degrees Fahrenheit.
• W must be a dimensionless mass ratio in kg water vapor/kg dry air; it must not be entered as percent or directly as g/kg without conversion.
• The output h is in kJ/kg dry air.
• The empirical constants imply the usual psychrometric reference state and approximation; the reference convention should be documented if high accuracy is claimed.
• If RH is accepted, total barometric pressure and the saturation-vapor-pressure correlation must also be specified.

Boundary hardening

BREAK_CLAIMED · SELF_FLAGGED

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.

Errata and corrections

No applied erratum is attached to this unique-name record.

Inspectable example

4 review vectors are recorded. One source-bound sample is shown below.

{
  "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"
}

Related workflows

Sources and evidence

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

• VERIFIED_LEDGER.json · VERIFIED_CLEAN
• evidence-tranche4/tranche4-results.json
• BOUNDARY_HAZARD_CATALOG.json