// multi-utility computation suite · offline · instant · precise
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eng.HVAC-psychrometrics-enthalpy Calculator
Calculates moist air psychrometric properties from dry-bulb temperature and relative humidity using psychrometric equations. The psychrometric chart shows all moist air states — HVAC systems move air from one state to another by adding or removing heat and moisture.
Inputs
T Dry C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
T Wet C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
P Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Results
specific enthalpy h (kJ/kg dry air)
Sample size or count used in the calculation.
humidity ratio W (kg/kg)
The proportional relationship between two quantities.
relative humidity RH (%)
The value at the specified point or condition.
h = 1.006·Tdb + W·(2501 + 1.86·Tdb)
Reference formula or conversion factor shown for context.