Humid Air   

Humid Air



Humid air always contains dry air and steam. Once the saturation is exceeded water droplets and ice occur. The calculations presented are limited to relative saturation up to 100%. In good approximation dry air and steam can be regarded as ideal gases. The calculations are valid for humid air at ambient pressure and temperatures between 5 - 70 [°C].
  1. Enter volume flow of humid air. Mass flow of dry air is assumed to stay constant.
  2. Enter temperature of humid air.
  3. Enter ambient pressure.
  4. Enter relative humidity.
Missing values for state 2 will automatically be completed with values of state 1.
The dew point of a humid air is the temperature at which its realive humidity reaches 100%. Relative humidity equals 100%, if the partial pressure of steam equals its saturation pressure.

Means of Calculation
Humid Air 1* Humid Air 2 Delta
Volume flow m³/h
Ambient temperature ºC
Ambient pressure mbar,abs
relative humidity %
Saturation pressure steam mbar,abs
Partial pressure water vapour mbar,abs
Partial pressure dry air mbar,abs
Density humid air kg/m³
Mass water vapour / Mass dry air (x) kg/kg
Mass water vapour / Volume humid air kg/m³
Mass dry air / Mass humid air kg/kg
dew point ºC
mass flow dry air kg/h
mass flow water vapour kg/h
mass flow kg/h
enthalpy / Mass dry air (h1+x) kJ/kg
heat flow kW




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