Online Enthalpy Calculator of Ambient air and Example Problems

Ambient air is a mixture of several gases and water vapour. We define these several gases as dry air. The enthalpy of ambient air depends on several factors. In this calculator option we have given you, you have to enter other known values to calculate the Enthalpy of ambient air. We will also discuss several examples of how to calculate the Enthalpy of ambient air in different conditions.




Online Calculator to calculate enthalpy of ambient air when dry bulb temperature and absolute humidity values are known

  • Pressure of ambient air = 1 bar
  • Reference temperature = 00C








Example of calculating enthalpy of dry air using equation

Enthalpy of air is the summation of enthalpy of 1kg of dry air and the enthalpy of associated water vapor in 1kg of dry air.



steps of calculating enthalpy of ambient air

Calculate enthalpy of ambient air at 300. Absolute humidity of that air is 0.01 kg of water vapour per 1 kg of dry air

  • Specific heat capacity of air = 1.005 kJ kg0 K-1
  • Latent heat of water at 00C = 2429.8 kJ kg-1
  • Specific heat capacity of water vapor = 1.8723 kJ kg-1 K-1


Equations used in calculating enthalpy of air

Enthalpy of air is a summation of enthalpy of 1kg of dry air and associated enthalpy of water vapor.


Enthalpy of air = Enthalpy of 1kg of dry air + Enthalpy of water vapour


Enthalpy of 1kg of dry air = Dry air mass x specific heat capacity of air x (Final Temperature - Reference Temperature)


Enthalpy of water vapour in 1kg of dry air = Latent Heat Difference + Sensible Heat Difference


Enthalpy of 1kg of dry air

  • Enthalpy of 1kg of dry air = Dry air mass x specific heat capacity of air x (Final Temperature - Reference Temperature)
  • Enthalpy of 1kg of dry air = 1 kg x 1.005 kJ kg0 K-1 x (303 - 273) K
  • Enthalpy of 1kg of dry air = 30.15 kJ

Enthalpy of water vapour

  • Enthalpy of water vapour in 1kg of dry air = Latent heat difference + sensible heat difference
  • Enthalpy of water vapour in 1kg of dry air = Absolute humidity x Latent heat + Absolute humidity x specific heat capacity of water vapor x (Final Temperature - Reference Temperature)
  • Enthalpy of water vapour in 1kg of dry air = 0.01 kg x 2429.8 kJ kg-1 + 0.01 kg x 1.8723 kJ kg-1 K-1 x (303 - 273) K
  • Enthalpy of water vapour in 1kg of dry air = 24.85 kJ

  • Enthalpy of air = 30.15 kJ + 24.85 kJ
  • Enthalpy of air = 55.00 kJ kg-1


Have Questions?






How to read psychrometric chart to calculate air properties Read dry bulb and wet bulb in psychrometric chart Calculate volume per 1kg of dry air using psychrometric chart Classifications and types of refrigerants Chemical properties of refrigerants