The formulations used here are to calculate moist air properties based on perfect gas relations published in 1989 ASHRAE Fundamentals Handbook, which should be accurate. Nevertheless, it is strongly recommend that you compare the results calculated by this worksheet with a psychrometric chart. There is no error checking so you should use reasonable input values.

Enter the following:
  • Altitude
  • Dry Bulb
  • Relative Humidity
  • ...or Wet Bulb
  • ...or Dew Point





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Psychrometric Calculations
Psychrometric Calculations
Unit Chosen: SI IP
Altitude
Dry Bulb Temp.:
Relat. Humidity:  
Wet Bulb Temp.:
Dew Point Temp
Atmospheric Press
Sat. Vapor Press.
Partial Vapor Press.
Humidity Ratio
Enthalpy
Specific Volume