HVAC Design

Psychrometric Processes


In HVAC design the fundamental requirement is to identify the processes that is being performed on the air. These processes can be plotted on a psychrometric chart.

A psychrometric chart is a graphical representation of the thermodynamic properties of moist air at a pressure of one atmosphere. Using this chart, engineers can solve problems without having to do long and tedious calculations.

The psychrometric charts shows the quantities of:

  • dry bulb temperature
  • wet bulb temperature (also known as saturation temperature)
  • dew point temperature
  • relative humidity
  • moisture content (also known as humidity ratio)
  • enthalpy (also known as total heat)
  • specific volume (the inverse of density)


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#9 16728 115St NW

Edmonton, Alberta

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(780) 476-9670

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