HVAC Design

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)