The Psychrometric chart is a graphical representation of the Psychrometric properties of air. The use of a Psychrometric chart enables air conditioning design engineers to plot and analyse various processes. A solution to many problems can be found without having to carry out long and complicated calculations.
The Psychrometric chart looks complicated with many lines and curves. It is easy to understand if you know the basic properties of air. You will soon appreciate its value when using it. There are no formulae required to find the properties of air under different conditions. All you need to know are two parameters of the air and the rest can be easily found on the chart.