Last edited 22 Sep 2020

Psychrometric charts

Psychrometric chart.png

Psychrometric charts are complex graphs that can be used to assess the physical and thermodynamic properties of gas-vapour mixtures at a constant pressure. They are often used to assess the properties of moist air. This can be useful in the design of heating, ventilation and air-conditioning systems for buildings, and psychrometric charts often include a zone in the middle that represents the range of conditions that people find comfortable under different circumstances (such as summer and winter).

Typically, the properties represented on psychrometric charts are:

The state of moist air can be determined from any two of these properties, from which all other properties can then be determined.

Atmospheric pressure varies with altitude and so a number of psychrometric charts are available for different atmospheric pressures, however, for altitudes of less than 600m the sea-level psychrometric chart is often considered adequate.

[edit] Related articles on Designing Buildings Wiki


Who is the author of this article? I cant find the name.

Designing Buildings Wiki is a wiki site – articles are developed over a period of time by our users. As such, there is no specific author. To reference an article on the site, just reference Designing Buildings Wiki as the publisher, and the date that you accessed it.

Designing Buildings Anywhere

Get the Firefox add-on to access 20,000 definitions direct from any website

Find out more Accept cookies and
don't show me this again