Figure 1, is for standard atmospheric pressure (14.7 psi) and temperatures of 30° to 120☏, which is adequate for most greenhouse or livestock housing applications. Psychrometric charts are available in various pressure and temperature ranges. Properties of moist air are explained in the Definitions Sidebar for your reference during the following discussions. Three examples are used to illustrate typical chart use and interpretation. This article explains how characteristics of moist air are used in a psychrometric chart. Understanding psychrometric charts can help you visualize environmental control concepts, such as why heated air can hold more moisture or, conversely, how allowing moist air to cool will result in condensation. It can be very helpful in troubleshooting and finding solutions to greenhouse or livestock building environmental problems. Psychrometric Chart and Air CharacteristicsĪ psychrometric chart presents physical and thermal properties of moist air in a graphical form.
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