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2-33 Refrigeration and Air Conditioning Graphical Calculation of Properties of Moist Air Psychrometric properties can be obtained from a psychrometric chart. The chart which is most commonly used is the wversus hchart, i.e. a chart of moisture content or water vapour pressure versus enthalpy (on skew axes). The chart is normally constructed for a standard atmospheric pressure of 101.325 kPa. The typical layout of the chart can is shown in the AIRAH and ASHRAE charts attached. In this course we will use the AIRAH chart.
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