New IAPWS models for the calculation of water properties above and below freezing.New constants for the universal gas constant based on CODATA and a revised molar mass of dry air to account for the increase of CO2 in Earth's atmosphere.Revised chapters for wet-bulb temperature and relative humidity and a revised Appendix V that includes a summary of ASHRAE Research Project RP-1485.
Understanding Psychrometrics serves as a lifetime reference manual and basic refresher course for those who use psychrometrics on a recurring basis and provides a four- to six-hour psychrometrics learning module to students air-conditioning designers agricultural, food process, and industrial process engineers meteorologists and others. Individuals may also click on the following links using their mobile device: To download, iPhone/iPad users should visit the App Store and search for "ASHRAE App".
Email a list of all the points and their properties for a completed chart, along with a PDF of the chart itself.Also, create custom labels anywhere on the chart.
The following section will explain how to locate the seven properties of air.The ASHRAE Psych Chart app includes the following features and functionality: The state point is the junction of any two property lines, Figure 23.1. To find the values for the properties of air, you must be able to locate what is called the state point. The recommended practice is to interpolate only one decimal point beyond the scale.Ī psychrometric chart has a scale and lines for each property. Note: the scales for each property of air are different and the number of graduations for each scale is not the same. To complete the activities of this section you should obtain a normal temperature psychrometric chart. In addition, charts are produced for special purposes. It is common to see high temperature, normal temperature, and low temperature charts. Dry bulb, wet bulb, and saturation temperature scales.Ĭharts are used. If a different chart is used the values may be different. 1791 Tullie Circle, NE, Atlanta, Georgia, 30329. Obtain from American Society of Heating, Refrigerating and Air-conditioning Engineers, Inc.
Differentġ An ASHRAE PSYCHROMETRIC CHART NO.
A psychrometric chart is designed so that if any two properties of the air are known, values for the other five properties can be found on the chart.