It is based on ASHRAE correlations and is more than accurate enough for HVAC. The psychrometric chart is used in many other calculations related to heating or cooling of the air (Kodama et al. You show a 'Virtual' Temperature under Thermodynamic properties. Get Psyched will allow you to do psychrometric calculations in MS Excel. These properties are needed when you need to calculate 1) the time to turn your irrigation system on, 2) the time to turn your irrigation system off, and 3) the danger of frost damage (Parsons and Boman 2003). What is the difference between the six different humidity metrics shown? Why does this program show two different values of specific volume? There appears to be error in the calculations when converting from one unit system to User may override default input by selecting and entering new value. Site elevation for Dayton, OH - 997 ft amsl (306 m) based on the ASHRAE HOF. Sea Level Pressure - 14.7 psia / 101.3 kPa / 29.92 in Hg / 760 mm Hg (Default when 'ActualĪverage Barometric Pressure in Dayton, OH - 14.18 psia / 97.7 kPa / 28.86 in Hg / 733 mm Hg At the end of the calculation, the user has the option to convert from the English to the SI (or vice versa) unit system.
The user then enters a desiredĭry Bulb temperature and one of three humiditymetrics:ĭew Point temperature. To calculate properties, the user must enter either a site elevation (from which an average barometric pressure is calculated) or an actual barometric pressure.
It will also provide a number of other thermodynamic properties not found on a typical psychrometric chart. This on-line program calculates typical psychrometric state point properties. Instructions for the Psychrometric Calculator
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