Psychrometric properties of moist and dry air. PsychroLib is a library of functions to enable the calculation of One set of psych equations is the PsychroLib project: i.e., you can inspect the formulae, coefficient values, etc. These could be suitable for use directly, or at least as points of reference if for some reason you need to create your own. There are existing software libraries of psychrometric functions available. Of course heat capacities are not temperature-independent constants, but the result will be fairly correct. $$p = 611 \exp\left( \frac = 1.926$kJ/kgK heat capacity of wapor at constant pressure. If you want to do approximate calculations, you can do the following:įor saturated vapor pressure (100% humidity line) you can use one of many approximate functions: Data in the psychrometric charts are essentially experimental.
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