![]() If the humidity is specified, there may be cases where the psychrometric conditions cannot be attained (the engine allows a 5% tolerance). If the humidity is allowed to float, then the engine will attempt to find a humidity that minimizes additional load gains. let the engine determine an optimal humidity). ![]() In Revit, the user must set the first two variables to a specified value, and the third he has the option to either set or allow to float (i.e. ![]() Psychrometric conditions are controlled by three variables: supply air temperature, set point, and humidity (which Revit allows to float). The various equations themselves are beyond the scope this paper but a brief overview of the process follows. By calculating these various saturations we can determine the necessary airflows, entering and leaving air temperatures, and equipment loads of the zone. Psychrometric calculations use thermodynamic properties to analyze conditions and processes involving moist air.
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