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With PsyCalc you can specify which two psychrometric properties are to be entered for an airstream and which psychrometric properties you wish to see as output. In the Mixing mode air flow units are specified also.
The four psychrometric property input boxes can accept six different types of input values. The table below lists the available selections:
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Description
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English
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Metric
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Dry Bulb Temperature
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ºFdb
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ºCdb
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Wet Bulb Temperature
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ºFwb
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ºCwb
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Relative Humidity
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% RH
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% RH
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Dew Point Temperature
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ºFdp
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ºCdp
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Humidity Ratio*
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gr/lb
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g/kg
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Enthalpy*
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Btu/lb
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kJ/kg
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* these properties are evaluated on a dry air basis
Specifying properties is done by selecting the unit of measure for that property in the drop down box to the right of the value input box. Click the down arrow to see what unit options are available. Click the unit of measure to select it and recalculate the output values.
If the selection of a different unit of measure results in a set of psychrometric properties that is greater than the saturate curve or less than the zero moisture content an "EXCEEDS LIMITS" message is displayed. Simply adjust one or both values to clear the message. The "EXCEEDS LIMITS" message is also displayed if the program is asked to calculate beyond its own calculation limits.
The four output boxes can display eleven different psychrometric properties. These are listed below:
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Description
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English
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Metric
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Dry Bulb Temperature
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ºFdb
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ºCdb
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Wet Bulb Temperature
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ºFwb
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ºCwb
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Relative Humidity
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%RH
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%RH
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Dew Point Temperature
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ºFdp
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ºCdp
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Humidity Ratio*
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gr/lb
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g/kg
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Enthalpy*
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Btu/lb
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kJ/kg
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Specific Volume*
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Ft³/lb
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m³/kg
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Vapor Pressure
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in Hg VP
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mm Hg VP
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Parts per Million by weight
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PPMw
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PPMw
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Parts per Million by volume
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PPMv
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PPMv
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Absolute Humidity
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gr/ft³
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g/m³
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* these properties are evaluated on a dry air basis
In the Mixing Calculator Volumetric flow rate values are required to perform the calculations. The unit selection available for these inputs are:
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Type
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English
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SI
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Standard
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SCFM
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SCMH
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Actual
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ACFM
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ACMH
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All input values may be typed directly into their respective text boxes or changed using the Spin Button adjacent to their text box.
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