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If Relative humidity is selected (the default), set the External relative humidity, φext and the External temperature, Text (used for the computation of the vapor saturation pressure). For User defined, enter values or expressions. Else, select an Ambient relative humidity and an Ambient temperature defined in the Ambient Settings section of a Heat Transfer or Heat Transfer in Shells interface. Convective moisture flux is defined by g0 = β(φextpsat(Text) − φpsat(T)).
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If Partial vapor pressure is selected, enter an External partial vapor pressure, pv,ext. Convective moisture flux is defined by g0 = β(pv,ext − φpsat(T)).
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