GetVapPresFromRelHum {psychrolib}

Return partial pressure of water vapor as a function of relative humidity and temperature.

Description

Return partial pressure of water vapor as a function of relative humidity and temperature.

Usage

GetVapPresFromRelHum(TDryBulb, RelHum)

Arguments

TDryBulb

A numeric vector of dry-bulb temperature in degreeF [IP] or degreeC [SI]

RelHum

A numeric vector of relative humidity in range [0, 1]

Value

A numeric vector of partial pressure of water vapor in moist air in Psi [IP] or Pa [SI]

References

ASHRAE Handbook - Fundamentals (2017) ch. 1 eqn 12, 22

Examples

SetUnitSystem("IP")
GetVapPresFromRelHum(77, seq(0.1, 0.8, 0.1))

SetUnitSystem("SI")
GetVapPresFromRelHum(20, seq(0.1, 0.8, 0.1))