GetHumRatioFromVapPres {psychrolib}

Return humidity ratio given water vapor pressure and atmospheric pressure.

Description

Return humidity ratio given water vapor pressure and atmospheric pressure.

Usage

GetHumRatioFromVapPres(VapPres, Pressure)

Arguments

VapPres

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

Pressure

A numeric vector of atmospheric pressure in Psi [IP] or Pa [SI]

Value

A numeric vector of humidity ratio in lb_H2O lb_Air-1 [IP] or kg_H2O kg_Air-1 [SI]

References

ASHRAE Handbook - Fundamentals (2017) ch. 1 eqn 20

Examples

SetUnitSystem("IP")
GetHumRatioFromVapPres(seq(0.4, 0.6, 0.01), 14.175)

SetUnitSystem("SI")
GetHumRatioFromVapPres(seq(3000, 4000, 100), 95461)