GetMoistAirVolume {psychrolib}

Return moist air specific volume given dry-bulb temperature, humidity ratio, and pressure.

Description

Return moist air specific volume given dry-bulb temperature, humidity ratio, and pressure.

Usage

GetMoistAirVolume(TDryBulb, HumRatio, Pressure)

Arguments

TDryBulb

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

HumRatio

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

Pressure

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

Value

A numeric vector of specific volume of moist air in ft3 lb-1 of dry air [IP] or in m3 kg-1 of dry air [SI]

Note

In IP units, R_DA_IP / 144 equals 0.370486 which is the coefficient appearing in eqn 26.

The factor 144 is for the conversion of Psi = lb in-2 to lb ft-2.

References

ASHRAE Handbook - Fundamentals (2017) ch. 1 eqn 26

Examples

SetUnitSystem("IP")
GetMoistAirVolume(80:100, 0.02, 14.175)

SetUnitSystem("SI")
GetMoistAirVolume(20:30, 0.02, 95461)