| GetSatVapPres {psychrolib} | R Documentation |
Return saturation vapor pressure given dry-bulb temperature.
Description
Return saturation vapor pressure given dry-bulb temperature.
Usage
GetSatVapPres(TDryBulb)
Arguments
TDryBulb |
A numeric vector of dry-bulb temperature in degreeF [IP] or degreeC [SI] |
Value
A numeric vector of vapor pressure of saturated air in Psi [IP] or Pa [SI]
Note
Important note: the ASHRAE formulae are defined above and below the freezing point but have a discontinuity at the freezing point. This is a small inaccuracy on ASHRAE's part: the formulae should be defined above and below the triple point of water (not the feezing point) in which case the discontinuity vanishes. It is essential to use the triple point of water otherwise function GetTDewPointFromVapPres, which inverts the present function, does not converge properly around the freezing point.
References
ASHRAE Handbook - Fundamentals (2017) ch. 1 eqn 5 & 6
Examples
SetUnitSystem("IP")
GetSatVapPres(80:100)
SetUnitSystem("SI")
GetSatVapPres(20:30)