GetSatVapPres: Return saturation vapor pressure given dry-bulb temperature.
In psychrolib: Psychrometric Properties of Moist and Dry Air
Description
Usage
Arguments
Value
Note
References
Examples
Description
Return saturation vapor pressure given dry-bulb temperature.
Usage
1
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
1
2
3
4
5
SetUnitSystem("IP")
GetSatVapPres(80:100)
SetUnitSystem("SI")
GetSatVapPres(20:30)
psychrolib documentation built on May 29, 2021, 9:11 a.m.
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Description Usage Arguments Value Note References Examples
Description
Return saturation vapor pressure given dry-bulb temperature.
Usage
1 | 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
1 2 3 4 5 | SetUnitSystem("IP")
GetSatVapPres(80:100)
SetUnitSystem("SI")
GetSatVapPres(20:30)
|
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Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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