functionpW_TDewPoi_amb
Function to compute the water vapor partial pressure for a given dew point temperature of moist air
Extends from Modelica.Icons.Function (Icon for functions).
Information
Dew point temperature calculation for moist air between 0 degC and 30 degC.
The correlation used in this model is valid for dew point temperatures between 0°C and 30°C. It is an approximation to the correlation from 2005 ASHRAE Handbook, p. 6.2, which is valid in a wider range of temperatures and implemented in Buildings.Utilities.Psychrometrics.Functions.pW_TDewPoi. The approximation error of this simplified function is below 5% for a temperature of 0°C to 30°C. The benefit of this simpler function is that it can be inverted analytically, whereas the other function requires a numerical solution.
Inputs
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Temperature | T | Dew point temperature |
Outputs
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Pressure | p_w | Water vapor partial pressure |
Revisions
-
October 4, 2014, by Michael Wetter:
Removedextends Buildings.Utilities.Psychrometrics.Functions.BaseClasses.pW_TDewPoi_ambas this gives a compile time error in OpenModelica as the input argumentTcannot be found. -
March 9, 2012 by Michael Wetter:
AddedsmoothOrder=99anddisplayUnitfor pressure. -
May 21, 2010 by Michael Wetter:
First implementation.