Annex60.Utilities.Psychrometrics.Functions.TDewPoi_pW

# .Annex60.Utilities.Psychrometrics.Functions.TDewPoi_pW

Function to compute the water vapor partial pressure for a given dew point temperature of moist air

## Information

Dew point temperature calculation for moist air above freezing temperature.

The correlation used in this model is valid for dew point temperatures between 0°C and 200°C. It is the correlation from 2005 ASHRAE Handbook, p. 6.2. In an earlier version of this model, the equation from Peppers has been used, but this equation yielded about 15 Kelvin lower dew point temperatures.

#### Interface

>     function TDewPoi_pW
>       extends Modelica.Icons.Function;
>       input Modelica.SIunits.Pressure p_w(displayUnit = "Pa", min = 200) "Water vapor partial pressure";
>       output Modelica.SIunits.Temperature T "Dew point temperature";
>     end TDewPoi_pW;

## Revisions

- April 29, 2014 by Michael Wetter:
  Added dummy argument to `Internal.solve` to avoid a warning in Dymola 2015.
- March 9, 2012 by Michael Wetter:
  Added `smoothOrder=99` and `displayUnit` for pressure.
- February 17, 2010 by Michael Wetter:
  Renamed function from `dewPointTemperature` to `pW_TDewPoi`.
- February 6, 2010 by Michael Wetter:
  Fixed derivative implementation.
- September 4, 2008 by Michael Wetter:
  Changed from causal to acausal ports, needed, for example, for Annex60.Fluid.Examples.MixingVolumeMoistAir.
- August 7, 2008 by Michael Wetter:
  First implementation.

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