.Annex60.Utilities.Psychrometrics.Functions.pW_TDewPoi

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 pW_TDewPoi
  extends Modelica.Icons.Function;
  input Modelica.SIunits.Temperature T(min = 100) "Dew point temperature";
  output Modelica.SIunits.Pressure p_w(displayUnit = "Pa", min = 100) "Water vapor partial pressure";
end pW_TDewPoi;

Revisions

• 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.