.BuildingSystems.Utilities.Psychrometrics.Functions.TDewPoi_pW

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.Units.SI.Pressure p_w(displayUnit = "Pa", min = 200) "Water vapor partial pressure";
  output Modelica.Units.SI.Temperature T "Dew point temperature";
end TDewPoi_pW;

Revisions

• February 28, 2020, by Michael Wetter:
  Replaced call to Media.Common.OneNonLinearEquation to use Modelica.Math.Nonlinear.solveOneNonlinearEquation because Media.Common.OneNonLinearEquation will be obsolete in MSL 4.0.0.
  This is for issue 1299.
• 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 BuildingSystems.Fluid.Examples.MixingVolumeMoistAir.
• August 7, 2008 by Michael Wetter:
  First implementation.