.Buildings.Utilities.Psychrometrics.Functions.X_pW

Information

Function to compute the mass fraction for a given water vapor partial pressure.

Interface

function X_pW
  extends Modelica.Icons.Function;
  input Modelica.Units.SI.Pressure p_w(displayUnit = "Pa", min = 0.003, nominal = 1000) "Water vapor pressure";
  input Modelica.Units.SI.Pressure p = 101325 "Total pressure";
  output Modelica.Units.SI.MassFraction X_w(min = 0, max = 1, nominal = 0.01) "Species concentration at dry bulb temperature";
end X_pW;

Revisions

• February 14, 2021 by Ettore Zanetti:
  Updated description.
• September 16, 2013 by Michael Wetter:
  Added attributes to variable p_w.
• March 9, 2012 by Michael Wetter:
  Added smoothOrder=99 and displayUnit for pressure.
• February 17, 2010 by Michael Wetter:
  Renamed block from HumidityRatio_pWat to X_pW.
• April 14, 2009 by Michael Wetter:
  Converted model to block because RealInput are obsolete in Modelica 3.0.
• August 7, 2008 by Michael Wetter:
  First implementation.