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MoistAir, error in massFraction_pTphi #4058

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MoistAir, error in massFraction_pTphi#4058
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hubertus65
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L: MediaIssue addresses Modelica.Media
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MSL4.2.0
@GaelEnee

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@GaelEnee
GaelEnee
opened on Nov 15, 2022

Hello,

I would like to report an error in Modelica.Media.Air.MoistAir.massFraction_pTphi.

I suggest the replacement of :

protected 
  constant Real k=0.621964713077499 "Ratio of molar masses";
  AbsolutePressure psat=saturationPressure(T) "Saturation pressure";
algorithm 
  X_steam := phi*k/(k*phi + p/psat - phi);

by :

protected 
  AbsolutePressure psat=saturationPressure(T) "Saturation pressure";
algorithm 
  X_steam := phi*k_mair/(p/psat - phi);

Thanks !

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