Internal energy
function u_pTX extends Modelica.Icons.Function; input Modelica.SIunits.AbsolutePressure p "Pressure"; input Modelica.SIunits.Temperature T "Temperature"; input Modelica.SIunits.MassFraction X[:] = Modelica.Media.Air.ReferenceMoistAir.reference_X "Mass fractions"; output Modelica.SIunits.SpecificEnergy u "Specific entropy"; end u_pTX;