.ThermofluidStream.Media.XRGMedia.R134a_ph.fres_R134a

Information

This function computes the residual helmholtz derivatives of the fundamental equation of Tillner-Roth and Baehr for R134a (1994) w.r.t. to reduced temperature (tau=T_crit/T) and reduced density (delta=rho/rho_crit). The function can be used for special properties depending just on the residual derivative parts.

Interface

function fres_R134a
  extends Modelica.Icons.Function;
  input Real delta "reduced density (delta=d/dcrit)";
  input Real tau "reduced temperature (tau=Tcrit/T)";
  output Common.HelmholtzDerivs f "helmholtz derivatives";
end fres_R134a;

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