density as function of pressure and specific enthalpy
function rho_props_ph extends Modelica.Icons.Function; input SI.Pressure p "pressure"; input SI.SpecificEnthalpy h "specific enthalpy"; input ThermalSeparation.Media.WaterBasedLiquid.BaseClasses.Common.IF97BaseTwoPhase properties "auxiliary record"; output SI.Density rho "density"; end rho_props_ph;