density as function of pressure and specific enthalpy
function rho_props_ph extends Modelica.Icons.Function; input Units.SI.Pressure p "pressure"; input Units.SI.SpecificEnthalpy h "specific enthalpy"; input ThermoSysPro.Properties.WaterSteam.Common.IF97TwoPhaseAnalytic aux "auxiliary record"; output Units.SI.Density rho "density"; end rho_props_ph;