This function calculates the derivative of temperature w.r.t. time. It is used as derivative function for T_props_ph.
function T_ph_der extends Modelica.Icons.Function; input Modelica.Units.SI.Pressure p "pressure"; input Modelica.Units.SI.SpecificEnthalpy h "specific enthalpy"; input Common.InverseDerivatives_rhoT derivs "auxiliary record"; input Real p_der "derivative of pressure"; input Real h_der "derivative of specific enthalpy"; output Real T_der "derivative of temperature"; end T_ph_der;