Derivative function of T_ph
function T_ph_der extends Modelica.Icons.Function; input SI.Pressure p "Pressure"; input SI.SpecificEnthalpy h "Specific enthalpy"; input Common.IF97BaseTwoPhase properties "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;