Derivative function of h_pT
function h_pT_der extends Modelica.Icons.Function; input SI.Pressure p "Pressure"; input SI.Temperature T "Temperature"; input Common.IF97BaseTwoPhase aux "Auxiliary record"; input Real p_der "Derivative of pressure"; input Real T_der "Derivative of temperature"; output Real h_der "Derivative of specific enthalpy"; end h_pT_der;