Calculates time derivative of temperature_ph
function temperature_ph_der extends Modelica.Icons.Function; input AbsolutePressure p "Pressure"; input SpecificEnthalpy h "Specific enthalpy"; input FixedPhase phase = 0 "2 for two-phase, 1 for one-phase, 0 if not known"; input Real der_p "Time derivative of pressure"; input Real der_h "Time derivative of specific enthalpy"; output Real der_T "Time derivative of density"; end temperature_ph_der;