function h_TX_der input Modelica.SIunits.Temperature T "Temperature"; input Modelica.SIunits.MassFraction X[nS] "Independent Mass fractions of gas mixture"; input Real dT(unit = "K/s") "Temperature derivative"; input Real[nS] dX(unit = "1/s") "Mass fraction derivative"; output Real h_der(unit = "J/(kg.s)") "Specific enthalpy derivative at temperature T"; end h_TX_der;