Thermal diffusion factors (TDFs) in binary Stockmayer model mixtures as well as real mixtures of four refrigerants with N2 and CO have been calculated by NEMD simulations. The results of the model mixtures show that the TDF increases with the two component dipole moment ratio, however it is not a sensitive function of the ratio of the moment of inertia and the intermolecular cutoff distance. The calculated TDFs in N2/CO–refrigerants mixtures were equal for less polar refrigerants, however the TDFs of CO mixtures increase more than that of the N2 mixtures with the dipole strength of the refrigerant.
