A model for the condensation heat transfer of binary refrigerant mixtures

Abstract

In the present work turbulent film condensation of nonazeotropic binary mixtures inside a horizontal tube is studied theoretically. The combined heat and mass transfer involved is analyzed through an integral formulation of the continuity, momentum, energy and diffusion equations. As the mass velocity of refrigerant mixtures increases, the condensation heat transfer coefficient increases. The heat transfer coefficient becomes smaller at higher mass quality. As the mole fraction of the more volatile component in binary mixtures increases, the back-diffusion mass flux of the more volatile component reduces in the vapor. As a result the condensation heat transfer coefficient improves with the increase of the inlet mole fraction of the more volatile component especially in the upstream of condenser. The results of the present study show good agreement with the experimental data available.