In-tube condensation heat transfer of refrigerant mixtures
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Heat transfer coefficient and pressure-drop data were taken during in-tube condensation of refrigerant mixtures in a smooth copper tube. The data were taken at 30°C and 40°C. Five nonazeotropic refrigerant mixtures and pure R-125 were tested and compared against baseline data for R-22. Four different mass fluxes ranging from 125 to 375 kg/s·m2 were tested. The heat transfer coefficients of all the refrigerants decreased with increasing temperature. Also, all the refrigerants tested had lower heat transfer coefficients than R-22 when compared on an equal heating capacity basis. The equal heating capacity basis makes it easier to compare refrigerants with widely different enthalpies of vaporization.
author list (cited authors)
Doerr, T. M., Eckels, S. J., & Pate, M. B.