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Prediction of forced convective condensation of non-azeotropic refrigerant mixtures inside enhanced surface tubing

Abstract:

In this paper, an experimental study on the heat transfer characteristics of two phase flow condensation of pure refrigerants such as R-12 and R-22 as well as non-azeotropic refrigerant mixtures R-22/R-114 and R-22/R-152a on horizontal enhanced surface tubing is presented. The enhanced surface tubing data showed a significant enhancement of the heat transfer compared to an equivalent smooth tube depending on the mixture components and their concentrations. Correlations were proposed to predict the heat transfer characteristics such as average heat transfer coefficients as well as pressure drops of non-azeotropic refrigerant mixture flow condensation inside enhanced surface tubing. In addition, it was found that the refrigerant mixture's pressure drop is a weak function of the mixture composition. © 1993 Kluwer Academic Publishers.