Forced convective condensation and boiling of ternary non-azeotropic refrigerant mixtures inside water/refrigerant enhanced surface tubing

Abstract

In this paper, an experimental study on the heat transfer characteristics of two-phase flow condensation and boiling of ternary non-azeotropic refrigerant mixtures, on water/refrigerant 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 ternary non-azeotropic refrigerant mixture flow condensation, and boiling inside enhanced surface tubing. In addition, it was found that the refrigerant mixture's pressure drop is a weak function of the mixture's composition.