Heat transfer of ternary mixtures inside enhanced surface tubing

Two phase flow heat transfer parameters such as coefficient of heat transfer and pressure drop observed during condensation of ternary azeotropic refrigerant mixtures R-404A (R125/Rl34a/R143a:44/4/52), R-407B (R32/R125/R134a:10/70/20), R407C (R32/R125/R 134a:23/25/52) and R408A (R22/R125/R143a:46/7/47) are presented in this paper. Experiments showed that for Reynolds numbers higher than 3.00 E06, R-408A appears to have greater heat transfer rates than the other blends under investigation. Furthermore, it is quite evident from this data that R-407C has the highest pressure drop among the refrigerants under investigation.