The condensation heat transfer performance outside horizontal enhanced tubes of near-azeotropic refrigerant R404A and zeotropic refrigerant R407C was investigated in this study. The experimental data were analyzed using Wilson graphical method. The results show that the coefficients of condensation heat transfer outside horizontal enhanced tubes of R404A and R407C increase with the increase of supercooling degree of tube wall

which is different from pure refrigerant. For near-azeotropic or zeotropic refrigerant

some components will encounter the gas film resistance caused by the condensation of other components. With the increase of supercooling degree of tube wall

the volatile components begin to condense and the gas film becomes thin

thus the coefficient of condensation heat transfer will increase. The coefficient of condensation heat transfer outside horizontal enhanced tubes of R407C is 70% lower than R404A

which is due to the fact that the temperature glide of R407C is larger than R404A

and the impact of gas film outside tubes is greater. The heat transfer coefficient of R407C is improved obviously at higer heat flux condition

which is suitable for practical application.