| Title |
Condensation Heat Transfer Coefficients of Binary Refrigerant Mixtures on a Horizontal Smooth Tube |
| Keywords |
Condensation heat transfer ; 응축열전달 ; Binary refrigerant mixture ; 이원 혼합냉매 ; Non-azeotropic mixture ; 비공비 혼합냉매 ; Pure refrigerant ; HFC32 ; HFC134a ; HCFC123 |
| Abstract |
In this study, condensation heat transfer coefficients (HTCs) of 2 nonazeotropic refrigerant mixtures of HFC32/HFC134a and HFC134a/HCFC123 at various compositions were measured on a horizontal smooth tube. All data were taken at the vapor temperature of 39℃ with a wall subcooling of 3∼8 K. Test results showed that HTCs of tested mixtures were 11.0∼85.0% lower than the ideal values calculated by the mass fraction weighting of the pure component HTCs. Thermal resistance due to the diffusion vapor film was partly responsible for the significant reduction of HTCs with these nonazeotropic mixtures. The measured data were compared against the predicted ones by Colburn and Drew's film model and a good agreement was observed. |