Heat transfer prediction of air-to-refrigerant two-phase flow boiling of alternatives to HCFC-22 inside air/refrigerant enhanced surface tubing

✍ Scribed by Samuel M. Sami; Julien Grell

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 178 KB
• Volume: 24
• Category: Article
• ISSN: 0363-907X
• DOI: 10.1002/(sici)1099-114x(20000325)24:4<349::aid-er590>3.0.co;2-t

✦ Synopsis

In this paper, an experimental study on the heat transfer characteristics of two-phase #ow boiling of some alternative refrigerants to HCFC-22, on air/refrigerant horizontal enhanced surface tubing, is presented. Correlations have been proposed to predict the heat transfer characteristics such as average heat transfer coe$cients, as well as pressure drops of alternatives to R-22; such as R-507, R-404A, R-407C, R-410A and R-408A in two-phase #ow boiling inside enhanced surface tubing. In addition, it was found that the refrigerant mixture's pressure drop is a weak function of the mixture's composition. It was found that the correlations were applicable to the entire heat and mass #ux, investigated in the present study, for the proposed blends under question. The deviation between the experimental and predicted values for the heat transfer coe$cient and pressure drop were less than $20, and $35 per cent, respectively, for the majority of data.