Prediction of condensation characteristics of alternatives to R-502 inside air–refrigerant enhanced surface tubing

✍ Scribed by Samuel M Sami; M Fontaine

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 207 KB
• Volume: 20
• Category: Article
• ISSN: 1359-4311
• DOI: 10.1016/s1359-4311(99)00012-5

✦ Synopsis

In this paper, an experimental study on the heat transfer characteristics of two-phase ¯ow condensation of alternative azeotropic refrigerant mixtures to R-502, on air/refrigerant horizontal enhanced surface tubing, is presented. The condensation data indicated that the heat transfer coecient on the blend R-408A has the highest heat transfer rate among the blends under investigation. The condensation data also showed that R-502 and R-407B have similar heat transfer rates when plotted against the refrigerant mass ¯ow rate. It also can be observed that, as the mass ¯ux increases, heat transfer coecient increases. Correlations were proposed to predict the heat transfer characteristics such as average heat transfer coecients, as well as pressure drops of alternatives to R-502; such as R507, R404A, R407B and R408A in two-phase ¯ow condensation inside enhanced surface tubing. In addition, proposed correlations were found to fairly predict the two-phase ¯ow heat transfer condensation data.