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Condensation heat transfer of R22 and R410A in flat aluminum multi-channel tubes with or without micro-fins.

Author(s) : KIM N. H., CHO J. P., KIM J. O., et al.

Type of article: Article, IJR article

Summary

In this study, condensation heat transfer tests were conducted in flat aluminum multi-channel tubes using R410A, and the results were compared with those obtained using R22. The flat tubes have two internal geometries: one with smooth inner surface and the other with micro-fins. Data were presented for the following range of variables: vapour quality (0.1-0.9), mass flux (200-600 kg/m2s) and heat flux (5-15 kW/m2). Results showed that the effect of surface tension drainage on the fin surface is more pronounced for R22 than R410A. The smaller Weber number of R22 may be responsible for this effect. For the smooth tube, the heat transfer coefficient of R410A is slightly higher than that of R22. For the micro-fin tube, however, the trend is reversed. One possible reason is provided by considerations of the physical properties of the refrigerants. For the smooth tube, Webb's correlation predicts the data reasonably well. For the micro-fin tube, the Yang and Webb model was modified to correlate the present data. The modified model adequately predicts the data.

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Pages: 830-839

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Details

  • Original title: Condensation heat transfer of R22 and R410A in flat aluminum multi-channel tubes with or without micro-fins.
  • Record ID : 2004-1636
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 7
  • Publication date: 2003/11

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