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Transfert de chaleur lors de la condensation de R22 et de R410A dans des tubes en aluminium à multiples canaux, avec ou sans microailettes.

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

Auteurs : KIM N. H., CHO J. P., KIM J. O., et al.

Type d'article : Article, Article de la RIF

Résumé

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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Format PDF

Pages : 830-839

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    20 €

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Détails

  • Titre original : Condensation heat transfer of R22 and R410A in flat aluminum multi-channel tubes with or without micro-fins.
  • Identifiant de la fiche : 2004-1636
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 7
  • Date d'édition : 11/2003

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