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HFC-134a : corrélation expérimentale de la condensation d'un film tombant sur des tubes à surface augmentée.

Experimental correlation of falling film condensation on enhanced tubes with HFC-134a: low-fin and Turbo-C tubes.

Auteurs : KANG Y. T., HONG H., LEE Y. S.

Type d'article : Article, Article de la RIF

Résumé

The objectives of this paper are to develop experimental correlations of heat transfer for enhanced tubes used in a falling film condenser, and to provide a guideline for optimum design of the falling film condenser with a high condensing temperature of 59.8°C. Tests are performed for four different enhanced tubes; a low-fin and three Turbo-C tubes. The working fluid is HFC-134a, and the system pressure is 16.0 bars. The results show that the heat transfer enhancement of low-fin tube, Turbo-C (1), Turbo-C (2) and Turbo-C (3) ranges 2.8-3.4, 3.5-3.8, 3.8-4.0 and 3.6-3.9 times, respectively, compared with the theoretical Nusselt correlation. It was found that the condensation heat transfer coefficient decreased with increasing the falling film Reynolds number and the wall subcooling temperature. It was also found that the enhanced tubes became more effective in the high wall subcooling temperature region than in the low wall subcooling temperature region. This study developed an experimental correlation of the falling film condensation with an error band of plus or minus 5%.

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Pages : 805-811

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Détails

  • Titre original : Experimental correlation of falling film condensation on enhanced tubes with HFC-134a: low-fin and Turbo-C tubes.
  • Identifiant de la fiche : 2007-1452
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 30 - n. 5
  • Date d'édition : 08/2007

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