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Coefficients de transfert de chaleur de condensation de tubes à surface augmentée fonctionnant avec des frigorigènes de remplacement de CFC-11 et de CFC-12.

Condensation heat transfer coefficients of enhanced tubes with alternative refrigerants for CFC-11 and CFC-12.

Auteurs : JUNG D., KIM C. B., CHO S., SONG K.

Type d'article : Article, Article de la RIF

Résumé

Condensation heat transfer coefficients (HTCs) of a plain tube, low fin tube, and Turbo-C tube were measured for the low pressure refrigerants CFC-11 and HCFC-123 and for the medium pressure refrigerants CFC-12 and HFC-134a. All data were taken at the vapor temperature of 39°C with a wall subcooling of 3-8°C. Test results showed that the HTCs of HFC-123, an alternative for CFC-11, were 8.2-19.2% lower than those of CFC-11 for all the tubes tested. On the other hand, the HTCs of HCFC-134a, an alternative for CFC-12, were 0.0-31.8% higher than those of CFC-12 for all the tubes tested. For all refrigerants tested, the Turbo-C tube showed the highest HTCs among the tubes tested showing almost an 8 times increase in HTCs as compared to the plain tube. Nusselt's prediction equation yielded a 12% deviation for the plain tube data while Beatty and Katz's prediction equation yielded a 20% deviation for the low fin tube data.

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Format PDF

Pages : 548-557

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    20 €

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Détails

  • Titre original : Condensation heat transfer coefficients of enhanced tubes with alternative refrigerants for CFC-11 and CFC-12.
  • Identifiant de la fiche : 2000-0042
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 22 - n. 7
  • Date d'édition : 11/1999

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