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Coefficients de transfert de chaleur lors de la condensation des mélanges de HFC binaires en écoulement sur des ailettes basses ou des tubes de type "Turbo-C".

Condensation heat transfer coefficients of binary HFC mixtures on low fin and Turbo-C tubes.

Auteurs : JUNG D., CHAE S., BAE D., et al.

Type d'article : Article, Article de la RIF

Résumé

In this study, external condensation heat transfer coefficients (HTCs) were measured for nonazeotropic refrigerant mixtures (NARMs) of HFC-32/HFC-134a and HFC-134a/HCFC-123 on a low fin and Turbo-C tubes. All measurements are taken at the vapour temperature of 39 °C with the wall subcooling of 3-8 °C. Test results showed that condensation HTCs of NARMs on enhanced tubes were severely degraded from the ideal values showing up to 96% decrease. HTCs of the mixtures on Turbo-C tube were degraded more than those on low fin tube such that HTCs of the mixtures at the same composition were similar regardless of the tube. The mixture with larger gliding temperature differences (GTDs), HFC-134a/HCFC-123, showed a larger heat transfer reduction from the ideal values than the mixture with smaller GTDs, HF-C32/HFC-134a. Heat transfer enhancement ratios of the enhanced tubes with NARMs were almost 2 times lower than those with pure refrigerants and they decreased more as the GTDs of the mixtures increased.

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Format PDF

Pages : 212-217

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Détails

  • Titre original : Condensation heat transfer coefficients of binary HFC mixtures on low fin and Turbo-C tubes.
  • Identifiant de la fiche : 2005-1723
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 2
  • Date d'édition : 03/2005

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