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R22, R407C et R410A : coefficients de transfert de chaleur sur des tubes horizontaux lisses, à ailettes basses, et de type "Turbo-C".

Condensation heat transfer coefficients of R22, R407C, and R410A on a horizontal plain, low fin, and turbo-C tubes.

Auteurs : JUNG D., KIM C. B., HWANG S. M., et al.

Type d'article : Article, Article de la RIF

Résumé

In this study, condensation heat transfer coefficients (HTCs) were measured on a horizontal plain tube, low fin tube, and Turbo-C tube at the saturated vapour temperature of 39 °C for R22, R407C, and R410A with the wall subcooling of 3-8 °C. R407C, a non-azeotropic refrigerant mixture, exhibited a quite different condensation phenomenon from those of R22 and R410A and its condensation HTCs were up to 50% lower than those of R22. For R407C, as the wall subcooling increased, condensation HTCs decreased on a plain tube while they increased on both low fin and turbo-C tubes. This was due to the lessening effect of the vapour diffusion film with a rapid increase in condensation rate on enhanced tubes. On the other hand, condensation HTCs of R410A, almost an azeotrope, were similar to those of R22. For all refrigerants tested, condensation HTCs of turbo-C tube were the highest among the tubes tested showing a 3-8 times increase as compared to those of a plain tube.

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Format PDF

Pages : 485-491

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    20 €

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Détails

  • Titre original : Condensation heat transfer coefficients of R22, R407C, and R410A on a horizontal plain, low fin, and turbo-C tubes.
  • Identifiant de la fiche : 2003-1718
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 26 - n. 4
  • Date d'édition : 06/2003

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