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Impact de la géométrie des ailettes sur la condensation d'un mélange zéotrope de R407C dans un faisceau de tubes horizontaux ailetés en quinconce.

[In Japanese. / En japonais.]

Auteurs : HONDA H., TAKATA N., TAKAMATSU H., et al.

Type d'article : Article

Résumé

Row-by-row heat transfer data were obtained during condensation of downward-flowing refrigerant mixture R407C in a staggered bundle of horizontal finned tubes. Two kinds of conventional low-fin tubes with flat-sided annular fins and three kinds of three-dimensional fin tubes were tested. The refrigerant mass velocity ranged from 4 to 23 kg/m2s, and the condensation temperature difference from 1.5 to 12 K. At a low to medium film Reynolds number (less than 2000), the highest heat transfer coefficient was obtained by one of the three-dimensional fin tubes. At a high film Reynolds number (higher than 2000), on the other hand, the highest performance was obtained by one of the low-fin tubes. For all tubes tested, the heat transfer coefficient decreased with decreasing mass velocity. On the basis of previous results for R134a, consideration was given to the characteristics of vapour phase mass transfer of R407C.

Détails

  • Titre original : [In Japanese. / En japonais.]
  • Identifiant de la fiche : 2001-2673
  • Langues : Japonais
  • Source : Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 17 - n. 4
  • Date d'édition : 2000
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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