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Effect of fin geometry on condensation of zeotropic refrigerant mixture R407C in a staggered bundle of horizontal finned tubes.

[In Japanese. / En japonais.]

Author(s) : HONDA H., TAKATA N., TAKAMATSU H., et al.

Type of article: Article

Summary

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.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2001-2673
  • Languages: Japanese
  • Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 17 - n. 4
  • Publication date: 2000
  • Document available for consultation in the library of the IIR headquarters only.

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