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Caractéristiques de transfert de chaleur d'un thermosiphon diphasique à boucle fermée.

Heat transfer characteristics of a two-phase closed thermosiphon.

Auteurs : NOIE S. H.

Type d'article : Article

Résumé

The applications of closed two-phase thermosiphons are increasing in heat recovery systems in many industrial practices because of their high effectiveness. Various parameters affect the heat transfer performance of thermosiphons. In this paper, the effect of three parameters: input heat transfer rates, the working fluid filling ratios, and the evaporator lengths (aspect ratios) were investigated experimentally. The aspect ratios for these experiments were 7.45, 9.8, and 11.8. A series of experiments were carried out to find the influence of the above parameters on steady-state heat transfer characteristics of a vertical two-phase closed thermosiphon. The temperature distribution along the thermosiphon was monitored; input heat to evaporator section and output heat from condenser were measured, as well. The experimental boiling heat transfer coefficients were compared with existing correlations. Conclusions have been drawn for the optimum-filling ratio at which the thermosiphon operates at its best for a certain aspect ratio.

Détails

  • Titre original : Heat transfer characteristics of a two-phase closed thermosiphon.
  • Identifiant de la fiche : 2005-2502
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 25 - n. 4
  • Date d'édition : 03/2005

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