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Document IIF

Une étude sur les effets de la forme en col des ailettes sur la performance du transfert de chaleur des échangeurs à tubes ailetés.

A study on the effects of fin collar shape on the heat transfer performance of fin-tube heat exchangers.

Auteurs : TSUBAKI K., MIYARA A., NAGAI Y., et al.

Résumé

A numerical study is conducted to investigate effects of a triangular space in fin-tube heat exchangers on heat transfer performance. The triangular shape is formed by two adjacent fin collars and a copper tube where the fin collar does not contact the copper tube. It affects on not only thermal resistance between a copper tube and fin collars but also air side heat convection. Size of the triangular space depends on its production process and is not constant. In the numerical simulation, the triangular shape was assumed as an equilateral triangle. The ratio of the triangle edge length to fin pitch is varied from 0 to 40%. A thermal conductance was set on contact surface of the tube and fin collar. Due to a decrease of the thermal conductance value, heat transfer rate also decreases. Size of the triangular space affects to both air side convection and total contact resistance between the tube and fin collar. Increase of the triangular space increases non-contact area of the fin collars with tube and decreases heat transfer rate. On the other hand, the air side heat convection is encouraged. The triangular space changes the fin collar shape and air flow pattern around the tube. Heat transfer rate enhanced about 1% due to the increase of the triangular space.

Documents disponibles

Format PDF

Pages : ICR07-E1-1185

Disponible

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    20 €

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    Gratuit

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Détails

  • Titre original : A study on the effects of fin collar shape on the heat transfer performance of fin-tube heat exchangers.
  • Identifiant de la fiche : 2008-0554
  • Langues : Anglais
  • Source : ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Date d'édition : 21/08/2007

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