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Caractéristiques du transfert de chaleur lors de l'ébullition en écoulement de R22 et de R134a dans des tubes de 0,5, 1,5 et 3 mm.

Flow boiling heat transfer characteristics of R22 and R134a in 0.5, 1.5 and 3.0 mm tubes.

Auteurs : CHOI K. I., PAMITRAN A. S., OH J. T., et al.

Résumé

An experimental study of R22 and R134a two-phase vaporization in horizontal minichannel was reported. In order to obtain the local heat transfer coefficients, the test was run under a heat flux range of 10 to 40 kW/m2, mass flux range of 200 to 600 kg/m2.s, saturation temperature range of 5 to 10°C, and quality up to 1.0. The test section, which was made of stainless steel tube and heated uniformly by applying an electric current to the tube directly, has inner tube diameters of 0.5, 1.5 and 3.0 mm, and lengths of 0.33 and 2.0 m. The effects on heat transfer coefficient of mass flux, heat flux and inner tube diameter were presented. The experimental heat transfer coefficients were compared with the predictions using existing heat transfer coefficient correlations. A new boiling heat transfer coefficient correlation based on the superposition model, with considering the laminar flow, was developed.

Documents disponibles

Format PDF

Pages : pp. 81-87

Disponible

  • Prix public

    20 €

  • Prix membre*

    15 €

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : Flow boiling heat transfer characteristics of R22 and R134a in 0.5, 1.5 and 3.0 mm tubes.
  • Identifiant de la fiche : 2010-0740
  • Langues : Anglais
  • Source : ACRA-2009. The proceedings of the 4th Asian conference on refrigeration and air conditioning: May 20-22, 2009, Taipei, R.O.C.
  • Date d'édition : 20/05/2009

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