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Ebullition en écoulement de R-22, de R-134a et de CO2 dans un évaporateur horizontal à microcanaux. 2. Transfert de chaleur lors de l'ébullition en écoulement diphasique.

Flow boiling of R-22, R-134a and CO2 in horizontal evaporator with minichannels. 2. Two-phase flow boiling heat transfer.

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

Résumé

Convective boiling heat transfer experiments were performed in horizontal minichannels with R-22, R-134a and CO2. The test section is made of stainless steel tubes with inner diameters of 1.5 and 3.0 mm and with length of 2 m. It is uniformly heated by applying electric current directly to the tubes. Local heat transfer coefficients were obtained for heat flux ranges from 10 to 40 kW/m2, mass flux ranges from 200 to 600 kg/m2.s, quality ranges of up to 0.9, and the inlet temperature of 10°C. Laminar flow appears in the flow with minichannels. The experimental results were compared against six existing two-phase heat transfer coefficient correlations. A new boiling heat transfer coefficient correlation based on the superposition model for refrigerants has been developed with 11.74% mean deviation and -2.38% average deviation. See also the Bulletin of the IIR, reference 2007-0524.

Détails

  • Titre original : Flow boiling of R-22, R-134a and CO2 in horizontal evaporator with minichannels. 2. Two-phase flow boiling heat transfer.
  • Identifiant de la fiche : 2007-1030
  • Langues : Anglais
  • Source : ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Date d'édition : 21/05/2006

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