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Document IIF

Coefficients de transfert de chaleur lors de l'ébullition nucléée de frigorigènes purs halogénés.

Nucleate boiling heat transfer coefficients of pure halogenated refrigerants.

Auteurs : JUNG D., KO Y., AHN K.

Résumé

Nucleate pool boiling heat transfer coefficients of HCFC-123, CFC-11, HCFC-142b, HFC-134a, CFC-12, HCFC-22, HFC-125 and HFC-32 on a horizontal smooth tube of 19.0 mm outside diameter have been measured. A cartridge heater was used to generate uniform heat flux on the tube. Data were taken in the order of decreasing heat flux from 80 to 10 kW/m2 with an interval of 10 kW/m2 in the pool of 7 °C. It was found that nucleate boiling heat transfer correlations available in the literature were not good for certain alternative refrigerants such as HFC-32 and HCFC-142b. Hence, a new correlation was developed by a regression analysis taking into account the variation of the exponent to the heat flux term as a function of reduced pressure and some other properties. The new correlation showed a good agreement with all measured data including those of new refrigerants of significantly varying vapour pressures with a mean deviation of less than 7%.

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Détails

  • Titre original : Nucleate boiling heat transfer coefficients of pure halogenated refrigerants.
  • Identifiant de la fiche : 2004-2167
  • Langues : Anglais
  • Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Date d'édition : 17/08/2003

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