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Transfert de la chaleur lors de l'ébullition et de la condensation pour les nouveaux frigorigènes HFE245mc et HFE143m en écoulement à l'intérieur de tubes horizontaux.

Boiling and condensation heat transfer for new refrigerants HFE245mc and HFE143m flowing in horizontal tubes.

Auteurs : MORI H., YOSHIDA S., OHISHI K.

Type d'article : Article

Résumé

Hydrofluoroethers (HFEs) have recently been proposed as substitutes to conventional refrigerants including HFCs, since HFEs have zero ozone depletion potential and also smaller global warming potential. HFE245mc and HFE143m are such substitutes to replace CFC114 especially for heat recovery heat pump systems and HFC134a for refrigerating systems, respectively. In the present study, experiments were made on boiling and condensation heat transfer for HFE245mc and HFE143m flowing inside horizontal smooth tubes. For each new refrigerant, no particular difference compared with conventional refrigerants were found with respect to boiling and condensation heat transfer characteristics, as results of comparisons of measured local boiling and condensation heat transfer coefficients with respective correlations applicable to conventional refrigerants; the authors' correlation for boiling and the Haraguchi et al.'s correlation for condensation. Comparing the values calculated from the correlations, the heat transfer coefficient for HFE245mc was shown to be higher than or equal to that of CFC114 for boiling and condensation. Similarly, the heat transfer coefficient for HFE143m was shown to be almost equal to that of HFC134a for boiling and condensation. From the standpoint of heat transfer, therefore, the use of HFE245mc and HFE143m as the alternative refrigerants to CFC114 and HFC134a, respectively, did not constitute a problem.

Détails

  • Titre original : Boiling and condensation heat transfer for new refrigerants HFE245mc and HFE143m flowing in horizontal tubes.
  • Identifiant de la fiche : 2004-2125
  • Langues : Anglais
  • Source : Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 20 - n. 3
  • Date d'édition : 2003
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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