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Frigorigènes inflammables : coefficients de transfert de chaleur lors de la condensation.

Condensation heat transfer coefficients of flammable refrigerants.

Auteurs : JUNG D., CHAE S., BAE D., et al.

Type d'article : Article, Article de la RIF

Résumé

In this study, external condensation heat transfer coefficients (HTCs) of six flammable refrigerants of propylene (R1270), propane (R290), isobutane (R600a), butane (R600), dimethylether (RE170), and HFC32 were measured at the vapor temperature of 39 °C on a plain tube of 19.0 mm outside diameter with a wall subcooling. Test results showed a typical trend that external condensation HTCs decrease with the wall subcooling. No unusual behavior or phenomenon was observed for these flammable refrigerants during experiments. HFC32 and DME showed 28-44% higher HTCs than those of HCFC22 due to their excellent thermophysical properties. Propylene and butane showed the similar HTCs as those of HCFC22 while propane and isobutane showed 9% lower HTCs than those of HCFC22. Finally, a general correlation was made by modifying Nusselt's equation based upon the measured data of eleven fluids of various vapour pressures including halogenated refrigerants. The general equation showed an excellent agreement with all data exhibiting a deviation of less than 3%.

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Format PDF

Pages : 314-317

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Détails

  • Titre original : Condensation heat transfer coefficients of flammable refrigerants.
  • Identifiant de la fiche : 2004-1021
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 3
  • Date d'édition : 05/2004

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