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Étude expérimentale du transfert de chaleur dans les mélanges R744/R600a en dessous de la température du point triple du R744.

Experimental study of the heat transfer in R744/R600a mixtures below the R744 triple point temperature.

Auteurs : SOBIERAJ M., ROSINSKI M.

Type d'article : Article, Article de la RIF

Résumé

Carbon dioxide, a natural refrigerant, is attracting attention as a direct solution to the legal restrictions on hydrofluorocarbon (HFC) refrigerants. The use of carbon dioxide as a refrigerant is limited by the triple point temperature of -56.5?°C. However, used along with a carrier fluid, carbon dioxide can provide refrigeration to temperatures lower than the triple point. A blend composed of carbon dioxide (R744) and isobutane (R600a) is experimentally studied. An experimental setup was designed, built, and verified in order to obtain the sublimation heat transfer coefficients of R744/R600a mixtures at temperatures lower than -56.5?°C. The test section comprises a horizontal copper tube with an inner diameter of 10?mm and length of 1?m. The tube is electrically heated by a copper wire heater wrapped uniformly around the tube. The tests were conducted with a novel refrigerant blend at heat fluxes from 3630?W m-2 to 8480?W m-2. The heat transfer coefficient decreases with increasing heat flux. Furthermore, a heat transfer coefficient calculation correlation has been developed.

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Format PDF

Pages : 243-252

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

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

Détails

  • Titre original : Experimental study of the heat transfer in R744/R600a mixtures below the R744 triple point temperature.
  • Identifiant de la fiche : 30026141
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 103
  • Date d'édition : 07/2019
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2019.03.038

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