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Transfert de chaleur par condensation et chute de pression d'un mélange azéotropique R32/R1270 à l'intérieur de tubes horizontaux de faible diamètre.

Condensation heat transfer and pressure drop of azeotropic mixture refrigerant R32/R1270 inside horizontal small-diameter tubes.

Numéro : pap. n. 702

Auteurs : HIROSE M., ICHINOSE J., JIGE D., et al.

Résumé

This paper describes an experimental study on condensation heat transfer and pressure drop using the small-diameter tube and refrigerants R410A and R32, along with the azeotropic mixture R32/R1270 (70 mass% R32; 30 mass% R1270 (propylene)), which was used as a test refrigerant existing at the azeotropic point. The experimental apparatus was a vapor compression heat pump system. Smooth and internally helically grooved small-diameter tubes were used as test tubes. The test heat exchanger consisted of four double-tube test sections with countercurrent flow. In each test section, a test tube in an annulus was cooled by cooling water, and the refrigerant flowed within an inner tube. The condensation temperature was maintained at 35°C, and the refrigerant mass flux ranged from 320 to 750 kg/(m2s). The experimental values for condensation heat transfer and pressure drop were compared with values obtained for R32 and R410A refrigerants and with the results of previous studies.

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Pages : 8 p.

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Détails

  • Titre original : Condensation heat transfer and pressure drop of azeotropic mixture refrigerant R32/R1270 inside horizontal small-diameter tubes.
  • Identifiant de la fiche : 30015553
  • Langues : Anglais
  • Source : Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
  • Date d'édition : 16/08/2015
  • DOI : http://dx.doi.org/10.18462/iir.icr.2015.0702

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