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Expériences sur le transfert de chaleur par condensation et sur la chute de pression de mélanges de frigorigènes R245fa/R1234ze(E) dans des tubes horizontaux à micro-ailettes.

Experiments on condensation heat transfer and pressure drop of refrigerant mixtures R245fa/R1234ze(E) inside horizontal microfin tubes.

Numéro : pap. n. 660

Auteurs : WATANABE K., LIU Y., JIGE D., et al.

Résumé

This study experimentally investigated the condensation heat transfer and pressure drop characteristics of zeotropic refrigerant mixtures R245fa/R1234ze(E) inside horizontal microfin tubes. The test was conducted using copper tubes with an outside diameter of 9.52 mm, equivalent inner diameters of 8.9 and 8.7 mm, fin heights of 0.12 and 0.18 mm, and 65 and 85 fins. The experiments were conducted under mass velocities of 100 and 200 kg.m-2.s-1, mass fractions of 90/10, 80/20, and 65/35 mass%, and an average saturation temperature of 60 °C. The measured condensation heat transfer coefficient and frictional pressure drop of the refrigerant mixture R245fa/R1234ze(E) were lower than that of pure refrigerant R245fa. The condensation heat transfer coefficient was minimized with the 65/35 mass% composition R245fa/R1234ze(E) with the largest temperature glide. Furthermore, the frictional pressure drop decreased with an increase in the mass fraction of R1234ze(E).

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Pages : 8

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Détails

  • Titre original : Experiments on condensation heat transfer and pressure drop of refrigerant mixtures R245fa/R1234ze(E) inside horizontal microfin tubes.
  • Identifiant de la fiche : 30026016
  • Langues : Anglais
  • Source : Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Date d'édition : 24/08/2019
  • DOI : http://dx.doi.org/10.18462/iir.icr.2019.0660

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