Partager

Document IIF

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

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

Numéro : pap. n. 643

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

Résumé

This study experimentally investigated the boiling heat transfer and pressure drop characteristics of R245fa/R1234ze(E) zeotropic refrigerant mixtures inside horizontal microfin tubes. The test tubes were copper tubes with an outer 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 fin numbers of 65 and 85, respectively. The experiments were conducted under mass velocities of 100 and 200 kgm–2s–1, mass fractions of 90/10, 80/20, and 65/35 mass% (R245fa/R1234ze(E)), and an average saturation temperature of 40 °C. The measured boiling heat transfer coefficient and frictional pressure drop of the R245fa/R1234ze(E) refrigerant mixture were lower than those of the pure refrigerant R245fa. During the boiling process, the heat transfer coefficient was minimized at a R245fa/R1234ze(E) composition of 65/35 mass%, which had the largest temperature glide. Furthermore, the frictional pressure drops decreased with the mass fraction of R1234ze(E).

Documents disponibles

Format PDF

Pages : 8

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 : Experiments on boiling heat transfer and pressure drop of refrigerant mixtures R245fa/R1234ze(E) inside horizontal microfin tubes.
  • Identifiant de la fiche : 30026014
  • 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.2019.0643

Liens


Voir d'autres communications du même compte rendu (632)
Voir le compte rendu de la conférence

Indexation