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Document IIF

Condensation de R513A dans un tube à micro-ailettes de faible diamètre.

R513A condensation inside a small sized microfin tube.

Numéro : pap. n. 225

Auteurs : DIANI A., ROSSETTO L.

Résumé

R513A is a new azeotropic mixture made of R1234yf/R134a (56%/44%). Unlike pure R1234yf, R513A is non-flammable, and it can be used as replacement of R134a for medium and high temperature refrigeration systems. The paper shows some preliminary experimental results during R513A condensation inside a 4.0 mm OD horizontal microfin tube. The microfin tube has an inner diameter at the fin tip of 3.4 mm, it has 40 fins along the inner circumference, and each fin is 0.12 mm high with an apex angle of 43°. Tests are carried out for mass fluxes from 100 to 800 kg m-2 s-1, at saturation temperatures of 30 °C and 40 °C. The experimental results are given in terms of heat transfer coefficient and frictional pressure drop. The results show the interesting thermal characteristics of R513A, which can be used in a near future as replacement of the traditional R134a.

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Pages : 8

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Détails

  • Titre original : R513A condensation inside a small sized microfin tube.
  • Identifiant de la fiche : 30026369
  • 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.2019.0225

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