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Transfert de chaleur par condensation de R513A et de R516A dans un canal de faible diamètre : coefficient de transfert de chaleur et configuration de l’écoulement.

Condensation heat transfer of R513A and R516A in a small diameter channel: heat transfer coefficient and flow pattern.

Numéro : 0576

Auteurs : MATTIUZZO N., AZZOLIN M., BERTO A., BORTOLIN S., DEL COL D.

Résumé

In the present work, condensation tests are performed with the binary mixture R513A (R1234yf/R134a at 56.0/44.0% by mass composition) and the ternary mixture R516A (R1234yf/R152a/R134a at 77.5/14/8.5% by mass composition) inside a channel with inner diameter equal to 3.38 mm. Both the mixtures are azeotropic and can be considered as drop-in refrigerants for R134a: R513A has a GWP100-years equal to 573 and is classified as A1 by ANSI/ASHRAE Standard 34 whereas R516A has a GWP100-years equal to 131 and is classified as A2L. Heat transfer coefficients are measured at 40 °C saturation temperature and mass flux from 50 kg m-2 s-1 to 300 kg m-2 s-1. The heat transfer test section consists of two heat exchangers for heat transfer measurements and a glass tube for flow pattern visualizations. The flow patterns are recorded by a highspeed camera. Experimental data are compared against R134a data measured in the same test section. The prediction accuracy of condensation heat transfer models is assessed against the experimental results.

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Format PDF

Pages : 10 p.

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    20 €

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Détails

  • Titre original : Condensation heat transfer of R513A and R516A in a small diameter channel: heat transfer coefficient and flow pattern.
  • Identifiant de la fiche : 30031633
  • Langues : Anglais
  • Sujet : Alternatives aux HFC
  • Source : Proceedings of the 26th IIR International Congress of Refrigeration: Paris , France, August 21-25, 2023.
  • Date d'édition : 21/08/2023
  • DOI : http://dx.doi.org/10.18462/iir.icr.2023.0576

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