Document IIF

Mesurages et modélisation du transfert de chaleur lors de l'ébullition en écoulement de R455A et R452B à l'intérieur de canaux.

Measurements and modelling of R455A and R452B flow boiling heat transfer inside channels.

Auteurs : BERTO A., AZZOLIN M., BORTOLIN S., GUZZARDI C., DEL COL D.

Type d'article : Article de la RIF

Résumé

Heat transfer coefficients during flow boiling of non-azeotropic mixtures are measured inside two horizontal smooth tubes of 8.0 mm and 0.96 mm inner diameter. The experimental tests are performed with ternary mixtures R455A (R32/R1234yf/R744 at 21.5/75.5/3% by mass) and R452B (R32/R1234yf/R125 at 67/26/7% by mass), displaying respectively a temperature glide of about 11 K and 1 K in the present tests. The effects of vapour quality, saturation pressure, heat flux, mass velocity and channel diameter on the heat transfer coefficient of the mixtures are investigated. The experimental results are compared against selected flow boiling correlations. Because of the zeotropic characteristics of the mixtures, the models developed for pure fluids are modified following the Shah (2015) approach to account for the mass transfer resistance, affecting both the nucleate and the convective boiling mechanisms. Simple tools to estimate the mass transfer resistance in the prediction of the flow boiling heat transfer coefficients in the case of a high temperature-glide mixture are here presented and assessed.

Documents disponibles

Format PDF

Pages : 271-284

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 : Measurements and modelling of R455A and R452B flow boiling heat transfer inside channels.
  • Identifiant de la fiche : 30027874
  • Langues : Anglais
  • Sujet : Technologie, Alternatives aux HFC
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 120
  • Date d'édition : 12/2020
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2020.08.007
  • Disponible à la bibliothèque de l'IIF

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