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R22, R134a, R407C et R410A : coefficients de transfert de chaleur en condensation lors de l'écoulement à l'intérieur de tubes lisses et à microailettes.

Flow condensation heat transfer coefficients of R22, R134a, R407C, and R410A inside plain and microfin tubes.

Auteurs : JUNG D., CHO Y., PARK K.

Type d'article : Article, Article de la RIF

Résumé

Flow condensation heat transfer coefficients (HTCs) of R22, R134a, R407C, and R410A inside horizontal plain and microfin tubes of 9.52 mm outside diameter and 1 m length were measured at the condensation temperature of 40 °C with mass fluxes of 100, 200, and 300 kg m-2 s-1 and a heat flux of 7.7-7.9 kW m-2. For a plain tube, HTCs of R134a and R410A were similar to those of R22 while HTCs of R407C are 11-15% lower than those of R22. For a microfin tube, HTCs of R134a were similar to those of R22 while HTCs of R407C and R410A were 23-53% and 10-21% lower than those of R22. For a plain tube, our correlation agreed well with the present data for all refrigerants exhibiting a mean deviation of 11.6%. Finally, HTCs of a microfin tube were 2-3 times higher than those of a plain tube and the heat transfer enhancement factor decreased as the mass flux increased for all refrigerants tested.

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Format PDF

Pages : 25-32

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 : Flow condensation heat transfer coefficients of R22, R134a, R407C, and R410A inside plain and microfin tubes.
  • Identifiant de la fiche : 2004-0555
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 1
  • Date d'édition : 01/2004

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