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Condensation heat transfer and pressure drop of low GWP R-404A alternative refrigerants (R-448A, R-449A, R-455A, R-454C) in a 5.6 mm inner diameter horizontal smooth tube.

Transfert de chaleur par condensation et chute de pression des frigorigènes de substitution au R-404A à faible PRP (R-448A, R-449A, R-455A, R-454C) dans un tube horizontal lisse de 5,6 mm de diamètre intèrieur.

Auteurs : LEE B. M., GOOK H. H., LEE Y. W., PARK D. H., KIM N. H.

Type d'article : Article de la RIF

Résumé

The literature survey reveals that condensation or evaporation study of R-404A alternative refrigerants are lacking. In this study, four R-404A alternative refrigerants - two short term refrigerants (GWP1002500: R-448A, R-449A) and two long term refrigerants (GWP100150: R-455A, R-454C) - including R-404A (GWP100 = 3922) were tested under condensation condition. Test range included mass flux from 80 to 400 kg m−2s−1, vapour quality from 0.2 to 0.8. Test tube had 5.6 mm inne diameter. Results showed that, at a low mass flux, heat transfer coefficients of the alternative refrigerants were approximately the same as those of R-404A. On the other hand, at a high mass flux of 400 kg m−2s−1, heat transfer coefficients of the alternative refrigerants were higher than those of R-404A. The reason was attributed to the balance of superior thermal properties, which were beneficial, and larger temperature glide, which were malign, of the alternative refrigerants compared with those of R-404A. Pressure drops of alternative refrigerants were larger than those of R-404A. Furthermore, long term refrigerants (R-454C, R-455A) yielded larger pressure drops than short term refrigerants (R-448A, R-449A), probably due to the influence of vapour density. Furthermore, data are compared with predictions by existing correlations.

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Format PDF

Pages : 71-82

Disponible

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    20 €

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Détails

  • Titre original : Condensation heat transfer and pressure drop of low GWP R-404A alternative refrigerants (R-448A, R-449A, R-455A, R-454C) in a 5.6 mm inner diameter horizontal smooth tube.
  • Identifiant de la fiche : 30028518
  • Langues : Anglais
  • Sujet : Alternatives aux HFC
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 128
  • Date d'édition : 08/2021
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2020.12.025
  • Disponible à la bibliothèque de l'IIF

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