Partager

Influence du condensat noyé sur le transfert de chaleur de R134a se condensant sur des tubes tridimensionnels à surface augmentée et des tubes à forte densité d'ailettes intégrales.

Influence of condensate inundation on heat transfer of R134a condensing on three dimensional enhanced tubes and integral-fin tubes with high fin density.

Auteurs : JI W. T., ZHAO C. Y., ZHANG D. C., et al.

Type d'article : Article

Résumé

High performance integrally-finned tubes with external fin density of 54 and 56 fpi are designed and manufactured. The condensing heat transfer of R134a on five tubes with integral-fin density of 20, 37, 48, 54, 56 fpi and five different high performance three dimensional enhanced tubes are studied for their single horizontal tube. Condensate inundation experiment of the integrally-finned and three-dimensional enhanced tubes is also performed. The experimental results indicate that the specially-designed integrally-finned tubes No.4 and No.5 of high density show the highest overall heat transfer performance over the three dimensional enhanced tubes about 8%. For the lower fin density integrally-finned tube, the results show apparently no condensate inundation influence effect. For the higher fin density tubes, the heat transfer is firstly enhanced more or less with the condensate impinging from the above tube, then maintains nearly unchanged. For the 3-D enhanced tubes, the heat transfer is also enhanced with condensate inundation firstly except tube No.7, while it is all followed by a mild drop as the increase of condensate rate. As a whole, the performance of the integral-fin tube with high density is better than that of the 3-D enhanced tubes. [Reprinted with permission from Elsevier. Copyright, 2012].

Détails

  • Titre original : Influence of condensate inundation on heat transfer of R134a condensing on three dimensional enhanced tubes and integral-fin tubes with high fin density.
  • Identifiant de la fiche : 30003813
  • Langues : Anglais
  • Source : Applied Thermal Engineering - vol. 38
  • Date d'édition : 05/2012
  • DOI : http://dx.doi.org/10.1016/j.applthermaleng.2012.01.029

Liens


Voir d'autres articles du même numéro (7)
Voir la source

Indexation