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Effet de la géométrie des ailettes sur le transfert de chaleur lors de la condensation du frigorigène R134 sur des tubes ailetés à surface augmentée.

[In Japanese. / En japonais.]

Auteurs : TAKAHASHI H., SAEKI C., KOYAMA S.

Type d'article : Article

Résumé

The paper presents the experimental results on the outside condensation heat transfer coefficient of horizontal enhanced finned tubes. Three different fin geometry types of three-dimensional enhanced finned tubes were tested. A low-fin-tube (LFT) 19 fin-per-inch (fpi) was also tested for reference. Experimental refrigerant used was R134a. The heat transfer coefficient test was carried out a condensing temperature of 40°C, at a cooling water velocity of 1.5 m/s, and the heat flux of 10 to 110 kW/m2.K. The outside condensation heat transfer coefficient of all three dimensional enhanced finned tubes were approximately 1.9 times higher than that of LFT 19 fpi at high heat flux range. In low heat flux range, the enhanced finned tube of small circumferential segmentation pitches at the fin tip was shown the highest outside heat transfer coefficient for all tubes tested.

Détails

  • Titre original : [In Japanese. / En japonais.]
  • Identifiant de la fiche : 2006-2264
  • Langues : Japonais
  • Source : Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 23 - n. 1
  • Date d'édition : 2006

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