Partager

Document IIF

Condensation, à l'intérieur de tubes, de R134a, R22, R407C et R410A avec des tubes à surface interne augmentée.

In-tube condensation of R134a, R22, R407C and R410A with highly internally enhanced tubes.

Auteurs : NESHAN M., THORS P., TZUOO S. M.

Résumé

To improve heat exchanger efficiency, a highly enhanced inside tube surface was developed. The effect of surface enhancement was evaluated by comparing two-phase in-tube heat transfer and pressure drop for condensation using R410A, R22, R134a, and R407C in 9.53 mm (3/8") tubes with two internal enhancements. The experiments were mainly performed on a highly internally enhanced tube, herringbone grooves with intermediate sets of fins positioned in the areas between the primary fins. Data for a conventional helical micro-fin tube were also taken as a baseline comparison of performance. The data obtained indicates that the highly internally enhanced tube yielded 30 to 80% higher heat transfer coefficient than the helical micro-fin tube for all tests. However, increased surfaced enhancement did not result in significant pressure drop penalty for the flow rates less than 136 kg/hr (i.e., 300 lb/h) in comparison with the micro-fin tube tested.

Documents disponibles

Format PDF

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 : In-tube condensation of R134a, R22, R407C and R410A with highly internally enhanced tubes.
  • Identifiant de la fiche : 2004-2713
  • Langues : Anglais
  • Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Date d'édition : 17/08/2003

Liens


Voir d'autres communications du même compte rendu (398)
Voir le compte rendu de la conférence

Indexation