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Génération de vortex comme méthode pour améliorer le transfert de chaleur du côté air dans les applications frigorifiques.

Vortex generation as an air-side heat transfer enhancement method for refrigeration applications.

Auteurs : SOMMERS A. D., JACOBI A. M.

Résumé

Longitudinal vortex generation is a technique for enhancing heat transfer and can be accomplished by placing small flow manipulators on the fin surface of a heat exchanger. In the study, a single row of delta-wing vortex generators is applied to a refrigerator evaporator with a fin spacing of 8.5 mm both along the leading edge and at a location halfway along the flow length. Heat transfer and pressure drop performance are measured before and after to determine the effectiveness of the vortex generator under frosting conditions. Under lightly frosted conditions, reductions in air-side thermal resistance of 3.5 to 22.8% are achieved for face velocities of 0.45 to 1.1 m/s. This heat transfer enhancement monotonically increases with air velocity and results in a small pressure drop penalty that is incommensurate with the achieved enhancement. Maximum frost accumulation in the enhanced heat exchanger is also examined for a single row of leading edge delta wings. Under these conditions, a reduction in the air-side thermal resistance is observed that falls within the uncertainty of the experiment.

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Détails

  • Titre original : Vortex generation as an air-side heat transfer enhancement method for refrigeration applications.
  • Identifiant de la fiche : 2004-2751
  • Langues : Anglais
  • Source : 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Date d'édition : 17/08/2003

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