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Amélioration du transfert de chaleur côté air à l'aide d'un évaporateur utilisant un système de génération de vortex.

Air-side heat transfer enhancement of a refrigerator evaporator using vortex generation.

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

Type d'article : Article, Article de la RIF

Résumé

In most domestic and commercial refrigeration systems, frost forms on the air-side surface of the air-to-refrigerant heat exchanger. Frost-tolerant designs typically employ a large fin spacing in order to delay the need for a defrost cycle. Unfortunately, this approach does not allow for a very high air-side heat transfer coefficient, and the performance of these heat exchangers is often air-side limited. Longitudinal vortex generation is a proven and effective technique for thinning the thermal boundary layer and enhancing heat transfer, but its efficacy in a frosting environment is essentially unknown. In this study, an array of delta-wing vortex generators is applied to a plain-fin-and-tube heat exchanger with a fin spacing of 8.5 mm. Heat transfer and pressure drop performance are measured to determine the effectiveness of the vortex generator under frosting conditions. For air-side Reynolds numbers between 500 and 1300, the air-side thermal resistance is reduced by 35-42% when vortex generation is used. Correspondingly, the heat transfer coefficient is observed to range from 33 to 53 W/m2.K for the enhanced heat exchanger and from 18 to 26 W/m2.K for the baseline heat exchanger.

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Format PDF

Pages : 1006-1017

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    20 €

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    Gratuit

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Détails

  • Titre original : Air-side heat transfer enhancement of a refrigerator evaporator using vortex generation.
  • Identifiant de la fiche : 2005-2596
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 28 - n. 7
  • Date d'édition : 11/2005

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