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Document IIF

L'impact du givrage, du dégivrage et la formation de givre de nouveau sur la performance thermique et hydraulique côté air des échangeurs de chaleur à ailettes persiennes à tubes plats.

Frost, defrost, and refrost and its impact on the air-side thermal-hydraulic performance of louvered-fin, flat-tube heat exchangers.

Auteurs : XIA Y., ZHONG Y., HRNJAK P. S., et al.

Type d'article : Article, Article de la RIF

Résumé

The thermal-hydraulic performance under conditions of an initial frost growth on the air-side surface, and for subsequent 'refrosting' after a defrost period is experimentally studied for folded-louvered-fin, microchannel heat exchangers. In total, five heat exchangers are considered; the thermal performances during one frost-growth cycle for four different fin geometries are compared in terms of overall heat transfer coefficient, pressure drop, and j and f factors; the defrost and refrost characteristics of two heat exchangers are compared to explore geometry effects. Typically, the performance under refrosting conditions becomes periodic and repeatable after the third or fourth refrosting cycle. The allowable frost growth period (before a defrost is required), the defrost requirement, and the thermal-hydraulic performance depend on heat exchanger geometry for the specimens used in this study.

Documents disponibles

Format PDF

Pages : 1066-1079

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 : Frost, defrost, and refrost and its impact on the air-side thermal-hydraulic performance of louvered-fin, flat-tube heat exchangers.
  • Identifiant de la fiche : 2006-2283
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 29 - n. 7
  • Date d'édition : 11/2006

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