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Document IIF

L'instabilité de l'écoulement du frigorigène comme moyen de prévision des moments où le dégivrage s'avère nécessaire : application à un congélateur utilisé pour la vente au détail.

Refrigerant flow instability as a means to predict the need for defrosting the evaporator in a retail display freezer cabinet.

Auteurs : LAWRENCE J. M. W., EVANS J. A.

Type d'article : Article, Article de la RIF

Résumé

For refrigerated display cabinets to perform their function of keeping food cold, there must be free movement of air through the evaporator. The moisture in the ambient air entrained in the cabinet forms frost on the evaporator. It is traditional for heat to be applied to the evaporator at regular intervals to melt this frost. The frequency, typically 3-4 times per day, is enough to avoid the frost becoming excessive even in extreme conditions. For much of the time defrosting is not always necessary. A large portion of the energy used during a defrost is an overhead - heating and then cooling the metal and the food rather than melting the frost. The effect of this is examined in the paper along with the results from testing an algorithm that detects the need for a defrost from the pattern of refrigerant flow (or evaporator exit superheat). The algorithm allows the number of defrosts to be reduced without excessively raising the temperature of food stored in the cabinet. The reduction in energy and carbon dioxide emission were examined and were shown to be substantial.

Documents disponibles

Format PDF

Pages : 107-112

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 : Refrigerant flow instability as a means to predict the need for defrosting the evaporator in a retail display freezer cabinet.
  • Identifiant de la fiche : 2008-0674
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 1
  • Date d'édition : 01/2008

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