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Détermination de [la période] de démarrage du dégivrage dans un système de pompe à chaleur air-air par la méthode de calcul du volume de givre.

Determination of defrosting start time in an air-to-air heat pump system by frost volume calculation method.

Auteurs : YOO J. W., CHUNG Y., KIM G. T., et al.

Type d'article : Article, Article de la RIF

Résumé

Naturally, frost forms at fin-tube evaporator surface when refrigerant below 0°C flows inside the heat exchanger. Frost tends to block the evaporator, hinders efficient heat exchange and degrades the performance of the system. The determination of the start time for defrosting is one of the essential issues that most of air heat pumps are confronted with because it is directly connected to energy consumption. Many types of sensors can be installed for frost detection but they are usually not cost-effective or related logic is not so physically presented. In this study, a novel frost volume calculation method is suggested in order to determine the start time for defrosting in an air-to-air heat pump system. The detailed explanation of the method is presented and verified with experimental data. With this method, the start timing of defrosting can be appropriately judged. At the time of defrosting, the heating capacity decreased from 16.2 to 39.3% and the COP reduced from 12.3 to 26.4% compared with maximum values. The blocking ratio from image processing at the time was between 0.83 and 0.97.

Documents disponibles

Format PDF

Pages : 169-178

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 : Determination of defrosting start time in an air-to-air heat pump system by frost volume calculation method.
  • Identifiant de la fiche : 30025239
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 96
  • Date d'édition : 12/2018
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2018.08.014

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