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Evaporateurs des pompes à chaleur : corrélations entre les pertes de charge et les échanges thermiques dans des conditions d'air givrant.

Heat-pump evaporators under frosting air pressure drops and heat-exchange correlations.

Auteurs : ARGAUD T., PANHELEUX P., CLODIC D.

Résumé

Heat pumps often work in frosty conditions with decreasing performances. This frosting is characterised by thin frost layers mainly on the leading edge of fins. The narrow spacing of fins causes the clogging-up of the coil. It is the main effect, the frost layer thermal resistance being negligible. Yet, most studies focus on the frost growth, density and conductivity for large deposits on flat plates. The goal of the study is to determine the pressure drops and the heat transfer parameters for different coils under frosting conditions. The main geometric parameters are pitch, type and surface treatment of fins. Three finned-tube heat exchangers have been studied under frosty conditions in an experimental set-up.

Détails

  • Titre original : Heat-pump evaporators under frosting air pressure drops and heat-exchange correlations.
  • Identifiant de la fiche : 2001-1293
  • Langues : Anglais
  • Source : Proceedings of the 2000 International Refrigeration Conference at Purdue.
  • Date d'édition : 25/07/2000
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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