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Etude expérimentale d'un système en cascade NH3/CO2 et comparaison avec un système au R404A dans les systèmes de supermarchés.

Una "cascata" di NH3/CO2.

Auteurs : SAWALHA S., PERALES CABREJAS C., LIKITTHAMMANIT M., et al.

Type d'article : Article de périodique

Résumé

This article is the Italian translation of an article presented at the 22nd IIR international Congress in Beijing, China (see the Bulletin of the IIR, reference 2007-2661). This study investigates the performance of an NH3/CO2 cascade system for supermarket refrigeration application in a laboratory environment. The tested CO2 system is designed and scaled to fulfil the requirements of an average size supermarket in Sweden. Possibility for hot gas defrost in the freezers has been investigated and compared to the conventional electric heaters defrost method. Two cascade condenser arrangements have been evaluated. The cascade system has been compared to R404A system installed in the same laboratory. The results show that connecting the cascade condenser via thermosiphon or hot gas de-superheat arrangements yields good system stability and heat transfer performance. Hot gas defrost successfully defrosted the freezer evaporator but with long period and higher energy consumption compared to the conventional electric defrost method. The tested cascade system had up to 60% higher total COP compared to the R404A system installed in laboratory.

Détails

  • Titre original : Una "cascata" di NH3/CO2.
  • Identifiant de la fiche : 2009-1125
  • Langues : Italien
  • Source : Bull. IIF-IIR/Freddo - vol. 63 - n. 2
  • Date d'édition : 04/2009
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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