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Simulation numérique et validation expérimentale de l'influence d'un échangeur de chaleur interne sur les cycles transcritiques au CO2 sous des conditions de fonctionnement réelles des petits systèmes frigorifiques.

Numerical simulation and experimental validation of internal heat exchanger influence in CO2 transcritical cycles under real working conditions for small cooling applications.

Auteurs : RIGOLA J., ABLANQUE N., PÉREZ-SEGARRA C. D., et al.

Résumé

The aim of this paper is to show the possibilities that CO2 offers for commercial refrigeration, considering a single stage transcritical cycle using semihermetic reciprocating compressors under small cooling capacity systems. This paper is a numerical and experimental comparative study of the whole refrigerating cycle in general, and reciprocating compressors in particular, considering a refrigerating system working with CO2 under a transcritical refrigerating cycle. The present paper is focussed on the influence of using internal heat exchanger (IHE) in order to improve the cycle performance under real working conditions. In order to validate the numerical results, a specific experimental unit specially designed and built to analyze transcritical refrigerating equipments considering IHE has been built. Both numerical results and experimental data shows reasonable good agreement, while the comparative global values shows the improvement of cooling capacity and COP when IHE is considered in the CO2 transcritical cycle under the same working conditions.

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Pages : 2008-2

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Détails

  • Titre original : Numerical simulation and experimental validation of internal heat exchanger influence in CO2 transcritical cycles under real working conditions for small cooling applications.
  • Identifiant de la fiche : 2010-1373
  • Langues : Anglais
  • Source : 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
  • Date d'édition : 07/09/2008

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