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Évaluation des performances thermodynamiques d’un système frigorifique en cascade avec des frigorigènes mixtes : R744 / R1270, R744 / R717 et R744 / RE170.

Thermodynamic performance evaluation of a cascade refrigeration system with mixed refrigerants: R744/R1270, R744/R717 and R744/RE170.

Auteurs : PAROLIN MASSUCHETTO L. H., NASCIMENTO do R. B. C., ROCHA DE CARVALHO S. M., et al.

Type d'article : Article, Article de la RIF

Résumé

This work evaluates the thermodynamic performance of three different mixed refrigerants: R744/R1270, R744/R717 and R744/RE170 in a cascade refrigeration system composed of two vapor compression cycles. Mixture composition and condensation temperature of the cascade heat exchanger were used as inputs in a parametric analysis, while outputs considered were: compressor power, refrigerant mass flow rate in both cycles, exergy destruction rate, exergetic efficiency and coefficient of performance. Systems were optimized for COP maximization, considering a fixed cooling rate of 100 kW in the evaporator. After op- timization, COP increased from 18% to 32% when compared to the values obtained for pure refrigerants. R744/RE170 mixture showed the best results with a COP of 2.34, increasing exergetic efficiency up to 30% and reducing refrigerant mass flow rate in the range from 6% to 34%, compressor power between 20% to 23% and exergy destruction rate was decreased around 31% to 36%.

Documents disponibles

Format PDF

Pages : 201-212

Disponible

  • Prix public

    20 €

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    Gratuit

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Détails

  • Titre original : Thermodynamic performance evaluation of a cascade refrigeration system with mixed refrigerants: R744/R1270, R744/R717 and R744/RE170.
  • Identifiant de la fiche : 30026838
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 106
  • Date d'édition : 10/2019
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2019.07.005

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