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Simulation numérique d'un système frigorifique à compression au CO2 bi-étagé équipé d'un refroidisseur intermédiaire externe.

Numerical simulation of CO2 two-stage compression refrigeration system with external intercooler.

Auteurs : NIU H., LI W., XIAO H., ZHANG X., ZHAO K., YANG Z., WANG B., SHI W.

Type d'article : Article de la RIF

Résumé

The CO2 two-stage compression refrigeration system is a feasible alternative to conventional refrigeration systems for logistics cold storage cooling that provides high efficiency and environmental protection. In a previous study, we proposed a two-stage compression refrigeration cycle with an external intercooler and performed a thermodynamic analysis. Based on that, a more comprehensive simulation analysis is performed herein using the validated models. The performance, optimal discharge pressure, and intermediate pressure are investigated using a high-pressure compressor with both fixed and variable speeds. The results show that the cooling-water temperature has a significant positive linear correlation with the optimal discharge pressure, whereas the evaporator-inlet air temperature has little effect at a fixed high- pressure compressor speed. When the high-pressure speed is adjusted to achieve the optimal intermediate pressure and discharge pressure simultaneously, the coefficient of performance increases by 4.5% compared with that of the fixed-speed system, while the cooling capacity decreases by 8.4%. The correlation of optimal discharge pressure and optimal intermediate pressure is given.

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Format PDF

Pages : 14-25

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    20 €

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Détails

  • Titre original : Numerical simulation of CO2 two-stage compression refrigeration system with external intercooler.
  • Identifiant de la fiche : 30031741
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 151
  • Date d'édition : 07/2023
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2023.02.012

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