IIR document

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

Author(s) : NIU H., LI W., XIAO H., ZHANG X., ZHAO K., YANG Z., WANG B., SHI W.

Type of article: IJR article


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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Pages: 14-25


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  • Original title: Numerical simulation of CO2 two-stage compression refrigeration system with external intercooler.
  • Record ID : 30031741
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 151
  • Publication date: 2023/07
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2023.02.012


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