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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

Summary

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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Details

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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Indexing

Themes: CO2;
Cold chain, interfaces
Keywords: CO2; R744; Transcritical cycle; Simulation; Intercooler; Two-stage system; Modelling; Prototype; Expérimentation; Cold chain; Performance