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Performance evaluation of NH3/CO2 cascade refrigeration system with ejector subcooling for low-temperature circuit

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Journal:International Journal of Refrigeration
Key Words:Cascade refrigeration system; Ejector; Subcooling; Thermodynamic analysis; System performance
Abstract:An NH3/CO2 cascade refrigeration system with ejector subcooling (ESCRS) is proposed in this paper. Based on the basic principle of thermodynamics, the mathematical model of the refrigeration system is established and thermodynamic analysis is carried out to obtain the influence of main working parameters on system performance. Compared with the conventional cascade refrigeration system (CCRS), it is concluded that the performance of ESCRS is better than that of the CCRS. Within a certain range, the greater the subcooling degree, the more obvious the decrease of power consumption of low-temperature compressor, the greater the discharge temperature of NH3 compressor decreases, and the more obvious the increase of system COP and exergy efficiency. Under typical operating conditions, the COP and exergy efficiency of the system proposed in this paper is about 5.4% and 4.8% higher than that of the CCRS.
Indexed by:Journal paper
Volume:136
Page Number:162-171
Translation or Not:no
Date of Publication:2022-01-05
Included Journals:SCI

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