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Thermodynamic Analysis of Transcritical CO2 Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling

1
College of Chemical Engineering, Fuzhou University, Fuzhou 350116, China
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College of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou 350118, China
3
State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350116, China
*
Authors to whom correspondence should be addressed.
Entropy 2019, 21(9), 874; https://doi.org/10.3390/e21090874
Received: 9 July 2019 / Revised: 16 August 2019 / Accepted: 28 August 2019 / Published: 8 September 2019
(This article belongs to the Section Thermodynamics)
The new configuration of a transcritical CO2 ejector expansion refrigeration cycle combined with a dedicated mechanical subcooling cycle (EMS) is proposed. Three mass ratios of R32/R1234ze(Z) (0.4/0.6, 0.6/0.4, and 0.8/0.2) were selected as the refrigerants of the mechanical subcooling cycle (MS) to further explore the possibility of improving the EMS cycle’s performance. The thermodynamic performances of the new cycle were evaluated using energetic and exergetic methods and compared with those of the transcritical CO2 ejector expansion cycle integrated with a thermoelectric subcooling system (ETS). The results showed that the proposed cycle presents significant advantages over the ETS cycle in terms of the ejector performance and the system energetic and exergetic performances. Taking the EMS cycle using R32/R1234ze(Z) (0.6/0.4) as the MS refrigerant as an example, the improvements in the coefficient of performance and system exergy efficiency were able to reach up to 10.27% and 15.56%, respectively, at an environmental temperature of 35 °C and evaporation temperature of −5 °C. Additionally, the advantages of the EMS cycle were more pronounced at higher environmental temperatures. View Full-Text
Keywords: transcritical CO2 cycle; thermoelectric subcooling; mechanical subcooling; ejector transcritical CO2 cycle; thermoelectric subcooling; mechanical subcooling; ejector
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Fu, R.; Wang, J.; Zheng, M.; Yu, K.; Liu, X.; Li, X. Thermodynamic Analysis of Transcritical CO2 Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling. Entropy 2019, 21, 874.

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