Paper Info
Title
Thermodynamic Analysis of Transcritical CO2 Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling.
Abstract
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 degrees C and evaporation temperature of -5 degrees C. Additionally, the advantages of the EMS cycle were more pronounced at higher environmental temperatures.
Year
DOI
Venue
2019
10.3390/e21090874
ENTROPY
Keywords
Field
DocType
transcritical CO2 cycle,thermoelectric subcooling,mechanical subcooling,ejector
Refrigeration,Coefficient of performance,Mathematical optimization,Refrigerant,Transcritical cycle,Subcooling,Injector,Exergy efficiency,Thermoelectric effect,Mathematics,Nuclear engineering
Journal
Volume
Issue
Citations 
21
9
0
PageRank 
References 
Authors
0.34
0
6
Name
Order
Citations
PageRank
Ruansong Fu100.34
Jinhui Wang243.78
Minfeng Zheng300.34
Kaihong Yu400.34
Xi Liu500.34
Xuelai Li600.34