Thermodynamic Analysis of Transcritical CO<sub>2</sub> Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling
The new configuration of a transcritical CO<sub>2</sub> 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 s...
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MDPI AG
2019-09-01
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| Series: | Entropy |
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| Online Access: | https://www.mdpi.com/1099-4300/21/9/874 |
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| author | Ruansong Fu Jinhui Wang Minfeng Zheng Kaihong Yu Xi Liu Xuelai Li |
| author_facet | Ruansong Fu Jinhui Wang Minfeng Zheng Kaihong Yu Xi Liu Xuelai Li |
| author_sort | Ruansong Fu |
| collection | DOAJ |
| description | The new configuration of a transcritical CO<sub>2</sub> 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 CO<sub>2</sub> 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. |
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| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-11T18:00:51Z |
| publishDate | 2019-09-01 |
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| spelling | doaj.art-450907f5d2314fd2b6636e3169d5aec92022-12-22T04:10:29ZengMDPI AGEntropy1099-43002019-09-0121987410.3390/e21090874e21090874Thermodynamic Analysis of Transcritical CO<sub>2</sub> Ejector Expansion Refrigeration Cycle with Dedicated Mechanical SubcoolingRuansong Fu0Jinhui Wang1Minfeng Zheng2Kaihong Yu3Xi Liu4Xuelai Li5College of Chemical Engineering, Fuzhou University, Fuzhou 350116, ChinaCollege of Chemical Engineering, Fuzhou University, Fuzhou 350116, ChinaCollege of Ecological Environment and Urban Construction, Fujian University of Technology, Fuzhou 350118, ChinaCollege of Chemical Engineering, Fuzhou University, Fuzhou 350116, ChinaCollege of Chemical Engineering, Fuzhou University, Fuzhou 350116, ChinaCollege of Chemical Engineering, Fuzhou University, Fuzhou 350116, ChinaThe new configuration of a transcritical CO<sub>2</sub> 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 CO<sub>2</sub> 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.https://www.mdpi.com/1099-4300/21/9/874transcritical CO<sub>2</sub> cyclethermoelectric subcoolingmechanical subcoolingejector |
| spellingShingle | Ruansong Fu Jinhui Wang Minfeng Zheng Kaihong Yu Xi Liu Xuelai Li Thermodynamic Analysis of Transcritical CO<sub>2</sub> Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling Entropy transcritical CO<sub>2</sub> cycle thermoelectric subcooling mechanical subcooling ejector |
| title | Thermodynamic Analysis of Transcritical CO<sub>2</sub> Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling |
| title_full | Thermodynamic Analysis of Transcritical CO<sub>2</sub> Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling |
| title_fullStr | Thermodynamic Analysis of Transcritical CO<sub>2</sub> Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling |
| title_full_unstemmed | Thermodynamic Analysis of Transcritical CO<sub>2</sub> Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling |
| title_short | Thermodynamic Analysis of Transcritical CO<sub>2</sub> Ejector Expansion Refrigeration Cycle with Dedicated Mechanical Subcooling |
| title_sort | thermodynamic analysis of transcritical co sub 2 sub ejector expansion refrigeration cycle with dedicated mechanical subcooling |
| topic | transcritical CO<sub>2</sub> cycle thermoelectric subcooling mechanical subcooling ejector |
| url | https://www.mdpi.com/1099-4300/21/9/874 |
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