Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valve
Mechanical subcooling is an efficient means of enhancing the performance of CO2 transcritical refrigeration systems. With the aim of further improving the system performance, this objective of this paper is the comparative analysis on mechanical subcooling CO2 transcritical refrigeration system inte...
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Elsevier
2025-01-01
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| Series: | Case Studies in Thermal Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X24016563 |
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| author | Zeye Zheng Qichao Yang Wenting Zhang Yuanyang Zhao Guangbin Liu Liansheng Li |
| author_facet | Zeye Zheng Qichao Yang Wenting Zhang Yuanyang Zhao Guangbin Liu Liansheng Li |
| author_sort | Zeye Zheng |
| collection | DOAJ |
| description | Mechanical subcooling is an efficient means of enhancing the performance of CO2 transcritical refrigeration systems. With the aim of further improving the system performance, this objective of this paper is the comparative analysis on mechanical subcooling CO2 transcritical refrigeration system integrated with throttling valve (MCVS) and expander (MCES). A thermodynamic model for parametric analysis was developed on energy, exergy and economic perspectives. The model is validated with literature data. The simulation results indicate that there exists simultaneously optimum discharge pressure and subcooling degree maximizes the COP of MCVS and MCES. While the cooling capacity of MCES is 4.30 %–5.67 % lower than that of MCVS at a given CO2 mass flow rate, the incorporation of expansion work recovery leads to a total power consumption reduction of 8.53 %–11.29 % for MCES compared to MCVS, resulting in a corresponding increase in COP by 10.01 %–11.11 %. Additionally, exergy efficiency is improved by 10.74 %–11.48 %. Despite the addition of an expander in the MCES system, it offers advantages such as a smaller scale and lower power consumption for the mechanical subcooling system, ultimately leading to superior economic benefits compared with the MCVS system. |
| format | Article |
| id | doaj-art-19667772ccad4daea236c6168924bc80 |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-19667772ccad4daea236c6168924bc802025-01-08T04:52:42ZengElsevierCase Studies in Thermal Engineering2214-157X2025-01-0165105625Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valveZeye Zheng0Qichao Yang1Wenting Zhang2Yuanyang Zhao3Guangbin Liu4Liansheng Li5College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, ChinaCorresponding author.; College of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, ChinaCollege of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, ChinaCollege of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, ChinaCollege of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, ChinaCollege of Electromechanical Engineering, Qingdao University of Science and Technology, Qingdao, 266061, ChinaMechanical subcooling is an efficient means of enhancing the performance of CO2 transcritical refrigeration systems. With the aim of further improving the system performance, this objective of this paper is the comparative analysis on mechanical subcooling CO2 transcritical refrigeration system integrated with throttling valve (MCVS) and expander (MCES). A thermodynamic model for parametric analysis was developed on energy, exergy and economic perspectives. The model is validated with literature data. The simulation results indicate that there exists simultaneously optimum discharge pressure and subcooling degree maximizes the COP of MCVS and MCES. While the cooling capacity of MCES is 4.30 %–5.67 % lower than that of MCVS at a given CO2 mass flow rate, the incorporation of expansion work recovery leads to a total power consumption reduction of 8.53 %–11.29 % for MCES compared to MCVS, resulting in a corresponding increase in COP by 10.01 %–11.11 %. Additionally, exergy efficiency is improved by 10.74 %–11.48 %. Despite the addition of an expander in the MCES system, it offers advantages such as a smaller scale and lower power consumption for the mechanical subcooling system, ultimately leading to superior economic benefits compared with the MCVS system.http://www.sciencedirect.com/science/article/pii/S2214157X24016563CO2 transcritical refrigerationMechanical subcoolingExpanderThrottling valveThermodynamic analysis |
| spellingShingle | Zeye Zheng Qichao Yang Wenting Zhang Yuanyang Zhao Guangbin Liu Liansheng Li Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valve Case Studies in Thermal Engineering CO2 transcritical refrigeration Mechanical subcooling Expander Throttling valve Thermodynamic analysis |
| title | Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valve |
| title_full | Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valve |
| title_fullStr | Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valve |
| title_full_unstemmed | Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valve |
| title_short | Thermodynamic analysis and comparison of mechanical subcooling transcritical CO2 refrigeration system with expander and throttling valve |
| title_sort | thermodynamic analysis and comparison of mechanical subcooling transcritical co2 refrigeration system with expander and throttling valve |
| topic | CO2 transcritical refrigeration Mechanical subcooling Expander Throttling valve Thermodynamic analysis |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X24016563 |
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