Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System
Triple organic Rankine cycle (TORC) is gradually gaining interest, but the maximum thermal efficiencies (around 30%) are restricted by low critical temperatures of common working fluids (<320 °C). This paper proposes a high-temperature (up to 400 °C) TORC system to ramp up efficiency. A near-azeo...
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2023-11-01
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| Saila: | Energies |
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| Sarrera elektronikoa: | https://www.mdpi.com/1996-1073/16/23/7818 |
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| author | Pengcheng Li Chengxing Shu Jing Li Yandong Wang Yanxin Chen Xiao Ren Desuan Jie Xunfen Liu |
| author_facet | Pengcheng Li Chengxing Shu Jing Li Yandong Wang Yanxin Chen Xiao Ren Desuan Jie Xunfen Liu |
| author_sort | Pengcheng Li |
| collection | DOAJ |
| description | Triple organic Rankine cycle (TORC) is gradually gaining interest, but the maximum thermal efficiencies (around 30%) are restricted by low critical temperatures of common working fluids (<320 °C). This paper proposes a high-temperature (up to 400 °C) TORC system to ramp up efficiency. A near-azeotropic mixture biphenyl/diphenyl oxide (BDO), which has a stellar track record in the high-temperature ORC applications, is innovatively adopted as the top and middle ORC fluid simultaneously. Four conventional organic fluids are chosen for the bottom ORC. A mixing heat exchanger connects the top and middle ORCs to reduce irreversible loss. Thermodynamic analysis hints that the optimal performance is achieved on the use of benzene as the bottom fluid. The maximum thermal and exergy efficiencies are respectively 40.86% and 74.14%. The largest exergy destruction occurs inside the heat exchanger coupling the middle and bottom ORCs, accounting for above 30% of the total entropy generation. The levelized energy cost (LEC) is 0.0368 USD/kWh. Given the same heat source condition, the TORC system can boost the efficiency by 1.02% and drive down LEC by 0.0032 USD/kWh compared with a BDO mixture-based cascade ORC. The proposed system is promising in solar thermal power generation and Carnot battery applications using phase change materials for storage. |
| first_indexed | 2024-03-09T01:51:56Z |
| format | Article |
| id | doaj.art-7dab812e1b9f434c9fd57a08cc82b83a |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-09T01:51:56Z |
| publishDate | 2023-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-7dab812e1b9f434c9fd57a08cc82b83a2023-12-08T15:14:56ZengMDPI AGEnergies1996-10732023-11-011623781810.3390/en16237818Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle SystemPengcheng Li0Chengxing Shu1Jing Li2Yandong Wang3Yanxin Chen4Xiao Ren5Desuan Jie6Xunfen Liu7School of Automotive and Transportation Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230002, ChinaSchool of Automotive and Transportation Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230002, ChinaResearch Center for Sustainable Energy Technologies, Energy and Environment Institute, University of Hull, Hull HU6 7RX, UKHefei General Machinery Research Institute, 888 Changjiang Road, Hefei 230031, ChinaSchool of Automotive and Transportation Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230002, ChinaSchool of New Energy, China University of Petroleum, Qingdao 266580, ChinaSchool of Automotive and Transportation Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230002, ChinaSchool of Automotive and Transportation Engineering, Hefei University of Technology, 193 Tunxi Road, Hefei 230002, ChinaTriple organic Rankine cycle (TORC) is gradually gaining interest, but the maximum thermal efficiencies (around 30%) are restricted by low critical temperatures of common working fluids (<320 °C). This paper proposes a high-temperature (up to 400 °C) TORC system to ramp up efficiency. A near-azeotropic mixture biphenyl/diphenyl oxide (BDO), which has a stellar track record in the high-temperature ORC applications, is innovatively adopted as the top and middle ORC fluid simultaneously. Four conventional organic fluids are chosen for the bottom ORC. A mixing heat exchanger connects the top and middle ORCs to reduce irreversible loss. Thermodynamic analysis hints that the optimal performance is achieved on the use of benzene as the bottom fluid. The maximum thermal and exergy efficiencies are respectively 40.86% and 74.14%. The largest exergy destruction occurs inside the heat exchanger coupling the middle and bottom ORCs, accounting for above 30% of the total entropy generation. The levelized energy cost (LEC) is 0.0368 USD/kWh. Given the same heat source condition, the TORC system can boost the efficiency by 1.02% and drive down LEC by 0.0032 USD/kWh compared with a BDO mixture-based cascade ORC. The proposed system is promising in solar thermal power generation and Carnot battery applications using phase change materials for storage.https://www.mdpi.com/1996-1073/16/23/7818triple organic rankine cyclebiphenyl/diphenyl oxidethermal efficiencyexergy efficiencylevelized energy cost |
| spellingShingle | Pengcheng Li Chengxing Shu Jing Li Yandong Wang Yanxin Chen Xiao Ren Desuan Jie Xunfen Liu Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System Energies triple organic rankine cycle biphenyl/diphenyl oxide thermal efficiency exergy efficiency levelized energy cost |
| title | Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System |
| title_full | Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System |
| title_fullStr | Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System |
| title_full_unstemmed | Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System |
| title_short | Thermodynamic Investigation and Economic Evaluation of a High-Temperature Triple Organic Rankine Cycle System |
| title_sort | thermodynamic investigation and economic evaluation of a high temperature triple organic rankine cycle system |
| topic | triple organic rankine cycle biphenyl/diphenyl oxide thermal efficiency exergy efficiency levelized energy cost |
| url | https://www.mdpi.com/1996-1073/16/23/7818 |
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