Mechanical Booster Pump-Assisted Thermochemical Mode for Low-Grade Heat Storage and Upgrading: A Thermodynamic Study
To assure stable and dependable functioning of the thermochemical energy storage (TCES) system under unstable low-grade heat temperatures, three mechanical booster pump-assisted TCES (MBP-assisted TCES) modes operating with SrBr2·H2O/H2O, LiOH/H2O, and CaCl2·H2O/H2O are proposed for the application...
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| Format: | Article |
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Frontiers Media S.A.
2022-03-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2022.851611/full |
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| author | Tao Zeng Tao Zeng Tao Zeng Jun Li Jun Li Jun Li Lisheng Deng Lisheng Deng Lisheng Deng Zhaohong He Zhaohong He Zhaohong He Noriyuki Kobayashi Rongjun Wu Hongyu Huang Hongyu Huang Hongyu Huang |
| author_facet | Tao Zeng Tao Zeng Tao Zeng Jun Li Jun Li Jun Li Lisheng Deng Lisheng Deng Lisheng Deng Zhaohong He Zhaohong He Zhaohong He Noriyuki Kobayashi Rongjun Wu Hongyu Huang Hongyu Huang Hongyu Huang |
| author_sort | Tao Zeng |
| collection | DOAJ |
| description | To assure stable and dependable functioning of the thermochemical energy storage (TCES) system under unstable low-grade heat temperatures, three mechanical booster pump-assisted TCES (MBP-assisted TCES) modes operating with SrBr2·H2O/H2O, LiOH/H2O, and CaCl2·H2O/H2O are proposed for the application of heat storage and upgrading. The operating modes are the MBP-assisted charging mode (A mode), MBP-assisted discharging mode (B mode), and MBP-assisted charging and discharging mode (C mode). A thermodynamic model is established to evaluate the influences of condensing temperature, compression ratio, MBP isentropic efficiency, and reaction advancement on the heat source temperature and system performance from both energy and exergy perspectives. The results indicate that compared with the other two modes, the B mode is more effective in reducing the heat source temperature and achieving better system performance. Compared to the conventional TCES mode, the proposed modes can operate at lower heat source temperatures that can be minimized by up to 21∼25°C by employing the B mode with a compression ratio of 3.0 at the condensing temperature of 24°C. The B mode with SrBr2·H2O/H2O exhibits the highest energy and exergy efficiencies that the coefficients of performance based on total energy input and electric power consumed (COPtotal and COPelec), and exergy efficiency varies in the range of 0.53∼0.59, 7.4∼19.6, and 0.78∼0.95, respectively. In contrast, CaCl2·H2O/H2O shows the lowest system performance, but a higher heat output temperature can be required. In addition, to maintain the MBP discharge temperature below 180°C, there is a maximum permitted compression ratio that varies depending on the operating modes, operating conditions, and working pairs. The findings of this research can be used as theoretical references and suggestions for selecting MBP-assisted TCES modes, operating conditions, and working pairs for low-grade heat storage and upgrading. |
| first_indexed | 2024-12-20T23:17:09Z |
| format | Article |
| id | doaj.art-c4b45b84b9c842baa252b5e5137cad73 |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-12-20T23:17:09Z |
| publishDate | 2022-03-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-c4b45b84b9c842baa252b5e5137cad732022-12-21T19:23:37ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2022-03-011010.3389/fenrg.2022.851611851611Mechanical Booster Pump-Assisted Thermochemical Mode for Low-Grade Heat Storage and Upgrading: A Thermodynamic StudyTao Zeng0Tao Zeng1Tao Zeng2Jun Li3Jun Li4Jun Li5Lisheng Deng6Lisheng Deng7Lisheng Deng8Zhaohong He9Zhaohong He10Zhaohong He11Noriyuki Kobayashi12Rongjun Wu13Hongyu Huang14Hongyu Huang15Hongyu Huang16Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, ChinaKey Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, ChinaGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, ChinaKey Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, ChinaGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, ChinaKey Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, ChinaGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, ChinaKey Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, ChinaDepartment of Chemical Systems Engineering, Nagoya University, Nagoya, JapanDepartment of Chemical Systems Engineering, Nagoya University, Nagoya, JapanGuangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, ChinaKey Laboratory of Renewable Energy, Chinese Academy of Sciences, Guangzhou, ChinaSouthern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, ChinaTo assure stable and dependable functioning of the thermochemical energy storage (TCES) system under unstable low-grade heat temperatures, three mechanical booster pump-assisted TCES (MBP-assisted TCES) modes operating with SrBr2·H2O/H2O, LiOH/H2O, and CaCl2·H2O/H2O are proposed for the application of heat storage and upgrading. The operating modes are the MBP-assisted charging mode (A mode), MBP-assisted discharging mode (B mode), and MBP-assisted charging and discharging mode (C mode). A thermodynamic model is established to evaluate the influences of condensing temperature, compression ratio, MBP isentropic efficiency, and reaction advancement on the heat source temperature and system performance from both energy and exergy perspectives. The results indicate that compared with the other two modes, the B mode is more effective in reducing the heat source temperature and achieving better system performance. Compared to the conventional TCES mode, the proposed modes can operate at lower heat source temperatures that can be minimized by up to 21∼25°C by employing the B mode with a compression ratio of 3.0 at the condensing temperature of 24°C. The B mode with SrBr2·H2O/H2O exhibits the highest energy and exergy efficiencies that the coefficients of performance based on total energy input and electric power consumed (COPtotal and COPelec), and exergy efficiency varies in the range of 0.53∼0.59, 7.4∼19.6, and 0.78∼0.95, respectively. In contrast, CaCl2·H2O/H2O shows the lowest system performance, but a higher heat output temperature can be required. In addition, to maintain the MBP discharge temperature below 180°C, there is a maximum permitted compression ratio that varies depending on the operating modes, operating conditions, and working pairs. The findings of this research can be used as theoretical references and suggestions for selecting MBP-assisted TCES modes, operating conditions, and working pairs for low-grade heat storage and upgrading.https://www.frontiersin.org/articles/10.3389/fenrg.2022.851611/fullthermochemical heat storagelow-grade heatmechanical booster pumpthermodynamic analysisheat upgrading |
| spellingShingle | Tao Zeng Tao Zeng Tao Zeng Jun Li Jun Li Jun Li Lisheng Deng Lisheng Deng Lisheng Deng Zhaohong He Zhaohong He Zhaohong He Noriyuki Kobayashi Rongjun Wu Hongyu Huang Hongyu Huang Hongyu Huang Mechanical Booster Pump-Assisted Thermochemical Mode for Low-Grade Heat Storage and Upgrading: A Thermodynamic Study Frontiers in Energy Research thermochemical heat storage low-grade heat mechanical booster pump thermodynamic analysis heat upgrading |
| title | Mechanical Booster Pump-Assisted Thermochemical Mode for Low-Grade Heat Storage and Upgrading: A Thermodynamic Study |
| title_full | Mechanical Booster Pump-Assisted Thermochemical Mode for Low-Grade Heat Storage and Upgrading: A Thermodynamic Study |
| title_fullStr | Mechanical Booster Pump-Assisted Thermochemical Mode for Low-Grade Heat Storage and Upgrading: A Thermodynamic Study |
| title_full_unstemmed | Mechanical Booster Pump-Assisted Thermochemical Mode for Low-Grade Heat Storage and Upgrading: A Thermodynamic Study |
| title_short | Mechanical Booster Pump-Assisted Thermochemical Mode for Low-Grade Heat Storage and Upgrading: A Thermodynamic Study |
| title_sort | mechanical booster pump assisted thermochemical mode for low grade heat storage and upgrading a thermodynamic study |
| topic | thermochemical heat storage low-grade heat mechanical booster pump thermodynamic analysis heat upgrading |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2022.851611/full |
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