Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production
Efficient energy storage technology is a crucial step in achieving the broad deployment of renewable energies. Thermochemical heat transformer (THT), which rely on reversible gas–solid reactions, can provide an option for efficient energy storage and heat upgrade. In this article, a pressurisation-a...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2023
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| Online Access: | https://hdl.handle.net/10356/172262 |
| _version_ | 1811684617873260544 |
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| author | Li, Wei Zhang, Lianjie Ling, Xiang |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Li, Wei Zhang, Lianjie Ling, Xiang |
| author_sort | Li, Wei |
| collection | NTU |
| description | Efficient energy storage technology is a crucial step in achieving the broad deployment of renewable energies. Thermochemical heat transformer (THT), which rely on reversible gas–solid reactions, can provide an option for efficient energy storage and heat upgrade. In this article, a pressurisation-assisted sorption THT system driven by low-grade solar thermal energy is proposed to meet the heat demand of domestic hot water (DHW) production, and different temperature rises can be realised by regulating the water vapour pressure. The thermodynamic and economic performances of the THT systems employing ten kinds of salt hydrates are investigated under various operating conditions. The results indicate that most salts-based THT systems enable output temperatures higher than 60 °C. Two-stage pressurisation systems can further elevate the temperature lift but at the cost of thermodynamic performance. SrBr2·6H2O, K2CO3·1.5H2O, and LiOH·H2O are more promising hydrates for the THT system by taking energy density, temperature lift, and thermo-economic performance into account. Compared to the classical TCES cycle, the temperature lifts attained by the above salts-based single-stage and two-stage pressurisation THT systems are 17.6–19.9 °C and 32.2–37.8 °C, respectively. Multi-objective optimisation results suggest that the optimum exergy efficiency for the SrBr2-, K2CO3-, and LiOH-based systems are 82.47%, 55.08%, and 63.97%, and the corresponding levelized energy costs (LECs) are 0.3549, 0.7132, and 0.5721 $/kWh, respectively. The results of this study demonstrate the significant potential of developing such pressurisation-assisted THT system for heat upgradation targeting DHW production. |
| first_indexed | 2024-10-01T04:31:29Z |
| format | Journal Article |
| id | ntu-10356/172262 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:31:29Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | ntu-10356/1722622023-12-04T07:21:53Z Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production Li, Wei Zhang, Lianjie Ling, Xiang School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Pressurisation-Assisted Thermochemical Heat Salt Hydrate Efficient energy storage technology is a crucial step in achieving the broad deployment of renewable energies. Thermochemical heat transformer (THT), which rely on reversible gas–solid reactions, can provide an option for efficient energy storage and heat upgrade. In this article, a pressurisation-assisted sorption THT system driven by low-grade solar thermal energy is proposed to meet the heat demand of domestic hot water (DHW) production, and different temperature rises can be realised by regulating the water vapour pressure. The thermodynamic and economic performances of the THT systems employing ten kinds of salt hydrates are investigated under various operating conditions. The results indicate that most salts-based THT systems enable output temperatures higher than 60 °C. Two-stage pressurisation systems can further elevate the temperature lift but at the cost of thermodynamic performance. SrBr2·6H2O, K2CO3·1.5H2O, and LiOH·H2O are more promising hydrates for the THT system by taking energy density, temperature lift, and thermo-economic performance into account. Compared to the classical TCES cycle, the temperature lifts attained by the above salts-based single-stage and two-stage pressurisation THT systems are 17.6–19.9 °C and 32.2–37.8 °C, respectively. Multi-objective optimisation results suggest that the optimum exergy efficiency for the SrBr2-, K2CO3-, and LiOH-based systems are 82.47%, 55.08%, and 63.97%, and the corresponding levelized energy costs (LECs) are 0.3549, 0.7132, and 0.5721 $/kWh, respectively. The results of this study demonstrate the significant potential of developing such pressurisation-assisted THT system for heat upgradation targeting DHW production. This work was supported by the National Natural Science Foundation of China (No. 52204420) and Natural Science Research of Jiangsu Higher Education Institutions of China (NO. 22KJB480005). 2023-12-04T07:21:53Z 2023-12-04T07:21:53Z 2023 Journal Article Li, W., Zhang, L. & Ling, X. (2023). Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production. Energy Conversion and Management, 277, 116644-. https://dx.doi.org/10.1016/j.enconman.2022.116644 0196-8904 https://hdl.handle.net/10356/172262 10.1016/j.enconman.2022.116644 2-s2.0-85145828039 277 116644 en Energy Conversion and Management © 2022 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Mechanical engineering Pressurisation-Assisted Thermochemical Heat Salt Hydrate Li, Wei Zhang, Lianjie Ling, Xiang Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production |
| title | Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production |
| title_full | Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production |
| title_fullStr | Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production |
| title_full_unstemmed | Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production |
| title_short | Thermo-economic assessment of salt hydrate-based thermochemical heat transformer system: heat upgrade for matching domestic hot water production |
| title_sort | thermo economic assessment of salt hydrate based thermochemical heat transformer system heat upgrade for matching domestic hot water production |
| topic | Engineering::Mechanical engineering Pressurisation-Assisted Thermochemical Heat Salt Hydrate |
| url | https://hdl.handle.net/10356/172262 |
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