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Multi-level configuration and optimization of a thermal energy storage system using a metal hydride pair

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  • Feng, Penghui
  • Wu, Zhen
  • Zhang, Yang
  • Yang, Fusheng
  • Wang, Yuqi
  • Zhang, Zaoxiao

Abstract

Metal hydride thermal energy storage (TES) system is an attractive option for the concentrated solar power. In this article, a multi-level configuration is proposed to intensify the discharging process of TES system using MgH2/LaNi5 pair. The discharging process is simulated by establishing a mathematical model, which is solved by COMSOL Multiphysics v5.1. The multi-layer structure of storage units is simplified by the conversion of porosity and thermal conductivity. It is found that the multi-level configuration mitigates the non-uniform reaction along the oil flow direction so as to enhance the overall discharging performance effectively, such as the decrease of discharging time from 17,350 s to 14,688 s and the increase of output temperature by ∼5 °C. Meanwhile, the optimum number of levels is determined between 4 and 5 according to the effect of the number of levels on the discharging performance. Furthermore, it is revealed that the optimum allocation principle of storage materials is to maintain the same discharging time for all the subsystems.

Suggested Citation

  • Feng, Penghui & Wu, Zhen & Zhang, Yang & Yang, Fusheng & Wang, Yuqi & Zhang, Zaoxiao, 2018. "Multi-level configuration and optimization of a thermal energy storage system using a metal hydride pair," Applied Energy, Elsevier, vol. 217(C), pages 25-36.
    • Handle: RePEc:eee:appene:v:217:y:2018:i:c:p:25-36
    DOI: 10.1016/j.apenergy.2018.02.138
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    2. Bhogilla, Satya Sekhar, 2021. "Numerical simulation of metal hydride based thermal energy storage system for concentrating solar power plants," Renewable Energy, Elsevier, vol. 172(C), pages 1013-1020.
    3. Lin, Xi & Zhu, Qi & Leng, Haiyan & Yang, Hongguang & Lyu, Tao & Li, Qian, 2019. "Numerical analysis of the effects of particle radius and porosity on hydrogen absorption performances in metal hydride tank," Applied Energy, Elsevier, vol. 250(C), pages 1065-1072.
    4. Wang, Di & Wang, Yuqi & Huang, Zhuonan & Yang, Fusheng & Wu, Zhen & Zheng, Lan & Wu, Le & Zhang, Zaoxiao, 2019. "Design optimization and sensitivity analysis of the radiation mini-channel metal hydride reactor," Energy, Elsevier, vol. 173(C), pages 443-456.
    5. Feng, Penghui & Liu, Yang & Ayub, Iqra & Wu, Zhen & Yang, Fusheng & Zhang, Zaoxiao, 2019. "Techno-economic analysis of screening metal hydride pairs for a 910 MWhth thermal energy storage system," Applied Energy, Elsevier, vol. 242(C), pages 148-156.
    6. Shi, Tao & Xu, Huijin, 2022. "Integration of hydrogen storage and heat storage in thermochemical reactors enhanced with optimized topological structures: Charging process," Applied Energy, Elsevier, vol. 327(C).
    7. Ye, Yang & Yue, Yi & Lu, Jianfeng & Ding, Jing & Wang, Weilong & Yan, Jinyue, 2021. "Enhanced hydrogen storage of a LaNi5 based reactor by using phase change materials," Renewable Energy, Elsevier, vol. 180(C), pages 734-743.
    8. Ayub, Iqra & Nasir, Muhammad Salman & Liu, Yang & Munir, Anjum & Yang, Fusheng & Zhang, Zaoxiao, 2020. "Performance improvement of solar bakery unit by integrating with metal hydride based solar thermal energy storage reactor," Renewable Energy, Elsevier, vol. 161(C), pages 1011-1024.
    9. Wang, Di & Wang, Yuqi & Wang, Feng & Zheng, Shuaishuai & Guan, Sinan & Zheng, Lan & Wu, Le & Yang, Xin & Lv, Ming & Zhang, Zaoxiao, 2022. "Optimal design of disc mini-channel metal hydride reactor with high hydrogen storage efficiency," Applied Energy, Elsevier, vol. 308(C).

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