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Cyclic performance of cascaded latent heat thermocline energy storage systems for high-temperature applications

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  • ELSihy, ELSaeed Saad
  • Xu, Chao
  • Du, Xiaoze

Abstract

The cyclic performance of cascaded latent heat thermocline energy storage systems for high-temperature applications is presented. To investigate this performance, a transient, two-phase numerical model is established based on a concentric-dispersion approach. The storage unit is filled with encapsulated phase change materials (PCMs) having different melting points. Molten salt serves as a heat transfer fluid. The general behavior of the three-PCM cascade system is firstly analyzed. Secondly, the effects of PCMs filling fractions of two and three cascade structures are studied. Lastly, the effects of latent heat and capsule diameter are investigated based on the optimal cascade structure performance of the above analyses. The results show that as the volume fraction of bottom PCM increases than top PCM, the system's performance enhances in terms of heat storage and release. The arrangement wherein the bottom PCM occupies half of the bed height has the highest capacity and total utilization ratios of 83% and 40.5%, respectively. The effect of latent heat has a considerable impact on cyclic performance. The scenario wherein top and bottom PCMs have high latent heat, exhibits the greatest benefits compared to other scenarios. The results also show that the smaller capsule size achieves the best behavior. When the capsule diameter increases from 1.9 cm to 4.2 cm, the total storage capacity decreases by 34.8%; the energy recovered declines by 10%; the total utilization ratio decreases by 13.77%, and the capacity ratio decreases by 1.7%.

Suggested Citation

  • ELSihy, ELSaeed Saad & Xu, Chao & Du, Xiaoze, 2022. "Cyclic performance of cascaded latent heat thermocline energy storage systems for high-temperature applications," Energy, Elsevier, vol. 239(PC).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pc:s0360544221024774
    DOI: 10.1016/j.energy.2021.122229
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    References listed on IDEAS

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    Cited by:

    1. ELSihy, ELSaeed Saad & Mokhtar, Omar & Xu, Chao & Du, Xiaoze & Adel, Mohamed, 2023. "Cyclic performance characterization of a high-temperature thermal energy storage system packed with rock/slag pebbles granules combined with encapsulated phase change materials," Applied Energy, Elsevier, vol. 331(C).
    2. Mao, Qianjun & Zhang, Yufei, 2023. "Effect of unsteady heat source condition on thermal performance for cascaded latent heat storage packed bed," Energy, Elsevier, vol. 284(C).
    3. Wu, Jiani & Fan, Jianhua & Ma, Tianzeng & Kong, Weiqiang & Chang, Zheshao & Li, Xin, 2024. "Identifying driving factors in cascaded packed bed latent thermal energy storage: An experimental validation," Renewable Energy, Elsevier, vol. 224(C).
    4. Xinming Xi & Zicheng Zhang & Huimin Wei & Zeyu Chen & Xiaoze Du, 2023. "Experimental Study of Simultaneous Charging and Discharging Process in Thermocline Phase Change Heat Storage System Based on Solar Energy," Sustainability, MDPI, vol. 15(9), pages 1-17, April.
    5. Anagnostopoulos, Argyrios & Xenitopoulos, Theofilos & Ding, Yulong & Seferlis, Panos, 2024. "An integrated machine learning and metaheuristic approach for advanced packed bed latent heat storage system design and optimization," Energy, Elsevier, vol. 297(C).
    6. Mao, Qianjun & Cao, Wenlong, 2023. "Effect of variable capsule size on energy storage performances in a high-temperature three-layered packed bed system," Energy, Elsevier, vol. 273(C).
    7. ELSihy, ELSaeed Saad & Cai, Changrui & Li, Zhenpeng & Du, Xiaoze & Wang, Zuyuan, 2024. "Performance investigation on the cascaded packed bed thermal energy storage system with encapsulated nano-enhanced phase change materials for high-temperature applications," Energy, Elsevier, vol. 293(C).

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