Thermodynamic analysis of a novel multi-layer packed bed cold energy storage with low exergy loss for liquid air energy storage system

Xingyu Wang, Chen Wang, Ying Xu, Ziao Zhang, Peng Han, Yongliang Li and Xiaohui She

Renewable Energy, 2025, vol. 240, issue C

Abstract: Packed bed cold energy storage (PBCES) is an efficient storage method for liquid air energy storage (LAES) systems. During the charging and discharging processes, the PBCES experiences a significant temperature gradient in the thermocline layer. This leads to significant exergy loss during the storage process which can reduce the performance of the LAES. To address this issue, this paper proposes a novel multi-layer PBCES by adding air layers as thermal resistance. The uniform temperature layer and thermocline layer are divided based on the temperature gradient minimization of solid particles to reduce the exergy loss. The results show that the exergy loss ratio of the PBCES is decreased to 3.9 % with a storage time of 6 h, which is 26.4 % relatively lower than the traditional PBCES. Besides, the exergy efficiency of the whole cycle is increased from 86.1 % to 87.4 %. The heat transfer from the ambient to the solid particles significantly affects the cold exergy loss of the PBCES, which accounts for 59 % of the total value. This paper provides a reference and basis for the optimization of the PBCES with low exergy loss for the liquid air energy storage system.

Keywords: Liquid air energy storage; Packed bed cold energy storage; Thermocline; Exergy (search for similar items in EconPapers)
Date: 2025
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:240:y:2025:i:c:s0960148124023395

DOI: 10.1016/j.renene.2024.122271

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