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Optimization analysis of compression heat utilization in a stand-alone liquid air energy storage system
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Xindong WANG1, 2, Yihong LI3, 4, Bo LI1, 2, 3, Jian GAO1, 2, Junjie WANG1, 2, 3, 4
Thermal Power Generation | 2026, 55(2) : 49 - 57
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Thermal Power Generation | 2026, 55(2): 49-57
• Energy storage materials, devices, and systems •
Optimization analysis of compression heat utilization in a stand-alone liquid air energy storage system
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Xindong WANG1, 2, Yihong LI3, 4, Bo LI1, 2, 3, Jian GAO1, 2, Junjie WANG1, 2, 3, 4
Affiliations
  • 1.Zhonglv Zhongke Energy Storage Technology Co., Ltd., Beijing 100020, China
  • 2.China Green Development Investment Group Co., Ltd., Beijing 100020, China
  • 3.Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China
  • 4.University of Chinese Academy of Sciences, School of Future Technology, Beijing 100049, China
Published: 2026-02-25 doi: 10.19666/j.rlfd.202502019
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A stand-alone liquid air energy storage (LAES) system with a water-oil combined heat storage system was constructed, and the effects of compression stages, expansion stages, and heat-storage water temperature on the system’s round-trip efficiency and compression heat utilization were analyzed. The results indicate that increasing the number of compression stages will reduce the round-trip efficiency, and the optimal number of compression stages is two. The optimal number of expansion stages is one more than the number of compression stages. Within the temperature range of 25~65 ℃, increasing the heat-storage water temperature can improve the system’s round-trip efficiency and the utilization degree of compression heat. However, the system efficiency will no longer increase when the temperature of the heat-storage water exceeds 65 ℃. Under optimal conditions, the system with two compression stages, three expansion stages, and a heat-storage water temperature of 65 ℃ has a compression heat surplus ratio of 0.349 and a round-trip efficiency of 0.622. The study provides a theoretical reference for optimizing the compression heat utilization process in LAES systems.

liquid air energy storage  /  compression heat  /  heat storage process  /  efficiency optimization
Xindong WANG, Yihong LI, Bo LI, Jian GAO, Junjie WANG. Optimization analysis of compression heat utilization in a stand-alone liquid air energy storage system[J]. Thermal Power Generation, 2026 , 55 (2) : 49 -57 . DOI: 10.19666/j.rlfd.202502019
Funding
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  • National Key Research and Development Program of China(2024YFE0208500)
  • Technological Innovation Projects of China Green Development Investment Group Co., Ltd.(202309CHDD020)
Appendix
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Year 2026 volume 55 Issue 2
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Article Info
doi: 10.19666/j.rlfd.202502019
  • Receive Date：2025-02-14
  • Online Date：2026-08-14
  • Published：2026-02-25
Article Data
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History
  • Received：2025-02-14
  • Revised：2025-03-14
  • Accepted：2025-03-26
Funding
National Key Research and Development Program of China(2024YFE0208500)
Technological Innovation Projects of China Green Development Investment Group Co., Ltd.(202309CHDD020)
Affiliations
    1.Zhonglv Zhongke Energy Storage Technology Co., Ltd., Beijing 100020, China
    2.China Green Development Investment Group Co., Ltd., Beijing 100020, China
    3.Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China
    4.University of Chinese Academy of Sciences, School of Future Technology, Beijing 100049, China
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https://castjournals.cast.org.cn/joweb/rlfd/EN/10.19666/j.rlfd.202502019
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