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Dynamic characteristics comparative simulation of TS-CAES system integrated with low melting point molten salt TES

Author

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  • Wang, Qianting
  • Zhang, Cancan
  • Wu, Yuting

Abstract

Compressed Air Energy Storage (CAES) is considered one of the most promising energy storage technologies due to its large-scale, long-term, and high-efficiency characteristics. Thermal Storage Compressed Air Energy Storage (TS–CAES) further enhances system performance by efficiently recovering and utilizing compression heat through a thermal energy storage (TES) subsystem, particularly at high temperatures. This study proposes a novel TS-CAES system with low-melting-point molten salt TES and comparatively analyzes its dynamic characteristics under constant-pressure and sliding-pressure operation modes. The dynamic model has been validated to satisfy the conservation laws. The results indicate that exergy losses under constant-pressure operation mainly occur at the throttle valve, whereas sliding-pressure operation can achieve a round-trip efficiency (RTE) of 78.21%, which is 8.14% higher than that of constant-pressure operation, while energy losses are reduced by 20.77%. In addition, the temperature of the water thermal storage subsystem increases after completing one cycle, necessitating the addition of a cooler between the reheater outlet and the low-temperature water thermal storage tank. This study provides theoretical support for the engineering application of the molten salt-based TS-CAES system.

Suggested Citation

  • Wang, Qianting & Zhang, Cancan & Wu, Yuting, 2026. "Dynamic characteristics comparative simulation of TS-CAES system integrated with low melting point molten salt TES," Energy, Elsevier, vol. 360(C).
    • Handle: RePEc:eee:energy:v:360:y:2026:i:c:s0360544226018852
    DOI: 10.1016/j.energy.2026.141778
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