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Efficiency analysis of ocean compressed air energy storage system under constant volume air storage conditions

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  • Cui, Kunpeng
  • Wang, Chenyu
  • Liu, Zhenfei
  • Fu, Deran
  • Chen, Guo
  • Li, Wen
  • Nie, Lei
  • Shen, Yijun
  • Xu, Yonghong
  • Kuang, Rao

Abstract

The proposed technical solution, which integrates compressed air energy storage systems with marine renewable energy sources, promises to provide stable power to offshore users. In this paper, a method of direct compression of air using wave mechanical energy under constant capacity storage conditions is presented. Based on the analysis of the damping characteristics of the compressor, a control strategy that adapts to the wave conditions and pressure variations by varying the number of compressors working is simultaneously proposed to maintain a reasonable difference between the driving force and the damping force of the compressor group and to obtain more active output. The proposed scheme achieves a maximum Capture Width Ratio (CWR) of 27 % and a maximum wave-to-compressed air energy conversion efficiency of 15.6 %. To further enhance expansion efficiency, the system's overall energy efficiency is analyzed under various potential marine reheating conditions. The results indicate that by primarily utilizing wave energy, supplemented with a small amount of power from other marine renewable sources and surface seawater thermal energy, the system can attain a generation efficiency of 10.6 %. Moreover, the analysis of damping characteristics and system energy efficiency highlights potential pathways for further improving the system's performance.

Suggested Citation

  • Cui, Kunpeng & Wang, Chenyu & Liu, Zhenfei & Fu, Deran & Chen, Guo & Li, Wen & Nie, Lei & Shen, Yijun & Xu, Yonghong & Kuang, Rao, 2025. "Efficiency analysis of ocean compressed air energy storage system under constant volume air storage conditions," Energy, Elsevier, vol. 329(C).
    • Handle: RePEc:eee:energy:v:329:y:2025:i:c:s0360544225021735
    DOI: 10.1016/j.energy.2025.136531
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