Shandong Science ›› 2025, Vol. 38 ›› Issue (5): 79-92.doi: 10.3976/j.issn.1002-4026.20240105

• Energy and Power • Previous Articles     Next Articles

Study of thermodynamic properties of transcritical carbon dioxide energy storage system

JIANG Jiahui1(), ZHANG Xuelin2, LI Shuangjiang3, XUE Xiaodai2, CHEN Wei1, ZHANG Bin1,*()   

  1. 1. College of Electromechanical Engineering,Qingdao University of Science & Technology,Qingdao 266061,China
    2. Department of Electrical Engineering and Applied Electronics,Tsinghua University,Beijing 100084,China
    3. Power China Hebei Electric Power Engineering Co.,Ltd.,Shijiazhuang 050032,China
  • Received:2024-09-02 Revised:2024-11-11 Published:2025-10-20 Online:2025-10-11

Abstract:

Carbon dioxide energy storage (CCES),which has evolved from compressed air energy storage,offers advantages such as zero carbon emissions,high energy storage density,safety and reliability. To further utilize the advantages of easy liquefaction and the high energy density of carbon dioxide,a transcritical carbon dioxide energy storage system (TC-CCES) with gas-liquid two-phase changes was proposed. The low-pressure storage tank in the system contains a gas-liquid mixture that remains in transcritical state throughout the operation. Energy and exergy analyses were conducted on TC-CCES,and simulations were performed to obtain the dynamic properties of the system during its operation. In addition,the impact of the initial temperature of the high-pressure gas storage tank on the system was analyzed. The study revealed that lowering the initial temperature of the high-pressure tank enhanced the system efficiency. When the system ran in a stable state,it achieved an efficiency of 56.93% and an energy storage density is 3 510 kJ/m3.

Key words: transcritical carbon dioxide energy storage, gas-liquid two-phase, energy conservation, exergic balance, dynamic properties

CLC Number: 

  • TK02