IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v335y2025ics0360544225037880.html
   My bibliography  Save this article

Performance analysis of a novel liquid carbon dioxide energy storage system improved by the ejector and the solar energy for combined heat and power

Author

Listed:
  • Zheng, Lixing
  • Wang, Jialu
  • Xu, Chao
  • Xue, Xiaojun
  • Yan, Laiqing
  • Li, Zichao

Abstract

Liquid carbon dioxide energy storage (LCES) is considered a promising energy storage technology due to its high energy density and low environmental impact. However, additional pumps or throttling valves are required during the energy release process, leading to additional energy consumption and loss. This paper proposes a novel LCES system improved by an ejector and solar thermal collector for sustainable power and heat supply, and improve the efficiency of LCES system by avoiding part of throttling loss. The thermodynamic model of the novel system is established and the simulation is carried out. The gas dynamic function method was used to calculate and design the geometry of ejector and the reliability and accuracy were verified using a CFD simulation. In addition, the performance of the novel system was evaluated by energy, exergy and economic analysis. The results showed that the optimal entrainment ratio of the ejector for the novel LCES system is 0.17; and the round-trip efficiency is 68.94 %, which is an improvement of 10.15 %, compared with the conventional LCES system. The energy storage density is 17.86 kWh/m3, and the exergy efficiency is 81.26 %. The total investment of novel system is 6643.59 k$ with a dynamic payback period of 4.76 years and a net present value of 7382.44 k$. In addition, In addition, the effects of variations in some of the main parameters on the performance of the system are investigated. This paper may provide a feasible solution for the performance enhancement of LCES system.

Suggested Citation

  • Zheng, Lixing & Wang, Jialu & Xu, Chao & Xue, Xiaojun & Yan, Laiqing & Li, Zichao, 2025. "Performance analysis of a novel liquid carbon dioxide energy storage system improved by the ejector and the solar energy for combined heat and power," Energy, Elsevier, vol. 335(C).
    • Handle: RePEc:eee:energy:v:335:y:2025:i:c:s0360544225037880
    DOI: 10.1016/j.energy.2025.138146
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544225037880
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2025.138146?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to

    for a different version of it.

    More about this item

    Keywords

    ;
    ;
    ;
    ;

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:energy:v:335:y:2025:i:c:s0360544225037880. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    We have no bibliographic references for this item. You can help adding them by using this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.