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A novel exergy analysis method for cerium-based solar thermochemical cycles

Author

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  • Long, Yibiao
  • Jiao, Fan
  • Yang, Shiying
  • Weng, Yixin
  • Liu, Qibin

Abstract

Ce-based thermochemical cycles are characterized by high stability and adaptability to operating temperatures. But few studies have been conducted in terms of exergy prospect. In this study, we propose an exergy analysis model and identify its irreversibility distribution. Through introducing an Energy Level-Enthalpy Change (A-∆H) diagram, we capture this distribution and reveal the trend of irreversibility variation. The results show that irreversibility occurs mainly in heat exchangers and reduction reactors and is influenced by temperature and pressure. Previous studies have focused only on the operating parameters, but this has led to negligible improvement in efficiency, hence the need for a comprehensive analysis using sound mathematical methods. We improve the exergy efficiency by 177% through theoretically optimizing the operating conditions and detail the reasons for the reduction in exergy losses. This study provides theoretical guidance and analytical tools for experiments.

Suggested Citation

  • Long, Yibiao & Jiao, Fan & Yang, Shiying & Weng, Yixin & Liu, Qibin, 2024. "A novel exergy analysis method for cerium-based solar thermochemical cycles," Applied Energy, Elsevier, vol. 373(C).
    • Handle: RePEc:eee:appene:v:373:y:2024:i:c:s0306261924012583
    DOI: 10.1016/j.apenergy.2024.123875
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    References listed on IDEAS

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    1. Lange, M. & Roeb, M. & Sattler, C. & Pitz-Paal, R., 2014. "T–S diagram efficiency analysis of two-step thermochemical cycles for solar water splitting under various process conditions," Energy, Elsevier, vol. 67(C), pages 298-308.
    2. Kong, Hui & Hao, Yong & Jin, Hongguang, 2018. "Isothermal versus two-temperature solar thermochemical fuel synthesis: A comparative study," Applied Energy, Elsevier, vol. 228(C), pages 301-308.
    3. Jin, Hongguang & Ishida, Masaru, 1993. "Graphical exergy analysis of complex cycles," Energy, Elsevier, vol. 18(6), pages 615-625.
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