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Research on the matching modes between the thermal storage methods and working fluid types of the thermally integrated Carnot battery system

Author

Listed:
  • Xia, Xiaoxia
  • Sun, Chuansheng
  • Li, Jiajia
  • Liu, Xinxin
  • Zhang, Xingyu
  • Gong, Siyu
  • Yang, Chengwu
  • Wang, Zhiqi

Abstract

The thermally integrated Carnot battery system is recognized as a promising energy storage technology. Firstly, four matching modes between the thermal storage methods and working fluid types of the thermally integrated Carnot battery system are proposed, which correspond to four systems, namely sensible heat + pure working fluid system, sensible heat + mixed working fluid system, latent heat + pure working fluid system, and latent heat + mixed working fluid system. Then, parametric analysis of four proposed systems is conducted under different heat source and cold source temperatures. Next, the comparison of the thermodynamic performance and economic performance of the four systems is performed. Finally, comprehensive performance of the four systems is evaluated and the mapping of the optimal matching mode under different heat source and cold source temperatures is provided. The findings show that the round-trip efficiency, exergy efficiency and levelized cost of storage of sensible heat + mixed working fluid system are optimal under all operating conditions with the best values of 106.7 %, 51.3 %, and 0.3 $/kWh, respectively. The energy storage density of the latent heat + mixed working fluid system is the optimal under all operating conditions with a maximum of 13.15 kWh/m3. When the heat source temperature is high and the cold source temperature is low, the optimal matching mode is found to be the combination of latent heat storage and mixed working fluid. When the heat source temperature is low and the cold source temperature is high, the optimal matching mode is determined to be the combination of sensible heat storage and mixed working fluid.

Suggested Citation

  • Xia, Xiaoxia & Sun, Chuansheng & Li, Jiajia & Liu, Xinxin & Zhang, Xingyu & Gong, Siyu & Yang, Chengwu & Wang, Zhiqi, 2025. "Research on the matching modes between the thermal storage methods and working fluid types of the thermally integrated Carnot battery system," Energy, Elsevier, vol. 339(C).
    • Handle: RePEc:eee:energy:v:339:y:2025:i:c:s0360544225046171
    DOI: 10.1016/j.energy.2025.138975
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    References listed on IDEAS

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