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Operating mode of Brayton-cycle-based pumped thermal electricity storage system: Constant compression ratio or constant rotational speed?

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  • Zhang, Han
  • Wang, Liang
  • Lin, Xipeng
  • Chen, Haisheng

Abstract

Pumped thermal electricity storage (PTES) is a thermomechanical energy storage technology that offers the advantages of geographical independence, high energy density, and low-cost. It has attracted considerable interest from scholars at home and abroad. At present, research on the thermo-economic performance of this technology is relatively in-depth. However, there remains a lack of research on its operational control strategy, which is crucial for technological industrialisation. This study innovatively proposes two operation modes for compressors and expanders operating at a constant rotational speed (CRS): the CRS-CMF and CRS-VMF modes. The performances under the proposed modes were comprehensively compared with that under the traditional constant compression ratio (CCR) operation mode, and optimisation was performed. The results revealed that the proposed CRS operation mode significantly improved the system storage performance compared to that under the CCR mode. Under the design conditions, the highest round-trip efficiency of 64.67% can be obtained in the CRS-VMF mode. Better output stability was obtained under the CRS-CMF mode, and the delivery power offset ratio reduced from over 50% under the CCR mode to a minimum of 19.13%. When air was used as the working medium, the loss was relatively high; however, better output stability was obtained. Sensitivity analysis showed that a larger charging/discharging duration and upper temperature could achieve better energy storage performance. This research can provide a theoretical basis for formulating appropriate system control schemes and further optimising operational control strategies.

Suggested Citation

  • Zhang, Han & Wang, Liang & Lin, Xipeng & Chen, Haisheng, 2023. "Operating mode of Brayton-cycle-based pumped thermal electricity storage system: Constant compression ratio or constant rotational speed?," Applied Energy, Elsevier, vol. 343(C).
    • Handle: RePEc:eee:appene:v:343:y:2023:i:c:s0306261923004713
    DOI: 10.1016/j.apenergy.2023.121107
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    References listed on IDEAS

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