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Research on ionic liquid circulation method based on high-pressure common rail concept for ionic liquid hydrogen compressors and its impact on compressor energy efficiency

Author

Listed:
  • Zhou, Hao
  • Ooi, Kim Tiow
  • Sun, Haoran
  • Fei, Liangyu
  • Dong, Peng
  • Liu, Boyang
  • Zhao, Shengdun

Abstract

Ionic liquid hydrogen compressors are promising for hydrogen refueling stations due to their high energy efficiency and low maintenance. However, the ionic liquid circulation system remains a critical challenge, as the large pressure differential between the gas-liquid separator outlet (≈90 MPa) and low-pressure compression chamber (≈1 MPa) introduces safety risks and energy losses with conventional depressurization-repressurization methods. This study proposes a novel ionic liquid circulation system based on the high-pressure common rail concept, directly utilizing high-pressure ionic liquid from the separator as the driving source for spray replenishment. A CFD model coupling the Volume of Fluid (VOF) method and Discrete Phase Model (DPM) is developed to investigate two-phase flow behavior and heat transfer characteristics during compression with spray injection cooling, validated against experimental data with maximum deviation of 1.9%.

Suggested Citation

  • Zhou, Hao & Ooi, Kim Tiow & Sun, Haoran & Fei, Liangyu & Dong, Peng & Liu, Boyang & Zhao, Shengdun, 2026. "Research on ionic liquid circulation method based on high-pressure common rail concept for ionic liquid hydrogen compressors and its impact on compressor energy efficiency," Energy, Elsevier, vol. 352(C).
    • Handle: RePEc:eee:energy:v:352:y:2026:i:c:s0360544226010546
    DOI: 10.1016/j.energy.2026.140949
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