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<p>A new high-precision hydrogen corresponding states principle (HCSP) equation has been proposed to accurately describe the real gas properties of on-board ultra-high pressure hydrogen storage systems. Traditional models exhibit deviations due to neglecting intermolecular interactions and a lack of explicit molecular theoretical explanations. This study proposes a new approach to derive the equation of state based on molecular association theory, accounting for the effects of temperature on molecular volume and intermolecular forces. Experiments carried out at 70 MPa and 298.15 K with HCSP predictions and experimental values showed a density deviation of only 0.0987 %. In hydrogen fuel vehicles, the HCSP equation produced mean absolute percentage deviations (MAPD) of 0.8166 %, 0.8665 %, and 0.3376 % under low-temperature precooling, normal driving, and fire hazard conditions, respectively. Therefore, this equation provides a precise method for predicting hydrogen properties in ultra-high-pressure storage systems.</p>

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Novel corresponding states principle equation for real hydrogen under ultra-high pressure considering molecular association

  • 期刊论文

  • 发表日期：

    2025年10月30日

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  • Ruiyao Tao,
  • Yaobao Yin,
  • Xiaoxue Liu,
  • Xinyi Wang,
  • Huiyun Xu,
  • Hailong Xue,
  • Yuqi Han

摘要

A new high-precision hydrogen corresponding states principle (HCSP) equation has been proposed to accurately describe the real gas properties of on-board ultra-high pressure hydrogen storage systems. Traditional models exhibit deviations due to neglecting intermolecular interactions and a lack of explicit molecular theoretical explanations. This study proposes a new approach to derive the equation of state based on molecular association theory, accounting for the effects of temperature on molecular volume and intermolecular forces. Experiments carried out at 70 MPa and 298.15 K with HCSP predictions and experimental values showed a density deviation of only 0.0987 %. In hydrogen fuel vehicles, the HCSP equation produced mean absolute percentage deviations (MAPD) of 0.8166 %, 0.8665 %, and 0.3376 % under low-temperature precooling, normal driving, and fire hazard conditions, respectively. Therefore, this equation provides a precise method for predicting hydrogen properties in ultra-high-pressure storage systems.