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<p>The heat flow characteristics inside the check valve were analyzed by the Joule-Thomson effect according to the hydrogen temperature entering the check valve in the FCEV charging system, the differential pressure between the inlet and outlet, and the change of the geometry of the internal operating part of the check valve; the temperature rise rate in the discharge area was analyzed based on this. Based on the SAE J2601 hydrogen charging protocol, hydrogen inlet temperature (Tin) 233 K, 298 K, 363 K, and differential pressure (ΔP) 30 MPa, 20 MPa, and 10 MPa were selected, and round (R = 0.25 mm, 0.5 mm) and diameter (D = 3 mm, 3.5 mm) were changed for the diverter flow path geometry inside the operating part. In addition, a grid dependency test was performed to analyze the impact of the grid setting conditions applied to the analysis on the results; the reliability of the numerical analysis results was ensured with less than 3 % impact of the grid shape on the results. The Soave-Redlich-Kwong equation of state (SRK EOS) was applied to calculate the physical properties of both pure components and mixtures. This has the advantage of comprehensively representing physical properties such as boiling point, polarity, and molecular weight of pure components, and numerically representing the behavior and differences between real and ideal gases.</p><p>The results of the study show that the internal maximum velocity (V) increased by about 31.6% compared to the basic geometry condition by changing to the R = 0.5 mm geometry under the condition of 30MPa differential pressure (ΔP) and 363 K inlet temperature (Tin) of the check valve. In addition, for the basic geometry condition with a constant hydrogen inlet temperature (Tin) of 233 K and a differential pressure (ΔP) of 20 MPa, the Joule-Thomson coefficient (μ_JT) increased by 3.2 % and the maximum temperature (Tmax) increased by 3 % compared to the differential pressure (ΔP) of 30 MPa condition, confirming the temperature increase in all simulation conditions due to the Joule-Thomson effect. In particular, increasing differential pressure is strongly influenced by the Joule-Thomson effect, resulting in a high rate of rising temperature. This study can be used to predict the temperature rise due to optimizing the check valve geometry for FCEV charging and to study hydrogen pre-cooling and temperature change to ensure system stability under various conditions.</p>

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Study of the rate of increase of the outlet temperature of the check valve for FCEV with consideration of the Joule-Thomson effect

  • 期刊论文

  • 发表日期：

    2025年4月3日

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  • Seung Hun Oh,
  • Hyun Kyu Suh

摘要

The heat flow characteristics inside the check valve were analyzed by the Joule-Thomson effect according to the hydrogen temperature entering the check valve in the FCEV charging system, the differential pressure between the inlet and outlet, and the change of the geometry of the internal operating part of the check valve; the temperature rise rate in the discharge area was analyzed based on this. Based on the SAE J2601 hydrogen charging protocol, hydrogen inlet temperature (Tin) 233 K, 298 K, 363 K, and differential pressure (ΔP) 30 MPa, 20 MPa, and 10 MPa were selected, and round (R = 0.25 mm, 0.5 mm) and diameter (D = 3 mm, 3.5 mm) were changed for the diverter flow path geometry inside the operating part. In addition, a grid dependency test was performed to analyze the impact of the grid setting conditions applied to the analysis on the results; the reliability of the numerical analysis results was ensured with less than 3 % impact of the grid shape on the results. The Soave-Redlich-Kwong equation of state (SRK EOS) was applied to calculate the physical properties of both pure components and mixtures. This has the advantage of comprehensively representing physical properties such as boiling point, polarity, and molecular weight of pure components, and numerically representing the behavior and differences between real and ideal gases.

The results of the study show that the internal maximum velocity (V) increased by about 31.6% compared to the basic geometry condition by changing to the R = 0.5 mm geometry under the condition of 30MPa differential pressure (ΔP) and 363 K inlet temperature (Tin) of the check valve. In addition, for the basic geometry condition with a constant hydrogen inlet temperature (Tin) of 233 K and a differential pressure (ΔP) of 20 MPa, the Joule-Thomson coefficient (μ_JT) increased by 3.2 % and the maximum temperature (Tmax) increased by 3 % compared to the differential pressure (ΔP) of 30 MPa condition, confirming the temperature increase in all simulation conditions due to the Joule-Thomson effect. In particular, increasing differential pressure is strongly influenced by the Joule-Thomson effect, resulting in a high rate of rising temperature. This study can be used to predict the temperature rise due to optimizing the check valve geometry for FCEV charging and to study hydrogen pre-cooling and temperature change to ensure system stability under various conditions.