The hydrogen valve used in this study is intended to be applied to a automobile, and since there is a limit to the length of the stem, it is necessary to review the optimized stem, and for this, it is required to investigate the heat transfer characteristics of the hydrogen shut-off valve. For this, the temperature of the entire shut-off valve and especially the plunger and O-ring, which are key components in the solenoid valve driving the hydrogen shut-off valve, was calculated using the ANSYS-CFX flow analysis program. From the analysis results, the length of the stem capable of maintaining the design temperature of -40℃ or higher should be at least 139 mm, and it is judged that it should be 140 mm or more considering safety. When determining the stem length of the hydrogen blocking valve for automobiles, constraints on installation in automobiles should be considered.

Abstract
1. 서 론
2. 유동 해석
    2.1 지배방정식과 열전달 해석모 델
    2.2 열전달 해석모 델의 형상과 격자 생성
    2.3 해석변수와 해석조건
3. 유동해석 결과 및 고찰
    3.1 차단밸브 전체에 대한 유동 및 열전달 특성
    3.2 솔레노이드 밸브 내부의 열전달 특성
4. 결 론
References

• 김나용(Graduate School, Gyeongsang National University) | Na-Yong Kim
• 김문학(developing hydrogen system components, Unick) | Mun-Hak Kim
• 이치우(Department of Future Automotive Engineering, Gyeongsang National University) | Chi-Woo Lee Corresponding author