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Effect of the Position and the Area of the Vent on the Hydrogen Dispersion in a Naturally Ventilated Cubiod Space with One Vent on the Side Wall


The design of ventilation system has implications for the safety of life and property, and the development of regulations and standards in the space with the hydrogen storage equipment. The impact of both the position and the area of a single vent on the dispersion of hydrogen in a cuboid space (with dimensions L x W x H ¼ 2.90 0.74 1.22 m) is investigated with Computational Fluid Dynamics (CFD) in this study. Nine positions of the vent were compared for the leakage taking place at the floor to understand the gas dispersion. It was shown a cloud of 1% mole fraction has been formed near the ceiling of the space in less than 40 s for different positions of the vent, which can activate hydrogen sensors. The models show that the hydrogen is removed more effectively when the vent is closer to the leakage position in the horizontal direction. The study demonstrates that the vent height of 1.00 m is safer for the particular scenario considered. The area of the vent has little effect on the hydrogen concentration for all vent positions when the area of the vent is less than 0.045 m2 and the height of the vent is less than 0.61 m.

Funding source: This research was funded by Beijing Municipal Natural Sci- ence Foundation (3212002), National Key Research and Development Program of China (2018YFE0105300,2019YFE0101900) and National Natural Sci- ence Foundation of China (51605010).
Related subjects: Safety

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