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Liu Y.-L.,Zhejiang University | Zhao Y.-Z.,Zhejiang University | Zhao L.,Zhejiang University | Li X.,Zhejiang University | And 7 more authors.
International Journal of Hydrogen Energy | Year: 2010

In this research, experiments were performed to investigate the thermal behaviors such as temperature rise and distributions inside 35 MPa, 150 L hydrogen storage cylinders during its refueling. The main factors affecting the temperature rise in the fast fill process such as the mass filling rate and initial pressure in the cylinder were considered. The experimental results show that the mass filling rate is a constant when the ratio of the pressure in the tank to the cylinder is higher than 1.7, and the mass filling rate decreases when the ratio is lower than 1.7; the temperature inside the cylinder increases nonlinearly in the filling process and the maximum value of temperature rise at the interface of the cylinder exists in the caudal region; the temperature rise reaches a larger value with a lower initial pressure in the cylinder or a higher mass filling rate. Furthermore, the limit of mass filling rate in the case of different ambient temperature was obtained. © 2009 Professor T. Nejat Veziroglu.

Zheng J.,Zhejiang University | Chen H.,Zhejiang University | Xu P.,Zhejiang University | Zhao Y.,Zhejiang University | And 2 more authors.
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP | Year: 2010

The design of high pressure pipeline is one of key technical problems facing the realization of hydrogen refueling stations and fuel cell automobiles. Currently, hydrogen velocity restrictions in pipeline are considered in reference to natural gas, which leads to some difficulties in design of pipelines for hydrogen supply systems. Considering the different characteristics of hydrogen, this paper establishes an analytical model and carries out a series of experimental tests to investigate the flow characteristics of hydrogen in pipelines. The effects of the pressure in the pipeline on the hydrogen flow velocity and mass flow are studied, and the corresponding relationships are also obtained. The results may provide references for the design of hydrogen pipelines and the development of standards in hydrogen refueling stations and hydrogen supply systems. Copyright © 2009 by ASME.

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