Numerical simulation of the hydrogen storage with reaction heat recovery using metal hydride in the totalized hydrogen energy utilization system |
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Authors: | Tetsuhiko Maeda Keiichi NishidaManabu Tange Toru TakahashiAkihiro Nakano Hiroshi ItoYasuo Hasegawa Masao MasudaYoshiaki Kawakami |
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Affiliation: | a National Institute of Advanced Industrial Science and Technology, Energy Technology Research Institute, 1-2-1 Namiki, Tsukuba East, Tsukuba, Ibaraki 305-8564, Japan b Tokyo Institute of Technology, 4259 Nagatsuta, Midori-Ku, Yokohama 226-8503, Japan c Department of Mechanical Engineering, Shibaura Institute of Technology, Toyosu, Koto, Tokyo 158-8563, Japan d Takasago Thermal Engineering Co., Ltd., Research and Development center, 3150 Iiyama Atsugi City, Kanagawa 243-0213, Japan |
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Abstract: | Numerical simulation of a hydrogen storage tank of a Totalized Hydrogen Energy Utilization System (THEUS) for application to commercial buildings was done to verify the practicality of THEUS. THEUS consists of a fuel cell, water electrolyzer, hydrogen storage tank and their auxiliary machinery. The hydrogen storage tanks with metal hydrides for load leveling have been previously experimentally investigated as an important element of THEUS. A hydrogen storage tank with 50 kg AB5 type metal hydride was assembled to investigate the hydrogen-absorbing/desorbing process, which is exothermic/endothermic process. The goal of this tank is to recover the cold heat of the endothermic process for air conditioning, and thus improve the efficiency of THEUS. To verify the practical effectiveness of this improved system, we developed a numerical simulation code of hydrogen storage tank with metal hydride. The code was validated by comparing its results with experimental results. In this code the specific heat value of the upper and lower flanges of the hydrogen storage tank was adjusted to be equal to the thermal capacity of the entire tank. The simulation results reproduce well the experimental results. |
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Keywords: | Hydrogen energy system Hydrogen storage Metal hydride Reaction heat recovery Simulation model |
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