A thermally coupled metal hydride hydrogen storage and fuel cell system |
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| Affiliation: | 1. Department of Mechanical Engineering, Inha University, 100 Inha-ro Nam-Gu, Incheon 402-751, Republic of Korea;2. National Fusion Research Institute, Gwahagno 113, Yuseong-gu, Daejeon 305-333, Republic of Korea;3. Department of Applied Chemistry, Konkuk University, 322 Danwol-Dong, Chungju, Chungbuk 380-701, Republic of Korea;4. Material Engineering and Science, Hongik University, Jochiwon-eup, Yeongi-gun, Chungnam 339-701, Republic of Korea;5. Department of Materials Science and Engineering, Korea National University of Transportation, Chungju 380-702, Republic of Korea;1. HySA Systems Competence Centre, South African Institute for Advanced Materials Chemistry (SAIAMC), University of the Western Cape, Bellville, South Africa;2. University of Split, Faculty of Mechanical Engineering and Naval Architecture, Department of Thermodynamics and Heat Engines, Split, Croatia;3. TF DESIGN (Pty) Ltd., Stellenbosch, South Africa;4. Impala Platinum Ltd, Springs, South Africa;1. HySA Systems Competence Centre, South African Institute for Advanced Materials Chemistry, Faculty of Natural Sciences, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa;2. Department of Chemical and Metallurgical Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa;3. Laboratory of Hydrogen Storage Materials, Institute of Problems of Chemical Physics, Russian Academy of Sciences, Prospect Semenova, 1, Chernogolovka 142432, Russian Federation;1. Graduate Institute of Energy Engineering, National Central University, Jhongli 320, Taiwan, ROC;2. Department of Mechanical Engineering, National Central University, Jhongli 320, Taiwan, ROC |
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| Abstract: | This paper examines the ability of metal hydride storage systems to supply hydrogen to a fuel cell with a time varying demand, when the metal hydride tanks are thermally coupled to the fuel cell. A two-dimensional mathematical model is utilized to compare different heat transfer enhancements and storage tank configurations. The scenario investigated involves two metal hydride tanks containing the alloy Ti0.98Zr0.02V0.43Fe0.09Cr0.05Mn1.5, located in the air exhaust stream of a fuel cell. Three cases are simulated: a base case with no heat transfer enhancements, a case with external fins attached to the outside of the tank, and a case where an annular tank design is used. For the imposed duty cycle, the base case is insufficient to provide the hydrogen demands of the system, while both the finned and annular cases are able to meet the demands. The finned case yields higher pressures and occupies more space, while the annular case yields acceptable pressures and requires less space. Furthermore, the annular metal hydride tank meets the requirements of the fuel cell while providing a more robust and compact hydrogen storage system. |
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