Thermodynamic modeling and exergy analysis of proton exchange membrane fuel cell power system |
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| Affiliation: | 1. Key Laboratory of Hydraulic Machinery Transients (Wuhan University), Ministry of Education, Wuhan, Hubei Province, China;2. Shenzhen Research Institute, Wuhan University, Shenzhen, Guangdong Province, China;3. School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei Province, China;4. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong Province, China;1. Fuel Cell Research Center, Korea Institute of Energy Research, Daejoen 305-343, Republic of Korea;2. Advance Energy Technology, Korea University of Science and Technology, Daejoen 305-350, Republic of Korea;1. Dept. of Climate Change Energy Engineering Yonsei University, Seoul, 03722, South Korea;2. Blue Economy Strategy Institute Co. Ltd., Focus Buld., 23-13, Hyoryeong-ro, 60-gil, Seocho-gu, Seoul, 06721, South Korea;3. Dept. of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, South Korea;4. Fuel Cell Research Center, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, South Korea;5. Mechanical Engineering Dept., Chung-Ang University, Seoul, 06974, South Korea;1. Department of Mechanical Engineering, Pardis Branch, Islamic Azad University, Pardis New City, Iran;2. School of New Technologies, Iran University of Science & Technology, Iran;3. Sustainable & Renewable Energy Engineering Department, University of Sharjah, United Arab Emirates;4. São Paulo State University, UNESP, FEG, Energy Department, United Arab Emirates;1. School of Earth Science and Engineering, Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing, 210098, China;2. Henan Institute of Geological Survey, Zhengzhou, 450001, China;3. Islamic Azad University, Karaj Branch, Iran |
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| Abstract: | The proton exchange membrane (PEM) fuel cell (PEMFC) is equipped with a series of auxiliary components which consume considerable amount of energy. It is necessary to investigate the design and operation of the PEMFC power system for better system performance. In this study, a typical PEMFC power system is developed, and a thermodynamic model of the system is established. Simulation is carried out, and the power distribution of each auxiliary component in the system, the net power and power efficiency of the system are obtained. This power system uses cooling water for preheating inlet gases, and its energy-saving effect is also verified by the simulation. On this basis, the exergy analysis is applied on the system, and the indexes of the system exergy loss, exergy efficiency and ecological function are proposed to evaluate the system performance. The results show that fuel cell stack and heat exchanger are the two components that cause the most exergy loss. Furthermore, the system performance under various stack inlet temperatures and current densities is also analyzed. It is found that the net power, energy efficiency and exergy efficiency of the system reach the maximum when the stack inlet temperature is about 348.15 K. The ecological function is maintained at a high level when the stack inlet temperature is around 338.15 K. Lower current density increases the system ecological function and the power and exergy efficiencies, and also helps decrease the system exergy loss, but it decreases the system net power. |
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| Keywords: | Proton exchange membrane fuel cell Power system Thermodynamic model Exergy analysis Ecological function |
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