Design and analysis of SOFC stack with different types of external manifolds |
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| Affiliation: | 1. Department of Mechanical Engineering, Hannam University, 70 Hannam-ro, Daedeok-gu, Daejeon, 34430, Republic of Korea;2. Korea Institute of Energy Research (KIER), 152, Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea;3. Korea Institute of Nuclear Safety (KINS), 62 Gwahak-ro, Yuseong-gu, Daejeon, 34142, Republic of Korea;4. Department of Safety Engineering, Incheon National University, 119 Academy-ro, Yeonsu-gu, Incheon, 22012, Republic of Korea;1. Department of Energy Conversion and Storage, Technical University of Denmark, Kgs. Lyngby, Denmark;2. FOSS, Hilleroed, Denmark;3. SINTEF, Oslo, Norway;4. Aalborg University, Aalborg, Denmark;1. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, South Korea;2. Department of Mechanical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, South Korea;3. Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, South Korea;1. Department of Vehicle Engineering, Lee Ming Institute of Technology Taipei, Taiwan;2. Department of Mechanical Engineering, Lee Ming Institute of Technology Taipei, Taiwan;1. School of Energy and Power, Jiangsu University of Science and Technology, 212003, Zhenjiang, Jiangsu, China;2. School of Mechanical and Engineering, Jiangsu University of Science and Technology, 212003, Zhenjiang, Jiangsu, China |
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| Abstract: | In this study, a four-cell stack of anode-supported planar solid oxide fuel cells (SOFCs) was designed and simulated to investigate the flow/heat transport phenomena and the performance of the SOFC stack. This SOFC stack was designed based on the external manifold types with one side open toward the cathode inlet and components such as base station, manifold, end plate, press jig, and housing. To investigate the performance of the SOFC stack, a step-by-step heat and flow analysis was conducted. First, the separator, functioning as a current collector and a gas channel, was designed to have repeated convex shapes. As the boundary of the flow passage was periodic in both streamwise and transverse directions, only a small part of the flow channel was simulated. In the case of simple homogeneous porous media, the computational results for flow resistance could be expressed by following Darcy's Law. Subsequently, these calculation results from the separator flow analysis were used in the housing and stack analysis. Second, the flow of the cathode region in the housing of SOFC stack was analyzed to verify the flow uniformity in the cathode channel of the separators. Finally, a stack analysis was executed using the electrochemical reaction model to investigate the performance and transport phenomena of the stack. Owing to the uniformity in flow and temperature, each SOFC cell exhibited similar contours of reactant gases, temperature, and current density. In the case of two different fuel utilizations with different flow rates, the low fuel utilization performed slightly better than the high fuel utilization. |
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| Keywords: | SOFC Flow and heat analysis External manifold Fuel utilization Performance evaluation |
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