Modeling of thermal stresses and probability of survival of tubular SOFC |
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| Affiliation: | 1. Laboratory for Industrial Energy Systems (LENI), Faculty of Engineering, Swiss Federal Institute of Technology, 1015 Lausanne, Switzerland;2. Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim N-7491, Norway;3. Department of Engineering Design and Materials, Norwegian University of Science and Technology, Trondheim N-7491, Norway;1. Nigde University, Mechanical Engineering Department, 51245, Nigde, Turkey;2. Abdullah Gul University, Mechanical Engineering Department, 38039, Kayseri, Turkey;3. Meliksah University, Mechanical Engineering Department, 38280, Kayseri, Turkey;4. International Association for Hydrogen Energy, Miami University, Miami, USA;1. Department of Mechanical Engineering-Engineering Mechanics, Michigan Technological University, 1400 Townsend Dr., Houghton, MI 49931, USA;2. Department of Mechanical Engineering, University of New Haven, 300 Boston Post Road, West Haven, CT 06516, USA;1. Department of Energy (DENERG), Politecnico di Torino, Corso Duca Degli Abruzzi, 24, 10129, Turin, Italy;2. Energy Center, Politecnico di Torino, Via Paolo Borsellino, 38/16, 10138, Turin, Italy;1. Equipe TurboMach, Université Mohamed V Agdal, Ecole Mohamadia d''Ingénieurs, Laboratoire de Turbomachines, EMI B.P: 765 Avenue Ibn Sina, Agdal, Rabat, Morocco;2. Laboratoire Magnétisme, Université Mohamed V Agdal, Matériaux Magnétiques, Micro-onde et céramique, Ecole normale supérieure, BP 9235, Ocean, Rabat 1000, Morocco;3. Hassan II Academy of Science and Technology, Rabat, Morocco;4. L2MCS – Laboratoire de Mécanique des Matériaux et Calcul des Structures, ENSET-Rabat, B.P. 6207, Av. Armée Royale, Madinât Al Irfane Rabat, Morocco;1. FUELMAT Group, Institute of Mechanical Engineering, Faculty of Engineering Sciences and Technology, Ecole Polytechnique Fédérale de Lausanne, Station 9, CH-1015 Lausanne, Switzerland;2. Department of Energy Storage and Conversion, Technical University of Denmark, Frederiksborgvej 399, DK-4000 Roskilde, Denmark;3. Topsoe Fuel Cell, Nymoellevej 66, DK-2800 Kgs. Lyngby, Denmark |
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| Abstract: | The temperature profile generated by a thermo-electro-chemical model was used to calculate the thermal stress distribution in a tubular solid oxide fuel cell (SOFC). The solid heat balances were calculated separately for each layer of the MEA (membrane electrode assembly) in order to detect the radial thermal gradients more precisely. It appeared that the electrolyte undergoes high tensile stresses at the ends of the cell in limited areas and that the anode is submitted to moderate tensile stresses. A simplified version of the widely used Weibull analysis was used to calculate the global probability of survival for the assessment of the risks related to both operating points and load changes. The cell at room temperature was considered and revealed as critical. As a general trend, the computed probabilities of survival were too low for the typical requirements for a commercial product. A sensitivity analysis showed a strong influence of the thermal expansion mismatch between the layers of the MEA on the probability of survival. The lack of knowledge on mechanical material properties as well as uncertainties about the phenomena occurring in the cell revealed itself as a limiting parameter for the simulation of thermal stresses. |
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