Development of graphite foam infiltrated with MgCl2 for a latent heat based thermal energy storage (LHTES) system |
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| Affiliation: | 1. Energy Systems Division Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA;2. Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 West Taylor Street (m/c 251), Chicago, IL 60607, USA;1. Centre for Energy Sciences, Department of Mechanical Engineering, Faculty of Engineering, 50603 Kuala Lumpur University of Malaya, Malaysia;2. Mechanical Engineering Department, Collage of Engineering, King Saud University, 11421 Riyadh, Saudi Arabia;3. Dept. of Mechanical Engineering, Dhaka University of Engineering and Technology, Gazipur, 1700, Bangladesh;1. School of Mechanical and Energy Engineering, Tongji University, China;2. Green Energy and Environment Research Laboratories, Industrial Technology Research Institute, Taiwan;3. Key Laboratory of Gas Hydrate, Guangzhou Institute of Energy Conversion, China Academy of Sciences, China;1. Huadian Electric Power Research Institute, Hangzhou, Zhejiang 310030, China;2. Department of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China;3. Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;1. Ocean Engineering and Technology Research Center, Iranian National Institute for Oceanography and Atmospheric Science, Tehran, Iran;2. Griffith School of Engineering, Gold Coast Campus, Griffith University, QLD, 4222, Australia |
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| Abstract: | Thermal energy storage (TES) systems that are compatible with high temperature power cycles for concentrating solar power (CSP) require high temperature media for transporting and storing thermal energy. To that end, TES systems have been proposed based on the latent heat of fusion of the phase change materials (PCMs). However, PCMs have relatively low thermal conductivities. In this paper, use of high-thermal-conductivity graphite foam infiltrated with a PCM (MgCl2) has been investigated as a potential TES system. Graphite foams with two porosities were infiltrated with MgCl2. The infiltrated composites were evaluated for density, heat of fusion, melting/freezing temperatures, and thermal diffusivities. Estimated thermal conductivities of MgCl2/graphite foam composites were significantly higher than those of MgCl2 alone over the measured temperature range. Furthermore, heat of fusion, melting/freezing temperatures, and densities showed comparable values to those of pure MgCl2. Results of this study indicate that MgCl2/graphite foam composites show promise as storage media for a latent heat thermal energy storage system for CSP applications. |
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| Keywords: | Latent heat thermal energy storage Concentrated solar power Phase change material Graphite foam Infiltration Magnesium chloride |
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