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Performance prediction of a coupled metal hydride based thermal energy storage system
Affiliation:1. Department of Mechanical Engineering, India;2. Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore, 560012, India;1. Savannah River National Laboratory, Aiken, SC, 29808, USA;2. Greenway Energy LLC, Aiken, SC, 29803, USA;1. Department of Mechanical Engineering, Indian Institute of Technology, Guwahati, Assam, India;2. Centre for Energy, Indian Institute of Technology, Guwahati, Assam, India;3. Department of Mechanical Engineering, Wichita State University, USA;1. Department of Mechanical Engineering, Indian Institute of Science, Bangalore, India;2. Interdisciplinary Centre for Energy Research, Indian Institute of Science, Bangalore, India;1. Department of Imaging and Applied Physics, Fuels and Energy Technology Institute, Curtin University, GPO Box U1987, Perth, WA 6845, Australia;2. Interdisciplinary Nanoscience Center (iNANO) & Institut for Kemi, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark;1. College of Engineering, Mechanical Engineering Department, King Khalid University, Abha, Saudi Arabia;2. Laboratory of Thermal and Energetic Systems Studies (LESTE) at the National School of Engineering of Monastir, University of Monastir, Tunisia;3. School for Engineering of Matter, Transport & Energy, Arizona State University, Tempe, AZ, United States
Abstract:The present study discusses the thermodynamic compatibility criteria for the selection of metal hydride pairs for the application in coupled metal hydride based thermal energy storage systems. These are closed systems comprising of two metal hydride beds – a primary bed for energy storage and a secondary bed for hydrogen storage. The performance of a coupled system is analyzed considering Mg2Ni material for energy storage and LaNi5 material for hydrogen storage. A 3-D model is developed and simulated using COMSOL Multiphysics® at charging and discharging temperatures of 300 °C and 230 °C, respectively. The LaNi5 bed used for hydrogen storage is operated close to ambient temperature of 25 °C. The results of the first three consecutive cycles are presented. The thermal storage system achieved a volumetric energy storage density of 156 kWh m−3 at energy storage efficiency of 89.4% during third cycle.
Keywords:Thermal energy storage  Metal hydride  Numerical modeling  Reaction kinetics  Energy storage density
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