Thermodynamic analysis and optimization of an integrated solar thermochemical hydrogen production system |
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Affiliation: | 1. Department of Chemical and Biological Engineering, University of Colorado at Boulder, Boulder, CO 80303, USA;2. Corporate Research and Innovation Center (CRI) at KAUST, Saudi Basic Industries Corporation (SABIC), Thuwal, Saudi Arabia;1. Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario, L1H 7K4, Canada;2. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, 240 Prince Phillip Drive St. John''s, Newfoundland and Labrador, A1B 3X5, Canada;1. Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, Ontario, L1H 7K4, Canada;2. Division of Sustainable Development, College of Science and Engineering, Hamad Bin Khalifa University (HBKU), Doha, Qatar |
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Abstract: | In this study, thermodynamic analysis of solar-based hydrogen production via copper-chlorine (Cu–Cl) thermochemical water splitting cycle is presented. The integrated system utilizes air as the heat transfer fluid of a cavity-pressurized solar power tower to supply heat to the Cu–Cl cycle reactors and heat exchangers. To achieve continuous operation of the system, phase change material based on eutectic fluoride salt is used as the thermal energy storage medium. A heat recovery system is also proposed to use the potential waste heat of the Cu–Cl cycle to produce electricity and steam. The system components are investigated thoroughly and system hotspots, exergy destructions and overall system performance are evaluated. The effects of varying major input parameters on the overall system performance are also investigated. For the baseline, the integrated system produces 343.01 kg/h of hydrogen, 41.68 MW of electricity and 11.39 kg/s of steam. Overall system energy and exergy efficiencies are 45.07% and 49.04%, respectively. Using Genetic Algorithm (GA), an optimization is performed to evaluate the maximum amount of produced hydrogen. The optimization results show that by selecting appropriate input parameters, hydrogen production rate of 491.26 kg/h is achieved. |
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Keywords: | Hydrogen production Thermochemical cycles Solar energy Exergy analysis Multigeneration system Optimization |
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