Numerical analysis of latent heat thermal energy storage using encapsulated phase change material for solar thermal power plant |
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| Affiliation: | 1. School of Resource and Environmental Engineering, Anhui University, Hefei 230601, China;2. CAS Key Laboratory of Urban Pollutant Conversion, Department of Chemistry, University of Science & Technology of China, Hefei, 230026, China;1. University School of Chemical Technology, GGS IP University, Delhi, India;2. Department of Chemical Engineering, IIT, Delhi, India;1. Molecular Biochemistry Laboratory, Materials and Surface Science Institute, Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland;2. Department of Chemical Engineering, SSN College of Engineering, Kalavakkam, Tamilnadu, India;1. Department of Mechanical Engineering, University of la Rioja, Edificio Departamental, C/Luis de Ulloa, 4, 26004 Logroño, La Rioja, Spain;2. Department of Electrical Engineering, University of la Rioja, Edificio Departamental, C/Luis de Ulloa, 4, 26004 Logroño, La Rioja, Spain;1. Chemical Process and Energy Resources Institute, Centre for Research and Technology Hellas, Thermi-Thessaloniki, Greece;2. Department of Automation Engineering, Alexander Technological Educational Institute of Thessaloniki, Thessaloniki, Greece;3. Aristotle University of Thessaloniki, Department of Mechanical Engineering, Thessaloniki, Greece;4. Newcastle University, School of Electrical and Electronic Engineering, Newcastle Upon Tyne, UK |
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| Abstract: | Thermal energy storage improves the load stability and efficiency of solar thermal power plants by reducing fluctuations and intermittency inherent to solar radiation. This paper presents a numerical study on the transient response of packed bed latent heat thermal energy storage system in removing fluctuations in the heat transfer fluid (HTF) temperature during the charging and discharging period. The packed bed consisting of spherical shaped encapsulated phase change materials (PCMs) is integrated in an organic Rankine cycle-based solar thermal power plant for electricity generation. A comprehensive numerical model is developed using flow equations for HTF and two-temperature non-equilibrium energy equation for heat transfer, coupled with enthalpy method to account for phase change in PCM. Systematic parametric studies are performed to understand the effect of mass flow rate, inlet charging system, storage system dimension and encapsulation of the shell diameter on the dynamic behaviour of the storage system. The overall effectiveness and transient temperature difference in HTF temperature in a cycle are computed for different geometrical and operational parameters to evaluate the system performance. It is found that the ability of the latent heat thermal energy storage system to store and release energy is significantly improved by increasing mass flow rate and inlet charging temperature. The transient variation in the HTF temperature can be effectively reduced by decreasing porosity. |
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| Keywords: | Phase change material Encapsulation Organic rankine cycle (ORC)-based solar thermal power plant Temperature fluctuations |
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