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Numerical and Experimental Study of a Thermal Energy Storage System Based on Accelerating the Melting of a Phase Change Material by Using an Auxiliary Fluid

Khademi, Alireza | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53489 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Darbandi, Masoud; Shafii, Mohammad Behshad
  7. Abstract:
  8. The study of heat transfer using solid-liquid phase shifting has attracted much attention in applied engineering fields such as latent heat energy storage, building walls, waste energy recovery, battery thermal management, and more. Over the past few decades, the literature on phase shift has grown tremendously in terms of theory, laboratory, and numerical studies. Melting of phase change materials in rectangular chambers due to its wide range of engineering applications in fields such as casting, metallurgy, heat energy storage, and heat exchangers used in buildings, as well as aerospace issues including the use of These systems have been the subject of numerous studies on space missions to provide energy used in satellites or spacecraft. Many past activities have focused on techniques to increase the thermal conductivity of phasing materials such as nanoparticles, peripheral fins, or heat flux. However, in this study, the energy required to increase heat exchange came from an auxiliary fluid capable of easy access. This study aims to optimize an energy storage system to improve the amount of energy stored and reduce the duration of energy storage. In this regard, experimental experiments and numerical simulations have been used to investigate the effect of the process of melting the solid phase change material in the presence of auxiliary interface fluid and its effect on changing the common boundary of the two materials and the amount of energy stored during the process and time, required to be evaluated. In this study, oleic acid was used as the phase change agent and water as the interface fluid. Fluent software has been used for numerical simulation. In the present study, an attempt is made to optimize the energy storage system with experimental experiments and numerical simulations, which has improved in terms of cost and achievement conditions compared to previous research. Due to the higher density of the auxiliary fluid than the phase change material, during the melting process, this density difference causes the two materials to move, and the buoyant and gravitational forces will improve the speed of the melting process. With the lowest possible cost and time, the amount of energy storage in the phase change material also used increases. The processing time for the volume ratio of 50% OA – 50% water is about 21 minutes, with an average of 0.322 kJ/min of energy stored in the system. This is almost twice the average energy stored in a system using a volume ratio of 100% oleic acid. The system was then numerically examined for different volume ratios to determine the optimal volume ratio in terms of the amount of energy stored in oleic acid
  9. Keywords:
  10. Phase Change Material (PCMs) ; Energy Storage System ; Multiphase Flow ; Melting ; Auxiliary Fluid ; Numerical Simulation

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