Energy demand has greatly increased today and phase change storage technology is rapidly growing due to its renewable nature. This study explores a new Triple Tube Heat Exchanger (TTHX) model, which divides phase change materials (PCMs) into two regions to improve the connection between TTHX and PCM, to improve the thermal conductivity of PCMs with different fins' number, arrangement, and angle, consequently enhancing thermal storage efficiency. A more efficient exchanger is developed by using Molten Salt as PCM and adding TiO and AlO nanoparticles with different concentrations. Liquid fraction, temperature, and velocity obtained from numerical simulation are employed to characterize thermal storage efficiency. ANSYS 2022R1 is used for pre-modeling and numerical computations. The simulation results are turned into graphs and charts for PowerPoint and Origin analysis. We find that PCM's heat transfer efficiency is increased by 34.3 % when effective fins are added, and the addition of 5%TiO further increases it by 8.73 %. With the addition of AlO and its concentration variation, combined with the effective fins, the heat transfer efficiency of the PCM can be enhanced by 40.73 %.

中文翻译：

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具有叶形翅片的新型三重管中纳米粒子熔盐的熔化性能


如今能源需求大大增加，相变存储技术由于其可再生性而迅速发展。本研究探索了一种新的三管换热器（TTHX）模型，该模型将相变材料（PCM）分为两个区域，以改善TTHX和PCM之间的连接，以提高具有不同翅片数量、排列方式和温度的PCM的导热系数。角度，从而提高蓄热效率。通过使用熔盐作为相变材料并添加不同浓度的 TiO 和 Al2O 纳米颗粒，开发了一种更高效的交换器。利用数值模拟获得的液体分数、温度和速度来表征蓄热效率。 ANSYS 2022R1用于预建模和数值计算。模拟结果转化为图形和图表，用于 PowerPoint 和 Origin 分析。我们发现，当添加有效翅片时，PCM的传热效率提高了34.3％，并且添加5％TiO进一步提高了8.73％。随着Al2O的添加及其浓度变化，结合有效翅片，PCM的传热效率可提高40.73%。