Heat transfer enhancement in triplex-tube latent thermal energy storage system with selected arrangements of fins

2017 3rd International Conference on Environmental Science and Material Application

生态环境科学;材料科学

Zhao, Liang^1 ; Xing, Yuming^1 ; Liu, Xin^1 ; Rui, Zhoufeng^1

School of Aeronautic Science and Engineering, Beihang University, Beijing

100191, China^1

关键词: Discharging process;    Heat Transfer enhancement;    Latent thermal energy storages;    Reduce energy consumption;    Solidification process;    Thermal energy storage systems;    Tube heat exchangers;    Two dimensional numerical models;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/108/5/052018/pdf
DOI  :  10.1088/1755-1315/108/5/052018

来源: IOP

【 摘 要 】

The use of thermal energy storage systems can effectively reduce energy consumption and improve the system performance. One of the promising ways for thermal energy storage system is application of phase change materials (PCMs). In this study, a two-dimensional numerical model is presented to investigate the heat transfer enhancement during the melting/solidification process in a triplex tube heat exchanger (TTHX) by using fluent software. The thermal conduction and natural convection are all taken into account in the simulation of the melting/solidification process. As the volume fraction of fin is kept to be a constant, the influence of proposed fin arrangement on temporal profile of liquid fraction over the melting process is studied and reported. By rotating the unit with different angle, the simulation shows that the melting time varies a little, which means that the installation error can be reduced by the selected fin arrangement. The proposed fin arrangement also can effectively reduce time of the solidification of the PCM by investigating the solidification process. To summarize, this work presents a shape optimization for the improvement of the thermal energy storage system by considering both thermal energy charging and discharging process.