Comparative study of the influences of different water tank shapes on thermal energy storage capacity and thermal stratification
Comparative study of the influences of different water tank shapes on thermal energy storage capacity and thermal stratification
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DOI：
10.1016/j.renene.2015.06.016
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发表时间：
2016
期刊：
影响因子：
8.7
通讯作者：
Zhengou Yang;Haisheng Chen;Liang Wang;Yong Sheng;Wang Yifei
中科院分区：
文献类型：
--
作者：
Zhengou Yang;Haisheng Chen;Liang Wang;Yong Sheng;Wang Yifei
在层流自然对流条件下，研究了不同水箱形状对静态运行方式下储能能力和热分层的影响。建立了一套新的实验装置，建立了模拟水箱内流动与换热的数值模型。计算结果与实验数据吻合较好。在所研究的10种不同水箱形式中，球形水箱和桶形水箱的储热能力最理想，而圆柱形水箱的储能效果最差。储热能力与水箱表面积密切相关。根据速度场和温度场的特点，这些形状可以分为三类：尖角形状、半球形形状和水平平面形状。尖角的形状具有最高的热分层程度，而水平面表面的形状具有最低的热分层程度。带有半球的形状的温度介于这两个度之间。不同形状的热分层由水箱底部的流动和流体向环境的换热决定。
The influences of different water tank shapes on thermal energy storage capacity and thermal stratification in the static mode of operation is investigated in this study under laminar natural convection. A new experimental apparatus is built, and a numerical model is developed to simulate the flow and heat transfer in the water tank. Computational results agree with the experimental data. Among the 10 different water tank shapes studied, the sphere and barrel water tanks are ideal for thermal energy storage capacity, whereas the cylinder water tank is the least favorable. The thermal energy storage capacity is closely related to the surface area of the water tank. According to the characteristics of the velocity and temperature fields, these shapes can be divided into three categories: shapes with sharp corners, those with hemispheres, and those with horizontal plane surface. Shapes with sharp corners have the highest degree of thermal stratification, whereas the shapes with horizontal plane surface possess the lowest. That of the shapes with hemispheres lies in between these two degrees. The thermal stratification of different shapes is determined by the flow at the bottom of the water tank and the heat transfer from the fluid to the environment.