Experimental study and CFD thermal assessment of horizontal hot water storage tank integrating Evacuated Tube Collectors with heat pipes
Experimental study and CFD thermal assessment of horizontal hot water storage tank integrating Evacuated Tube Collectors with heat pipes
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DOI：
10.1016/j.solener.2018.05.062
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发表时间：
2018-08
期刊：
影响因子：
6.7
通讯作者：
S. Fertahi;T. Bouhal;T. Kousksou;A. Jamil;A. Benbassou
中科院分区：
文献类型：
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作者：
S. Fertahi;T. Bouhal;T. Kousksou;A. Jamil;A. Benbassou
本文介绍了一项实验研究和一组应用于储存热水的卧式水箱的 CFD 模拟。因此，这项工作的主要目的是对所研究的卧式水箱提出一种新的优化设计，该水箱被认为是集成真空管集热器（ETC）与热管的个人太阳能热水器的主要装置。进行了一项实验研究，使用热像仪测量热管的最高温度。随后，利用之前记录的实验结果进行CFD模拟。数值研究旨在评估集成在储罐侧面内壳上的热管数量对其能量性能（例如放电效率）的影响。事实上，根据使用的热管数量（n）研究了四种情况。定义了几个性能指标来确定最佳配置，例如热管处评估的传热系数、温度轮廓和流线、根据储罐内部定义的特定路径的温度演变以及排放效率……发现卧式储罐的平均温度随着热管数量的增加而增加。另一方面，流场层流结构受到扰动，热负荷水出口温度也受到影响。另外，n=6时靠近储罐出口的热管的HTC计算结果为212.5W/K·m 2，而n=8和n=10时分别为300W/K·m 2 和230W/K·m 2 。而且，卧式储罐的排放效率主要取决于水温的瞬时变化。
This paper presents an experimental study and a set of CFD simulations applied to a horizontal tank storing hot water. Hence, the main purpose of this work is to suggest a new and optimal design of the studied horizontal tank which is considered as the main device in individual solar water heaters integrating Evacuated Tube Collectors (ETC) with heat pipes. An experimental study was carried out to measure the maximum temperature of the heat pipes using a thermal camera. Subsequently, CFD simulations were performed using the previously recorded experimental results. The numerical studies aimed to assess the effect of the heat pipe’s number, integrated on the lateral internal shell of the tank, on its energetic performances such as the discharging efficiency. In fact, four cases were studied according to the number of the used heat pipes (n). Several performance indicators were defined to identify the optimal configuration, such as the heat transfer coefficient assessed at the heat pipe, temperature contours and streamlines, temperature evolution according to specific paths defined inside the storage tank and the discharging efficiency… It was found that the average temperature of the horizontal tank is increased by the rise in the heat pipe’s number. On the other hand, the laminar structure of the flow field is disturbed and the outlet temperature of the hot loaded water is also affected. Otherwise, the HTC calculated for the heat pipe close to the outlet of the storage tank for n= 6 achieved 212.5 W/K m 2, while it is 300 W/K m 2 and 230 W/K m 2 for n= 8 and n= 10, respectively. Moreover, the discharging efficiency of the horizontal storage tank depends mainly on the instantaneous variation of the water’s temperature.