Numerical simulation study on the heat transfer characteristics of the tube receiver of the solar thermal power tower
Numerical simulation study on the heat transfer characteristics of the tube receiver of the solar thermal power tower
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DOI：
10.1016/j.apenergy.2011.07.006
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发表时间：
2012-02
期刊：
影响因子：
11.2
通讯作者：
Xiaoping Yang;Xiao-xi Yang;J. Ding;Y. Shao;H. Fan
中科院分区：
文献类型：
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作者：
Xiaoping Yang;Xiao-xi Yang;J. Ding;Y. Shao;H. Fan
在太阳能热电塔系统中，熔盐管接收器是一个重要部件。然而，管子的流动性能与其他管子不同，管子圆周的一半是用不同的热流密度加热的，另一半是隔热的。由于熔盐性质随温度的变化而变化，合金管壁的温度分布、热流密度分布及换热特性非常复杂。本研究使用计算流体力学来揭示这些现象。结果表明，无论是轴向还是径向，熔盐和管壁的温度分布都很不均匀，管壁温度是防止熔盐分解的重要参数。受热面的热流密度随速度的增加而增加，绝热表面的热流密度则相反。与Sieder-Tate方程相比，换热系数更高。局部Nu数的值几乎不随周向余弦角的变化而变化。
In a solar thermal power tower system, a molten salt tube receiver is a significant component. However, the tube flow performance is different with other tubes, half the circumference of the tube is heated with a different heat flux and half that circumference is insulated. As the properties of molten salt change with the temperature along the alloy tube wall, the distributions of temperature and heat flux and the heat transfer characteristics are very complex. The present study uses the computational fluid dynamics to reveal these phenomena. The results show that the temperature distribution of molten salt and tube wall are very uneven whether in an axial or radial direction, and the temperature of the inner tube wall is an important parameter for preventing the decomposition of molten salt. The heat flux of the heating surface increases with the increase of velocity; however, the situation is just the opposite for the adiabatic surface. The heat transfer coefficient is higher as compared with the Sieder–Tate equation. The value of the local Nu number is almost unchanged with the change of the cosine angle over all circumferential direction.