Thermal analysis of a heat pipe solar central receiver for concentrated solar power tower
Thermal analysis of a heat pipe solar central receiver for concentrated solar power tower
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DOI：
10.1016/j.applthermaleng.2016.04.043
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发表时间：
2016-06
影响因子：
6.4
通讯作者：
Z. Liao;A. Faghri
中科院分区：
文献类型：
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作者：
Z. Liao;A. Faghri
介绍了一种用于熔盐太阳能发电塔的新型热管太阳能中央接收器。基本元件由反射器、热管和接收管组成。反射器将来自定日镜场的集中的太阳光重定向到热管的蒸发器部分上。在吸收辐射热能之后，热管内的工作流体在蒸发器部分处蒸发，并且流到热管的冷凝器部分，在那里工作流体冷凝。冷凝器部分插入接收器管中，并且由接收器管内的传热流体的交叉流冷却。在所提出的概念中，接收管不受阳光的直接照射，因此可以通过电加热保持温暖。这将延长接收器的日常操作时间，并大大减少熔融盐可能的冻结。在这项研究中，腔接收器的几何形状和边界条件相同的熔盐电实验（MSEE）腔接收器的开发。对腔式接收器的基本元件进行了数值模拟。获得了88.5%的效率，这略高于MSEE。此外，还研究了不同通流次数和不同吸收表面热流密度下的吸收器效率。结果表明，接收机效率可高达91.5%。
A novel heat pipe solar central receiver for a molten salt solar power tower is presented. The basic element consists of a reflector, heat pipe, and receiver tube. The reflector redirects concentrated sunlight from the heliostats field onto the evaporator section of the heat pipe. After absorbing the radiative heat energy, the working fluid inside the heat pipe is vaporized at the evaporator section, and flows to the condenser section of the heat pipe where it condenses. The condenser section is inserted into the receiver tube, and is cooled by a cross flow of the heat transfer fluid inside the receiver tube. In the proposed concept, the receiver tube is free from direct irradiation by the sunlight and therefore can be kept warm by electrical heating. This will extend the daily operating time of the receiver and greatly reduce possible freezing of the molten salt. In this study, a cavity receiver with the same geometry and boundary conditions as the Molten Salt Electrical Experiment (MSEE) cavity receiver was developed. Numerical simulation for the basic element of the cavity receiver was conducted. An 88.5% efficiency was obtained, which is slightly higher than the MSEE. Moreover, the receiver efficiency under a different number of flow passes and various heat flux density on the absorbing surface was also studied. Results show that the receiver efficiency can be as high as 91.5%.