3D model of thermoelectric generator (TEG) case study: Effect of flow regime on the TEG performance
3D model of thermoelectric generator (TEG) case study: Effect of flow regime on the TEG performance
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DOI：
10.1016/j.enconman.2018.10.104
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发表时间：
2019-01-15
影响因子：
10.4
通讯作者：
Hassan, Hamdy
中科院分区：
文献类型：
--
作者：
Eldesoukey, Ayman;Hassan, Hamdy
本文采用CFD建模方法对热电发电机（TEGs）的三维模型进行了研究。提出了热电耦合的TEG模块物理模型的求解方法。利用ANSYS-Fluent软件的三维（3D）数值解和用户自定义函数（UDF）进行求解。然后，利用三维模型研究了流动形式对安装在烟囱壁上的TEG性能的影响。此外，还研究了烟囱内外热流气体的入口流速和冷却空气的入口流速对TEG换热和输出功率的影响。结果表明，与以往模型计算结果相比，本文模型计算结果与实验结果吻合较好。当TEG安装在入口位置，然后是热流气体和冷却空气的湍流位置时，TEG模块的最大输出功率得到。在不增加冷却气流速度的情况下增加热气体入口速度或反之，对TEG输出功率影响不大。在进入烟囱的总流速相同的情况下，TEG冷侧的传热比热侧的传热对TEG输出功率的影响更有效。为了使TEG模块只覆盖部分烟囱壁，并使TEG输出功率最大化，建议将可用的TEG模块安装在烟囱入口位置的烟囱壁和烟囱内外湍流区位置。
In this study, an investigation of a new three-dimensional model of thermoelectric generators (TEGs) by using CFD modeling is performed. A solution is presented for the physical model of the TEG module which couples the thermal and electrical models. The solution is carried out by using three-dimensional (3D) numerical solution and User defined function (UDF) of the ANSYS-Fluent software. Then, the 3D model is utilized to study the impact of flow regimes on the performance of the TEG mounted on a chimney wall. Also, the impact of the inlet flow velocity of the hot flow gasses and coolant air inside and outside the chimney, respectively on the heat transfer and output power of the TEG is studied. The results show that the present 3D model results agree well with the experimental results compared to the previous models' results. The maximum output power from the TEG modules is obtained when the TEG is installed at the inlet position followed by the turbulent positions of the hot flow gases and cooling air. Increasing the inlet velocity of the hot gases without increasing cooling air velocity or vice versa hasn't great effect on the TEG output power. The heat transfer of the cold side of the TEG is more effective on the TEG output power compared to that of the hot side at the same total flow velocity entering the chimney. To cover only a part of the chimney walls by the TEG modules, and maximize the TEG output power, it is recommended to install the available TEG modules at the chimney wall at the inlet position of the chimney and at the position of the turbulent flow regions inside and outside the chimney.