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Design and optimization considerations for thermoelectric devices

机译：热电设备的设计和优化注意事项

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The performance of a real thermoelectric power generation (TEPG) device designed to extract waste heat from the exhaust system of vehicles and to directly convert the recovered exhaust energy into. electricity was studied under various driving conditions using a proposed thermoelectric (TE) model in the current work. The proposed model was formulated from the first law of thermodynamics and Ohm's law and from a control volume that represents the TEPG system such that the temperature-dependent material properties of and the spatial-dependent heat flow through the thermoelement can be taken into account in the TEPG performance calculation. The temperature of the fluids, the temperatures at the top and the bottom of the TE modules, and the output power of the device were firstly calculated for the actual TEPG device using the proposed model in combination with the energy conservation equations for the fluids flowing through the heat exchangers. The results agree well with the experimental measurements and other model predictions. The model was then used to probe the effects of a broad design and operating parameters on the TEPG device performance. The results demonstrated strong inter-dependency of the TE module design, the heat exchanger design, the flow arrangement, the flow rates, and the operating conditions, which need to be considered systematically in TEPG device optimization. Finally, an optimal module fill factor of 0.35 was found for the given TEPG and heat exchanger design, which will generate about average 8.1% more output power under a broad vehicle driving conditions with the material usage less than half of that used by the original module design with a fill factor of 0.7704. (C) 2016 Elsevier Ltd. All rights reserved.
机译：真正的热电发电（TEPG）设备的性能，该设备旨在从车辆的排气系统中提取废热，并将回收的排气能直接转化为热能。在当前工作中，使用拟议的热电（TE）模型研究了各种驱动条件下的电力。所提出的模型是根据热力学第一定律和欧姆定律以及代表TEPG系统的控制量制定的，因此在热电偶中可以考虑热敏元件的温度相关材料特性和空间相关热流。 TEPG性能计算。首先使用建议的模型结合流过的流体的能量守恒方程，为实际的TEPG设备计算出流体的温度，TE模块顶部和底部的温度以及设备的输出功率。热交换器。结果与实验测量和其他模型预测非常吻合。然后，该模型用于探究广泛的设计和操作参数对TEPG设备性能的影响。结果表明，TE模块设计，热交换器设计，流量安排，流量和运行条件之间存在强烈的相互依赖性，这在TEPG设备优化中需要系统地加以考虑。最后，对于给定的TEPG和热交换器设计，发现模块的最佳填充系数为0.35，在较宽的车辆驾驶条件下，其材料使用量将少于原始模块的一半，在这种情况下，该模块的平均输出功率将提高平均约8.1％。设计的填充系数为0.7704。 （C）2016 Elsevier Ltd.保留所有权利。

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