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Effect of substrate layers on thermo-electric performance under transient heat loads

机译：基材层对瞬态热负荷下热电性能的影响

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摘要

Due to thermal resistance, the temperature difference between the hot and cold sides of thermoelectric elements and power generation in thermoelectric generators are affected by the module's substrate. Moreover, there are various types of applications where thermoelectric generators operate under transient heat load, and other material properties of the substrates, such as heat capacity, have impact on temperature profile of the thermoelectric generator. This paper, therefore, aims to evaluate transient behavior of thermoelectric generator, affected by its geometry, under periodic and oscillated thermal loads in order to provide a link between the power output and power management of thermoelectric generators. A three dimensional COMSOL Multiphysics model of the thermoelectric generator is developed to evaluate performance of the module under transient heat loads, different substrate materials and thicknesses, and various coolant heat transfer coefficients. Results of the simulations, which are in a good agreement with experimental data, show that the rectangular heat load provides highest power generation between the investigated heat loads, and the thermoelectric generator with Kapton substrates produces maximum voltage oscillation amongst the studied substrate layers. The numerical results of this study conclude that, the material properties and thickness of the substrate have significant effect on the thermo-electric behavior under transient heat loads.
机译：由于热阻，热电元件的热和冷侧之间的温度差和热电发电机中的发电受模块基板的影响。此外，存在各种类型的应用，其中热电发电机在瞬态热负荷下操作，以及诸如热容量的基板的其他材料特性对热电发电机的温度曲线产生影响。因此，本文旨在评估热电发电机的瞬态行为，受到其几何形状的周期性和振荡的热载荷，以便在热电发电机的功率输出和电源管理之间提供链路。开发了一种热电发电机的三维COMSOL多体图模型，以评估瞬态热负荷，不同的基板材料和厚度和各种冷却剂传热系数的模块的性能。与实验数据的良好一致性的模拟结果表明，矩形热负荷在研究的热负荷之间提供最高的发电，并且具有Kapton基板的热电发电机在研究中产生最大电压振荡。该研究的数值结果得出结论，基板的材料特性和厚度对瞬态热负荷下的热电行为具有显着影响。

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