Revisiting the temperature dependence in material properties and performance of thermoelectric materials
Revisiting the temperature dependence in material properties and performance of thermoelectric materials
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DOI：
10.1016/j.energy.2017.02.020
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发表时间：
2017-04
期刊：
影响因子：
9
通讯作者：
Chengjian Ju;Guansuo Dui;H. H. Zheng-H.;Libiao Xin
中科院分区：
文献类型：
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作者：
Chengjian Ju;Guansuo Dui;H. H. Zheng-H.;Libiao Xin
热电材料在不久的将来能源生产和利用中发挥着重要作用。然而，温度依赖的材料特性，包括热导率，电阻率和塞贝克系数使理论分析具有挑战性。在这项工作中，我们提出了一个近似的解析解，其中我们估计的电阻率和汤姆逊系数的分布线性，但电阻率和汤姆逊系数的分布仍然是非线性的。从我们的近似解析模型得到的温度分布与数值预测吻合得很好。更重要的是，对热流密度分布和效率有很大影响的温度导数也与数值结果吻合得很好。然后将该模型应用于热电元件的性能分析。我们发现，导热系数是热电材料的性能，包括效率的关键因素。
Thermoelectric materials play a significant role in energy production and utilization for the near future. However, the temperature-dependent material properties including thermal conductivity, electric resistivity and Seebeck coefficient make the theoretical analysis challenging. In this work, we propose an approximate analytical solution, in which we evaluate the distribution of the electric resistivity and Thomson coefficient linearly, but the distribution of electric resistivity and Thomson coefficient are still nonlinear. The temperature profile obtained from our approximate analytical model agrees well with numerical prediction. More importantly, the derivative of temperature, which has great influence on the heat flux distribution and efficiency, also agrees well with the numerical results. Then the model is applied to analyze the performance of a thermoelectric element. We show that thermal conductivity is critical factor in the performance of thermoelectric materials including the efficiency.