热电元侧棱设计对热电器件性能影响  

Influence of Side Design of Thermoelement on Performance of Thermoelectric Generator

作　　者：周亚杰 吴子华[1,2] 谢华清 王元元[1,2] ZHOU Yajie;WU Zihua;XIE Huaqing;WANG Yuanyuan(School of Energy and Materials,Shanghai Polytechnic University,Shanghai 201209,China;Shanghai Engineering Research Center of Advanced Thermal Functional Materials,Shanghai 201209,China)

机构地区：[1]上海第二工业大学能源与材料学院,上海201209 [2]上海先进热功能材料工程技术研究中心,上海201209

出　　处：《上海第二工业大学学报》2022年第2期135-141,共7页Journal of Shanghai Polytechnic University

基　　金：国家自然科学基金面上项目(51876111,52176081);上海市自然科学基金(21ZR1424500);科委地方能力建设(22010500700);上海市曙光项目(18SG54)资助。

摘　　要：热电发电器件(thermoelectric generators,TEGs)具有体积小、质量轻、无传动部件、无污染、可靠性高等优点。然而,目前TEGs的输出功率仍然较低。利用有限元方法研究了不同侧棱设计热电元对TEGs的输出功率和转换效率的影响。并进一步研究不同侧棱设计的台状和倒台状热电元对TEGs输出功率和转换效率的影响。结果表明,柱状热电元的热电器件的输出功率高于梯台状热电元热电器件的输出功率,但其转换效率却低于后者,这是因为热量在梯台状热电元内部进行横向传导,导致热量损失。热电元棱数增加后,热电器件的输出功率有所提高,这是因为热电元的棱数增加会降低热量横向传导所引起的损失。而这棱数增加提升热电器件输出功率的现象在热电元下上底面积差异较大时更明显。Thermoelectric generators(TEGs)have the advantages of small size,light weight,no transmission parts,no pollution,and high reliability.However,the output power of TEGs is still low.The finite element method was used to study the effects of thermoelectric elements with different side designs on the output power and conversion efficiency of TEGs.Furthermore,the effects of terrace-shaped and inverted-table thermoelectric elements with different side designs on the output power and conversion efficiency of TEGs were further studied.The results show that the output power of the thermoelectric device of the columnar thermoelectric element is higher than that of the terraced thermoelectric element,but its conversion efficiency is lower than that of the latter,because the heat is conducted laterally inside the terraced thermoelectric element,resulting in heat loss.When the number of edges of the thermoelectric element increases,the output power of the TEGs increases,because the increase of the number of edges of the thermoelectric element reduces the loss caused by the lateral conduction of heat.The phenomenon of increasing the number of edges to improve the output power of the TEGs is more obvious when the difference between the upper and lower areas of the thermoelectric element is large.

关 键 词：热电发电器件 热电元侧棱设计 输出功率 转换效率 

分 类 号：TM913[电气工程—电力电子与电力传动]