作　　者： ; ; ;

机构地区： 电子科技大学物理电子学院

出　　处： 《电源技术》 2010年第5期493-495,共3页

摘　　要： 利用商用有限元软件ANSYS建立了带接触层的分段温差电单偶模型,不仅能考虑接触电阻,还能考虑接触热阻。该模型由n-Bi2Te3/n-PbTe,p-BiSbTe/p-Zn4Sb3组成。在电偶臂总长l=5mm时,优化温差电元件得到最大热电转换效率,并分析接触电阻和接触热阻对热电转换效率的影响,以及电臂的分界面温度。结果表明,在热端温度673K,冷端温度分别为298、323、353K时,最大转换效率为11.64%,10.70%,9.50%。当接触层厚0.1mm,接触电阻率为5×10-5Ω·m(即每电臂接触电阻为150μΩ·cm2),接触热导率为kc=6W/mK时,最大转换效率降到10.15%,9.33%,8.31%。分界面温度在材料Z-T曲线交点温度附近,大约为3%～-1%范围内。 The model of segmented thermoelectric unicouple （STU） with contact layers composing of n-Bi2Te3/n-PbTe and p-BiSbTe/p-Zn4Sb3 was built by commercial FEM software ANSYS. The maximizing thermoelectric conversion efficiency was obtained when the total length of unicouples was 5 mm, and the effect of contact and thermal resistance and interfacial temperature on thermoelectric conversion efficiency was analyzed. The results show that when the temperature of the hot side is 673 K and the temperature of cold side is 298, 323 K, and 353 K, the peak thermoelectric conversion efficiency is 11.64%,10.70%,and 9.50%, respectively. When the thickness of contact layer is 0.1 mm, the contact electrical resistance increases to 5×10-5 Ω·m, and the thermal contact conductivity is 6 W/mK, the peak efficiency decreases to 10.15%,9.33%,and 8.31%. The interfacial temperatures are around the intersections of the Z-T curves, varying from ＋3% to-1%.

关 键 词： 分段温差电单偶 热电转换效率 热电仿真

领　　域： [电气工程]