摘要
针对小型半导体温差(TEG)发电器中接触热阻和接触电阻的影响进行了分析研究.结果表明,接触热阻和接触电阻只在2mm以内的电偶臂长度内有明显影响;在电偶臂长度小于1mm时,输出功率和热电效率均有一个急剧上升的变化阶段;当长度超过5mm后,输出功率和热电效率均趋于定值;在冷热端温度分别为283和383K,Z=0.0024K-1、电偶臂长为2mm、接触热阻比0.2和接触电阻比0.1条件下,热电功率约为4mW/mm2,热电效率约为3.5%,而理想无接触热阻和电阻的热电效率约为4.2%.由此可知,半导体温差发电器中接触热阻和接触电阻的影响不可忽视.
The influence of the thermal contact resistance and electric contact resistance of a small thermoelectrical power generator （TEG） is analyzed. Results show that the thermal contact resistance and electrical contact resistance have a noticeable influence on the thermoelectric power generator when the thermal couple length is less than 2mm. The power reaches 4mW/mm^2 , and the efficiency reaches 3.5% when Tc =283K, Th =383K,Z=0. 0024K^-1 ,lc =2mm,r=0.2,and n=0.1. The maximum thermoelectric efficiency is 4.2% without thermal contact resistance or electrical contact resistance. Furthermore, the power output and efficiency increase strongly when the thermal couple length is less than 2mm,but the power output tends to decrease to a constant and the efficiency tends to increase to a constant when the thermal couple length is more than 5mm. It is shown that the influence of thermal contact resistance and electrical contact resistance of the thermoelectric power generator cannot be neglected.
关键词
半导体温差发电器
接触效应
输出功率
热电效率
thermoelectric power generator
contact effect
power output
thermoelectrical efficiency
