接触压力对温差发电系统性能的影响

基于自行搭建的温差发电系统性能测试平台,以温度、开路电压、内阻、最大输出功率作为性能参数,研究接触压力对温差发电系统性能的影响规律.研究结果表明:在温差发电系统冷、热端温度均相同的情况下,接触压力增大,则系统开路电压和最大输出功率增大,但增大的幅度随压力的增大而逐渐减小;在温度一定的情况下,接触压力的大小对温差发电片内部的接触电阻影响不大;接触压力对温差发电系统冷、热端温度的瞬态响应特性影响不大,但对系统开路电压的瞬态响应特性影响很大,接触压力增大,则开路电压的瞬态响应速率加快.研究结果证明接触压力对温差发电系统的性能具有显著的影响.

Influence of Contact Pressure on the Performance of Thermoelectric Generator

In this study,an experimental thermoelectric generator test platform was constructed. The experiments were carried out to examine the influences of contact pressure on thermoelectric generator. Temperature,open circuit voltage,resistance and maximum power output were characterized as a function of generator performance. Through-out the experiments,it can be seen that when the hot side and cold side temperatures of thermoelectric generator are homogeneons,the open circuit voltage and maximum power output increase with the increase of pressure,but their increase rates get smaller. Furthermore,at a certain temperature,the internal contact resistance of thermoelectric generator seems insensitive to contact pressure. Finally,the transient response characteristics of hot side and cold side temperatures seem insensitive to contact pressure,while the transient response rate of open circuit voltage accelerates with increasing pressure. It is proved that contact pressure has great effect on the performance of thermoelectric gen-erator.