基于改进贪心算法的温差电器件电-热耦合效应研究

Study on Electro-thermal Coupling Effect of Thermoelectric Devices Based on Improved Greedy Algorithm

温差电器件实际工作时由于内电阻的存在不可避免地会产生焦耳热,传统的温差电研究中虽注意到温差发电过程中的焦耳热现象,但只是在等效计算热功率时消去焦耳热部分,而忽略了焦耳热对温差电器件热、冷端温度分布的影响。针对传统研究的不足,考虑实际应用中的电-热耦合效应,运用理论推导的方法建立了第三类边界条件下的温差发电负载模型,并利用改进贪心算法迭代求解,最后以SP1848-21745型温差发电片为例,通过试验验证了模型与算法的正确性。模型的数值求解与发电片实测结果对比表明,考虑了电-热耦合效应的温差发电负载模型的热电输出值更接近实测值。

Joule heat will be inevitably produced when thermoelectric devices work because of internal resistance,the traditional researches about thermoelectric power generation have noticed this phenomenon in the thermoelectric generation process,and Joule heat part is removed only when equivalent thermal power is calculated,however the influence of Joule heat on the temperature at the hot and cold ends of thermoelectric devices is neglected.In view of the shortcomings of the traditional researches,a load model of thermoelectric generation under the third-boundary conditions was established with the method of theoretical derivation considering electro-thermal coupling effect in practical application,and the model was solve by improved greedy algorithm.Finally,the model and algorithm were validated by experiment with the example of SP1848-21745 thermoelectric power generation tablet.The comparison between numerical results of the model and experimental results shows that the thermoelectric output value of the thermoelectric generation load model considering the electro-thermal coupling effect is closer to the measured value.