半导体温差发电模块传热特性的数值研究  

Numerical studies of heat transfer performance of thermoelectric modules

作　　者：时雯[1] 何川[1] 李少华[2] 

机构地区：[1]重庆大学动力工程学院教育部低品位能源利用技术及系统重点实验室,重庆400044 [2]中国能源建设集团安徽省电力设计院,安徽合肥230601

出　　处：《电源技术》2016年第2期329-331,344,共4页Chinese Journal of Power Sources

基　　金：国家科技支撑计划项目(2012BAJ25B06)

摘　　要：针对在光伏-温差混合发电系统中加入温差发电模块能否强化传热、降低光伏电池温度这一问题,结合温差发电的基本原理及传热学理论,采用有限容积法,研究了负载电阻、冷端对流换热系数对温差模块电学特性和传热特性的影响情况。结果表明:随着负载电阻的增加,回路中的电流逐渐减小,电压升高,输出功率会在最佳匹配电阻下达到最大值;负载电阻的增大同时也会导致温差模块传热性能降低,当电阻小于相应温差下对应的临界值时,温差模块会起到强化传热的作用;冷端对流换热系数对系统的传热性能的影响较大,当热端与环境温度之差为150 K,冷端对流换热系数为500 W/(m2·K)时,温差模块的发电效率可达到2.14%,是相同条件下对流换热系数为50 W/(m2·K)的3倍。The heat transfer characteristics of thermoelectric modules were researched. A mathematical model based on thermoelectric principle and heat transfer theory was built and used to solve the temperature distribution of thermoelectric generators. Analysis under different conditions was carried out to evaluate the electrical and thermal performance of the thermoelectric modules. Results show that with the increase of the load resistance,the current in the circuit reduces and the voltage rises. Maximum value under a certain load resistance value was achieve by the output power. However,heat transfer performance of the system could be reduced by the increase of load resistance value. Convection heat transfer coefficient on the cold side had a great impact on heat transfer performance of the whole system. When the temperature difference between hot and cold side reached 150 K,and the convection heat transfer coefficient achieved 500 W/（m2·K）, the power generation efficiency of thermoelectric modules could reach2.14%,and it increased 3 times more than 50 W/（m2·K）.

关 键 词：温差发电 传热特性 负载电阻 对流换热系数 

分 类 号：TM913[电气工程—电力电子与电力传动]