汽车尾气温差发电系统热电模块优化仿真分析

Optimization and Analysis of Thermoelectric Module for Vehicle Exhaust Generator

针对汽车尾气中热量的大量散失,造成能源的极大浪费问题,采用温差发电技术,利用Seebeck效应将汽车尾气中的低品位余热转换为电能。通过Solidworks完成对汽车尾气温差发电系统的三维建模与装配和热电单电偶的结构优化与建模,建立输出功率和转换效率与阻值比和面长比的理论数学模型,MatLab仿真计算得出当内外负载相等时输出功率取得最大值。同时,为了提高温差发电系统的输出功率,在相同工况下,ANSYS分析热电单电偶模型的温度场和温差电势场,得出优化后的3种热电单电偶其Seebeck电动势比Π型结构的Seebeck电动势分别提高了5%,10%和25%。

Aiming at the problem of heat waste in vehicle exhaust emission,by means of thermoelectric generation technology,the low-grade waste heat from vehicle exhaust is converted to electrical energy by Seebeck effect.Using Solidworks to creat the model including assembly drawing and thermocouple.Create a mathematical model for power generation efficiency.By MatLab calculation the maximum condition of power is obtained,while the external resistance is equal to the load resistance.In order to improve the output power,simulated the temperature field and potential field of a thermocouple under the same working conditions,the results showed that the output power of optimized model is higher thanΠmodel,respectively 5%,10%and 25%.