摘要
为了解决温差发电技术中发电片热端与尾气间传热温差大造成的输出功率和热电转化效率不高的问题,本文提出通过改变尾气与温差发电片热端之间的传热结构,且在结构中充以气液相变工质的方法强化传热,并通过数值模拟的方法比较了加装相变结构前后温差发电器性能的变化。在此基础上,研究了尾气温度、流量及相变换热温差发电器的结构参数对其输出功率及效率的影响规律。结果表明,特定尺寸的相变结构可大幅提高发电器的输出功率及转化效率,但其优化效果受工质蒸发温度的限制。
In order to solve the problem of low power output and conversion efficiency caused by the great heat loss between the hot side of the thermoelectric generator and exhaust, this paper proposed a thermoelectric generator which has a big endothermic area and a small exothermic area, and using phase change to enhance heat transfer. By using Fortran computer programming, this paper established a mathematical model using automobile exhaust as heat source and calculated the performance of the thermoelectric generator. The results showed the structure of specific size can greatly improve the output power and conversion efficiency of the generator, but the more the exhaust temperature and the flow, the weaker the optimization effect.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第7期1515-1519,共5页
Journal of Engineering Thermophysics
基金
国家973计划资助项(No.2011CB707203)
关键词
温差发电
强化换热
相变
输出功率
优化设计
thermoelectric generation
heat transfer enhancement
phase change
power outputoptimization design
