相变传热在半导体热电转换中的应用  

Application of phase change in thermoelectric generator

作　　者：王世学[1] 张星[1] 

机构地区：[1]天津大学中低温热能高效利用教育部重点实验室,天津300072

出　　处：《热科学与技术》2015年第2期119-124,共6页Journal of Thermal Science and Technology

基　　金：国家973计划资助项目(2011CB707203)

摘　　要：为了解决温差发电技术中发电片热端与尾气间热损失大造成输出功率和热电转化效率不高的问题,提出在尾气与温差发电片热端加装相变传热结构,并计算了加装相变结构后发电器的输出功率和效率,同时与相同传热面积时无相变传热情况进行了对比,并模拟了蒸发段管数和冷凝段高度对发电器输出功率及效率的影响。结果表明,相变结构可提高发电器的输出功率及转化效率,且输出功率随冷凝段长度增加出现峰值,蒸发段管数越多,峰值对应的冷凝段长度越长,而发电效率则随冷凝段长度增加而减少;蒸发段管数增加,输出功率和发电效率均增大。In order to solve the low power output and efficiency between the hot side of the thermoelectric generation and gas,this study developed to install a phase change structure between the hot side of the thermoelectric generation and gas,and calculated the power and efficiency of the generation with phase change structure,and investigated the performance curves of this structure design.The results show that the phase change structure can achieve higher power and efficiency. With an increase in the condenser height,the power output reaches a maximum while efficiency is decreasing.Both the power output and the efficiency increase when the section of evaporation increases.

关 键 词：温差发电 相变 传热系数 输出功率 优化设计 

分 类 号：TK514[动力工程及工程热物理—热能工程]