中文摘要：

热电发电系统效率除了与热电材料物性相关之外,提高热电器件两端温差也是提升转换效率的重要途径。因而,提高冷端的换热能力,降低冷端温度是提高热电发电系统效率的重要途径。纳米流体作为一种新型换热介质,能够显著地改善液体工质的传热性能,具有均匀、稳定、导热系数高等特点。本文研究了水冷却和纳米流体冷却两种情况下热电发电系统输出特性,发现纳米流体冷却大幅提高了系统的输出功率和转换效率,并研究了流速对热电发电系统输出特性的影响。

英文摘要：

The efficiency of the system depends on the temperature difference between the hot and the cold sides of the thermoelectric modules（TEM） In addition to on the thermoelectric materials property.Therefore,improve the heat transfer effect of cold side,reduce the cold side temperature of TEM is an important approach to enhance the efficiency of the thermoelectric generation systems.As a new type of heat transfer medium nanofluids can strengthen the heat transfer performance of working liquid significantly.It has the advantages of uniform,stable and high thermal conductivity,etc.This paper studies the performance of TEM system by the coolant of water and nanofluid The results show that the output power and conversion efficiency of TEM system increase greatly by nanofluid coolant At the same time,the output performance change by difference velocity is investigated.