Comparison and parameter optimization of a two-stage thermoelectric generator using high temperature exhaust of internal combustion engine
Comparison and parameter optimization of a two-stage thermoelectric generator using high temperature exhaust of internal combustion engine
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DOI：
10.1016/j.apenergy.2014.05.048
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发表时间：
2014-10
期刊：
影响因子：
11.2
通讯作者：
Xingyu Liang;Xiuxiu Sun;H. Tian;G. Shu;Yuesen Wang;Xu Wang
中科院分区：
文献类型：
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作者：
Xingyu Liang;Xiuxiu Sun;H. Tian;G. Shu;Yuesen Wang;Xu Wang
热电发电机是内燃机余热回收的一种技术手段，它有助于提高效率。本文以内燃机排气为热源，建立了两阶段热电模型。通过对单级TEG和两级TEG的比较，分析了相关因素的影响，选择了两级TEG进行优化。结果表明，吸收的热量、输出功率和转换效率随着传热系数的增加而显著增加，直到400 W m−2K−1的值。热源温度的影响大于冷源的影响。同时，输出功率和吸收的热量都随着热电偶总数的增加而增加，而转换效率降低。最后，输出功率和转换效率随着热电偶比的变化而出现峰值。两级TEG在0.8 ~ 0.9之间达到最大输出功率。
A technical method of recovering exhaust heat in internal combustion engine (ICE) is the thermoelectric generator (TEG), which contributes to efficiency improvement. In this study, a two-stage thermoelectric model is built using the exhaust gas of ICE as heat source. After comparing the single- and two-stage TEG, we select the latter to be optimized by analyzing the effect of relevant factors. The results show that the absorbed heat, output power, and conversion efficiency increase significantly with increasing heat transfer coefficient up to the value of 400 W m−2K−1. The effect of heat source temperature is greater than that of the cold source. Meanwhile, both output power and absorbed heat increase with increments of the total number of thermocouples, whereas conversion efficiency decreases. Finally, output power and conversion efficiency exhibit a peak value with the variation of the thermocouple ratio. The two-stage TEG achieves maximum output power when the ratio is between 0.8 and 0.9.