Comparison of the two-stage and traditional single-stage thermoelectric generator in recovering the waste heat of the high temperature exhaust gas of internal combustion engine
Comparison of the two-stage and traditional single-stage thermoelectric generator in recovering the waste heat of the high temperature exhaust gas of internal combustion engine
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DOI：
10.1016/j.energy.2014.09.032
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发表时间：
2014-12
期刊：
影响因子：
9
通讯作者：
Xiuxiu Sun;Xingyu Liang;G. Shu;H. Tian;Haiqiao Wei;Xiangxiang Wang
中科院分区：
文献类型：
--
作者：
Xiuxiu Sun;Xingyu Liang;G. Shu;H. Tian;Haiqiao Wei;Xiangxiang Wang
本文建立了两级串联和并联温差发电器的数学模型。模型采用低温热电材料碲化铋和中温方钴矿，以内燃机尾气为热源。热电材料的性能被发现是温度依赖性。其输出功率、转换效率和火用效率等性能随热源温度、冷源温度、冷热端换热系数的变化而变化。串联/并联两级温差发电器和单级温差发电器的外电阻对系统的性能有影响。结果表明，当传热系数大于400 W/m2 K时，热源温度对温差发电器设计的选择起着关键作用。当热源温度低于600 K时，碲化铋热电材料的单级温差发电器的性能优于两级温差发电器;串联两级温差发电器的输出功率和转换效率的最大值分别提高了10.9%和12.4%，当热源温度为800 K时，最大火用效率比单级火用效率提高12.5%。
Models of two-stage serial and parallel thermoelectric generators have been established in this paper. Low-temperature thermoelectric material bismuth telluride and medium-temperature skutterudite are employed in the models and the exhaust gas of internal combustion engine is used as heat source. The properties of the thermoelectric materials are found to be temperature dependent. The performances including the output power, conversion efficiency and exergy efficiency vary with the temperatures of the heat and cold sources, the heat transfer coefficient between the hot and cold sides. The performances are influenced by the external resistances of the serial/parallel two-stage thermoelectric generators and the single-stage thermoelectric generator. The results show that the heat source temperature plays a key role in selection of the design of a thermoelectric generator when the heat transfer coefficient is more than 400 W/m2K. The performances of the single-stage thermoelectric generator of thermoelectric material bismuth telluride is better than those of the two stage thermoelectric generator when the heat source temperature is less than 600 K; the maximum values of the output power and conversion efficiency of a serial two-stage thermoelectric generator are 10.9% and 12.4% higher, the maximum exergy efficiency is 12.5% higher than those of the single-stage one, when the temperature of the heat source is 800 K.