Experiments and simulations on heat exchangers in thermoelectric generator for automotive application
Experiments and simulations on heat exchangers in thermoelectric generator for automotive application
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DOI：
10.1016/j.applthermaleng.2014.07.022
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发表时间：
2014-10
影响因子：
6.4
通讯作者：
X. Liu;Y. Deng;K. Zhang;M. Xu;Y. Xu;C. Su
中科院分区：
文献类型：
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作者：
X. Liu;Y. Deng;K. Zhang;M. Xu;Y. Xu;C. Su
在这项工作中，建立了一个能量收集系统，从汽车排气管道中提取热量，并利用热电发电机(TEGS)将热量转化为电能。实验表明，汽车系统中的温差不是恒定的，尤其是换热器，不能为热电模块提供大量的热量。本文研究了排气试验台中不同换热器的热性能，并讨论了不同内部结构和厚度的换热器的热特性，以获得较高的界面温度和热均匀度。在计算流体力学模拟的基础上，利用测功机对一台高性能采油发动机进行了红外实验和输出功率测试。结果表明，内部结构为混沌、厚度为5 mm的板状换热器具有较理想的热性能，有利于提高三甘醇的热性能，从而获得较大的总输出功率。
In this work, an energy-harvesting system which extracts heat from an automotive exhaust pipe and turns the heat into electricity by using thermoelectric power generators (TEGs) was built. Experiments show that the temperature difference in automotive system is not constant, especially the heat exchanger, which cannot provide the thermoelectric modules (TMs) large amount of heat. The thermal performance of different heat exchangers in exhaust-based TEGs is studied in this work, and the thermal characteristics of heat exchangers with different internal structures and thickness are discussed, to obtain higher interface temperature and thermal uniformity. Following computational fluid dynamics simulations, infrared experiments and output power testing system are carried out on a high-performance production engine with a dynamometer. Results show that a plate-shaped heat exchanger with chaos-shaped internal structure and thickness of 5 mm achieves a relatively ideal thermal performance, which is practically useful to enhance the thermal performance of the TEG, and larger total output power can be thus obtained.