Experiment on thermal uniformity and pressure drop of exhaust heat exchanger for automotive thermoelectric generator
Experiment on thermal uniformity and pressure drop of exhaust heat exchanger for automotive thermoelectric generator
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汽车热电发电机排气热交换器热均匀性及压降实验
DOI：
10.1016/j.energy.2013.02.067
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发表时间：
2013-06
期刊：
影响因子：
9
通讯作者：
Chen, Lidong
中科院分区：
文献类型：
--
作者：
Lu, Hongliang;Wu, Ting;Bai, Shengqiang;Xu, Kangcong;Huang, Yingjie;Gao, Weimin;Yin, Xianglin;Chen, Lidong
排气热电机组的发电依赖于热能和热电转换效率。为了增加废气中提取的热能，需要高效率的换热器。一方面，典型换热器的换热与压降是耦合的；另一方面，为了降低噪声，消声器不可避免地会导致排气产生较大的压降。本文尝试将排气换热器与消声器概念地结合在一起，采用1进2出、2进2出和基线空腔的形式。开发了一种试验台，用于比较多种车辆运行条件下的热均匀度和压降特性。1-进水口-2-出水口增加了水力扰动，强化了换热，导致流动更均匀，表面温度更高。然而，平均表面温度低于100℃，显著限制了热电转换效率。当进口温度为100℃、质量流量为131 kg/h时，1进2出、2进2出比空腔压降大165%、318%；当进气温度400℃、质量流量156 kg/h时，1进2出、2进2出比空腔压降大319%、523%。
The power generation of exhaust TEG (thermoelectric generator) depends on heat energy and thermoelectric conversion efficiency. High efficiency heat exchanger is necessary to increase the amount of heat energy extracted from exhaust gas. On one hand, heat transfer is coupled with pressure drop for typical heat exchanger; on the other hand, the muffler unavoidably leads exhaust to large pressure drop for noise reduction. The present work tried to conceptually combine exhaust heat exchanger with muffler in the form of 1-inlet 2-outlet, 2-inlet 2-outlet and the baseline empty cavity. A test bench was developed to compare thermal uniformity and pressure drop characteristics over multiple vehicle operating conditions. 1-Inlet 2-outlet increased hydraulic disturbance and enhanced heat transfer, resulting in the more uniform flow distribution and higher surface temperature than the other. However, the averaged surface temperature was less than 100 °C, significantly limiting thermoelectric conversion efficiency. The pressure drops of 1-inlet 2-outlet, 2-inlet 2-outlet were 165%, 318% more than that of empty cavity when inlet temperature was 100 °C and mass flow rate was 131 kg/h, and were 319%, 523% more than that of empty cavity when inlet temperature 400 °C and mass flow rate 156 kg/h.
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