Effect of engine exhaust gas pulsations on the performance of a thermoelectric generator for wasted heat recovery: An experimental and analytical investigation
Effect of engine exhaust gas pulsations on the performance of a thermoelectric generator for wasted heat recovery: An experimental and analytical investigation
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DOI：
10.1016/j.energy.2018.08.065
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发表时间：
2018-11
期刊：
影响因子：
9
通讯作者：
A. Nour Eddine;D. Chalet;X. Faure;L. Aixala;P. Chessé
中科院分区：
文献类型：
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作者：
A. Nour Eddine;D. Chalet;X. Faure;L. Aixala;P. Chessé
利用热电发电机（TEG）回收内燃机的废热是一种很有前途的解决方案，以提高效率。本研究调查了发动机运行过程中TEG的行为。它区分了发动机流动特性对TEG性能的影响。三个试验台已被设计和建造，以调查这种影响。结果表明，影响TEG性能的主要有两个参数：发动机排气成分和发动机排气脉动，并建立了分析模型，以确定和量化各参数对热电模块与排气间对流换热系数的影响，从而对TEG性能产生影响。试验结果表明，在完全相似的TEG入口温度和质量流量下，热空气和真实的发动机试验之间的TEG输出功率差异高达30%。该模型确定，该差异的5-12%与气体成分有关，而另一个试验台证明，发动机排气脉动流是其余差异（88-95%）的原因。将进行进一步的研究，以改善由于这种脉动效应行为的TEG设计。
Using thermoelectric generator (TEG) for waste heat recovery on internal combustion engines is a promising solution for efficiency improvement. This study investigates the behavior of TEG during engine operation. It distinguishes the effect of the engine flow properties on the TEG performance. Three test rigs have been designed and built to investigate this effect. The results confirm that there are two main engine exhaust gas properties that affect the TEG performance, namely: engine exhaust gas composition and engine exhaust gas pulsation.An analytical model has been developed to identify and quantify the effect of each parameter on the convective heat transfer coefficient between the exhaust gas and the thermoelectric module, hence on the TEG performance. Test results show a difference in the TEG output power up to 30% between hot air and real engine test at perfectly similar TEG inlet temperature and mass flow rate. The model identifies that 5–12% of this difference is related to the gas composition whereas another test rig proves that the engine exhaust pulsating flow is responsible for the remaining difference (88–95%). Further studies will be conducted to improve the TEG design thanks to this pulsation effect behavior.