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Heat transfer enhancement of a modularised thermoelectric power generator for passenger vehicles

机译:乘用车模块化热电发电机的传热增强

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摘要

Transport represents over a quarter of Europe's greenhouse gas emissions and is the leading cause of air pollution in cities. It has not seen the same gradual decline in emissions as other sectors. Recently, the thermoelectric power generation (TEG) technology emerges as an alternative solution to the emission reduction challenge in this area. In this paper, we present an innovative pathway to an improved heat supply into the concentric shape-adapted TEG modules, integrating the heat pipe technologies. It relies on a phase changing approach which enhances the heat flux through the TEG surface. In order to improve the heat transfer for higher efficiency, in our work, the heat pipes are configured in the radial direction of the exhaust streams. The analysis shows that the power output is adequate for the limited space under the chassis of the passenger car. Much effort can also be applied to obtain enhanced convective heat transfer by adjusting the heat pipes at the dual sides of the concentric TEG modules. Heat enhancement at the hot side of the TEG has an effective impact on the total power out of the TEG modules. However, such improvements can be offset by the adjustment made from the coolant side. Predictably, the whole temperature profile of TEG system is subject to the durability and operational limitations of each component. Furthermore, the results highlight the importance of heat transfer versus the TEG power generation under two possible configurations in the passenger car. The highest power output per repeat unit is achieved at 29.8 W per 0.45 L with a ZT value 0.87 for a Bi2Te3-based thermoelectric material in our studies. The study provides an insight into a structurally achievable heat exchanger system for other high-temperature thermoelectric materials.
机译:交通运输占欧洲温室气体排放量的四分之一以上,是城市空气污染的主要原因。它没有看到与其他部门一样的排放量逐渐下降。最近,热电发电(TEG)技术作为该领域减排挑战的替代解决方案出现。在本文中,我们提出了一条创新的途径,即通过整合热管技术将热量提供给适应同心形状的TEG模块。它依靠一种相变方法来增强通过TEG表面的热通量。为了提高热传递效率,在我们的工作中,热管沿排气流的径向方向配置。分析表明,功率输出足以满足乘用车底盘下方有限的空间要求。通过调节同心TEG模块两侧的热管,也可以付出很多努力来获得增强的对流传热。 TEG热端的热量增强会对TEG模块的总​​功率产生有效影响。但是,这种改进可以通过从冷却剂侧进行的调整来抵消。可以预见,TEG系统的整个温度曲线受每个组件的耐用性和操作限制。此外,结果突出了在乘用车的两种可能配置下传热与TEG发电的重要性。在我们的研究中,基于Bi2Te3的热电材料的每个重复单元最高的功率输出为每0.45 L 29.8 W,ZT值为0.87。该研究为其他高温热电材料的结构上可行的热交换器系统提供了见识。

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