【作者】 赵青义；

【导师】 石晓光；

【作者基本信息】 长春理工大学 ， 物理电子学， 2010， 硕士

【摘要】 TEG(Thermoelectric Generator)是一种半导体温差发电器,利用温差产生电能,具有无运动部件、稳定性高、绿色无污染等优点。它可以根据不同的应用条件,制成各种形状,随着无线传感网络在各种应用领域的飞速发展,TEG作为自供电传感器的电源,显示出了极高的应用价值。本文从基本的热电理论出发,推导了TEG热电转换性能的重要参数,即热力学效率和功率密度。并从热量传递的角度,建立了TEG的热传导模型,这个模型包括了汤姆逊热、焦耳热、帕尔贴热以及热阻和电阻对TEG热电转换性能的影响。得到了输出功率与热阻的关系,并根据热阻和负载电阻对TEG的几何结构进行了优化。近年来,TEG的研究致力于开发高优值系数的薄膜热电材料。然而对于如此薄的热电材料,为了获得更大的温差,得到更高的输出电压和功率密度,必须解决冷端的散热问题,才能发挥这种材料的优势。因此,TEG冷端的散热技术成为了开发高性能TEG系统的关键技术之一,本文分析了散热器对薄膜TEG热电转换性能的限制,得到了热力学效率和功率密度与散热器换热系数的关系,并进行了优化。可为如何根据散热条件选择适合的TEG器件提供参考。更多还原

【Abstract】 TEG is a semiconductor thermoelectric generator that can convert heat into electric power under the temperature differences. It has many attractive features, such as no moving parts and reduced maintenance, and can be designed into a number of shapes for many specific applications. With the autonomous sensor systems play an increasing role in many areas, distributed sensor networks enable much of applications for TEG.In the paper, an analysis of a TEG is presented and expressions derived for the thermodynamic efficiency, optimum efficiency, maximum power output, and maximum power output per unit area. A new analytical heat conduction model for TEG was built. The model includes the Thomson heat, the Peltier heat, Joule heat, as well as all thermal and electrical resistances. Geometry optimization is presented.Many recent advances in TEG have focused on the nanoscale engineering of materials for higher figure of merit (2). A thermoelectric generator using these thin-film materials can present new challenges due to its inherently large temperature gradient, but also correspondingly larger generated power if the heat can be managed. In such cases performance is expected to be limited as much by the heat sink as by intrinsic material properties. New criteria for optimizing the generated power density of devices in this regime are discussed.更多还原