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Effect of Convection Heat Transfer on Performance of Waste Heat Thermoelectric Generator

机译：对流换热对余热热电发电机性能的影响

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摘要

Efficiency of energy conversion processes can be improved if waste heat is converted to electricity. A thermoelectric generator (TEG) can directly convert waste heat to electricity. The TEG typically suffers from low efficiency due to various reasons, such as ohmic heating, surface-to-surrounding convection losses, and unfavorable material properties. In this work, the effect of surface-to-surrounding convection heat transfer losses on the performance of TEG is studied analytically and numerically. A one-dimensional (J-D) analytical model is developed that includes surface convection, conduction, ohmic heating, and Peltier, Seebeck, and Thomson effects with top and bottom surfaces of TEG exposed to convective boundary conditions. Using the analytical solutions, different performance parameters (e.g., heat input, power output, and efficiency) are calculated and expressed graphically as functions of thermal source and sink temperatures and convection heat transfer coefficient. Finally, a two-dimensional (2-D) mathematical model is solved numerically to observe qualitative results of thermal and electric fields inside the TEG. For all calculations, temperature-dependent thermal/electric properties are considered. Increase in thermal source temperature results in an increase in the power output with adiabatic side wall conditions. A change in boundary condition to convection heat transfer from adiabatic boundary has a large impact on thermal efficiency.
机译：如果将废热转换为电能，则可以提高能量转换过程的效率。热电发电机（TEG）可以直接将废热转化为电能。由于各种原因，例如欧姆加热，表面到周围的对流损耗以及不利的材料性能，TEG通常会效率低下。在这项工作中，从表面到周围的对流换热损失对TEG性能的影响进行了分析和数值研究。开发了一个一维（J-D）分析模型，该模型包括表面对流，传导，欧姆加热以及珀耳帖，塞贝克和汤姆森效应，TEG的顶部和底部表面暴露于对流边界条件。使用分析解决方案，可以计算出不同的性能参数（例如热量输入，功率输出和效率），并以图形形式表示为热源和散热器温度以及对流传热系数。最后，对二维（2-D）数学模型进行数值求解，以观察TEG内部的热和电场的定性结果。对于所有计算，都要考虑温度相关的热/电性能。热源温度的升高导致绝热侧壁条件下功率输出的增加。从绝热边界到对流传热的边界条件改变对热效率有很大影响。

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  • 来源
    《Heat Transfer Engineering》 |2015年第18期|1458-1471|共14页
  • 作者

    RONIL RABARI; SHOHEL MAHMUD; ANIMESH DUTTA; MOHAMMAD BIGLARBEGIAN;

  • 作者单位

    School of Engineering, University of Guelph, Guelph, Ontario, Canada;

    School of Engineering, University of Guelph, 50 Stone Road East, Guelph, ON, Canada N1G 2W1;

    School of Engineering, University of Guelph, Guelph, Ontario, Canada;

    School of Engineering, University of Guelph, Guelph, Ontario, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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