聚光型太阳能热电转换系统性能分析

Performance Analysis of the Concentrating Solar Thermoelectric Conversion System

基于塞贝克热电转换效应,构建了聚光型太阳能热电转换系统模型。采用有限元法(FEM)计算了3种不同规格尺寸的温差发电材料的热电转换过程,分析了开路电压、输出功率、热转换效率等发电性能参数随着半导体材料尺寸、基材类型及聚热比等因素的变化规律。研究结果表明:所研究的3种材料晶粒类型中,晶粒最小的热电转换性能较佳;热电转换系统两端的冷热温差越大,产生的电压越大;基材面积与聚热比对热电转换系统的影响较大,系统输出功率与聚热比和基材面积近似呈线性关系;受热电材料品质因子的影响,系统热电转换效率随着基材面积与聚热比的增大呈先增大后减小的趋势。研究结果可为半导体热电转换系统的设计与优化提供依据。

Based on the Seebeck thermoelectric conversion effect,the model of concentrating solar thermoelectric conversion system is established.The thermoelectric conversion process of three kinds of thermoelectric power generation materials with different sizes are calculated by the finite element method（ FEM）,and variation rules of the power generation performance parameters with the size of semiconductor material substrate types and the thermal concentration ratio are analyzed,such as the open circuit voltage,output power,and the thermal conversion efficiency.The research results show that,the thermoelectric conversion performance of the minimum grain is better among the three types of materials.The larger the temperature difference between the two ends of the thermoelectric conversion system,the larger the voltage generated.The substrate area and thermal concentration ratio have a great effect on the thermoelectric conversion system,the system output power and thermal concentration ratio and substrate area is approximately linear.Affected by the quality factor of thermoelectric materials,the efficiency of the thermoelectric conversion system increases first and then decreases with the increase of the substrate area and thermal concentration ratio.The research results can provide the basis for the design and optimization of the semiconductor thermoelectric conversion system.