The concentration of solar radiation by either a lens or a mirror is one of the options for practical utilisation of light to obtain higher temperatures. However, it is difficult to maintain high temperatures on the hot side of the module due to solar diurnal motion. This study evaluates the influence of the thermoelectric (TE) output by optical light concentration. Three-dimensional partial differential equations describing heat balance and TE phenomena were simultaneously solved by applying numerical methods, and the temperature distribution in the whole TE module as well as the current density were simulated. It was shown that the three models of light concentration on a single TE module (BiTe-based, four legs having dimensions of 10 mm x 10 mm x 10 mm) generate a similar output in the external load. This happens because the long leg becomes a large thermal resistance, and because the alumina plate (1 mm thick) with a high thermal conductivity covers the top of the TE modules. The homogenised temperature at the hot junctions generates a similar output in all three models when the cold terminals were kept at constant temperature.
展开▼
机译：通过透镜或镜子集中太阳辐射是实际利用光以获得更高温度的选择之一。但是，由于太阳的昼夜运动，难以在模块的热侧维持高温。这项研究评估了光聚光对热电（TE）输出的影响。应用数值方法同时求解了描述热平衡和TE现象的三维偏微分方程，并模拟了整个TE模块的温度分布和电流密度。结果表明，在单个TE模块上的三种聚光模型（基于BiTe的四个支脚尺寸为10 mm x 10 mm x 10 mm）在外部负载中产生相似的输出。发生这种情况是因为长脚的热阻大，并且导热率高的氧化铝板（1毫米厚）覆盖了TE模块的顶部。当冷端保持恒定温度时，在所有三个模型中，热端处的均质温度会产生相似的输出。
展开▼
