理论设计对于高性能太阳能光热转换薄膜的实验制备极为重要。然而,大多数软件通常局限于正入射情况下的太阳光吸收率的优化,而无法直接对太阳能光热转换效率这一重要指标进行优化。鉴于以上问题,使用传输矩阵方法与遗传优化算法,通过改变金属/介质多层膜基太阳能光热转换薄膜中各层薄膜的厚度,直接对其光热转换效率进行优化设计。重点研究了薄膜层数、太阳光照度与工作环境温度对钨/氧化铝基(W/Al2O3)多层膜的影响。研究结果表明,在聚光比为1和100情况下,该膜系的最优膜层数分别为6与8。该研究结果对于高性能太阳能光热转换薄膜的实验制备具有重要的指导意义。

Theoretical design is very critical for the experimental fabrication of a high-efficiency solar photothermal conversion film structure. However, most softwares are usually limited to the optimization of solar absorption under the normal incident condition, rather than focusing on the criteria of solar photothermal conversion efficiency (PCE). In view of the above problems, the transfer matrix method and the genetic optimization algorithm are used to directly optimize the photothermal conversion efficiency of a multilayered metal/dielectric film structure by changing the thickness of each layer of the film. The effects of the film layer number, solar illuminance, and ambient temperature on tungsten-alumina-based (W/Al₂O₃) multilayered film structures are studied. The results show that the optimal number of film layers is 6 for solar concentration ratio of 1 and 8 for that of 100. These results have important guiding significance in the experimental fabrication of high-efficiency solar photothermal conversion films.