Radiative cooling is potentially one of the most innovative approaches to reducing energy density in buildings and industry, as well as achieving higher levels of energy efficiency. Several studies have reported the design of spectrally selective layered structures for daytime passive radiative cooling. However, a comprehensive design of such systems requires the spectral behavior of different materials and radiative heat transfer mechanisms to be addressed together. Here, we introduce a design methodology for daytime passive radiative cooling with thin film filters which accounts for the spectral tailoring at the visible and infrared spectrum. The major difference of this method is that it does not require a predefined target ideal emittance. The results show that higher cooling powers are possible compared to the previously reported thin-film structures, which were designed from a purely spectral perspective. The underlying mechanisms of the resulting spectral profiles, which give rise to improved performance, are investigated by wave impedance analysis. Cooling powers up to ${100}\,{{\rm W/m}^2}$ are obtained with seven layers on Ag. The findings of this study indicate that structures with better performance in terms of cooling powers and temperature reduction rates can be obtained following the procedure discussed.

中文翻译：

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用于被动辐射冷却的光谱选择滤波器设计

辐射冷却可能是降低建筑物和工业中能量密度以及实现更高能效水平的最具创新性的方法之一。几项研究报告了用于白天被动辐射冷却的光谱选择分层结构的设计。但是，此类系统的全面设计要求将不同材料的光谱特性和辐射传热机制一起解决。在这里，我们介绍了一种采用薄膜滤光片的白天被动辐射冷却的设计方法，该方法考虑了可见光谱和红外光谱的光谱调整。该方法的主要区别在于它不需要预定义的目标理想发射率。结果表明，与以前报道的从纯光谱角度设计的薄膜结构相比，更高的冷却能力是可能的。通过波阻抗分析研究了所产生的频谱轮廓的潜在机理，这些机理可提高性能。冷却功率高达$ {100} \，{{\ rm W / m} ^ 2} $是在Ag上七层获得的。这项研究的结果表明，按照所讨论的程序可以获得具有更好的冷却功率和降温速率性能的结构。