Abstract Radiative cooling is a passive means of cooling that does not require the consumption of additional energy and has broad application potential. While experimental spectral measurements have been conducted, the daylighting of buildings, photovoltaic (PV) cells, and vehicles has seldom been considered. Here, we use spectrum-selective coatings to resolve the competing demands of daylighting (or appearance) and radiative cooling. A simple liquid blade-coating method that was inexpensive, convenient, and scalable was used to achieve radiative cooling with ultrahigh transmittance in visible light and excellent cooling performance. Resonant polar dielectric SiO2 microparticles with optimized volumetric fractions and diameters were randomly mixed into an acrylic resin and manually bladed at room temperature with natural evaporation drying. Spectrometry results showed that a mean visible light transmittance >91.3% was achieved, which was much higher than reported in previous studies; a mean emittance >93.7% within the “atmospheric window” was also reached. Over four days testing of a silver-plated aluminum sheet in a populous area at sea level, we achieved a maximum sub-ambient decrease in temperature of ~8.7 °C and a maximum cooling power of 108.49 W/m2.

中文翻译：

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在“大气窗口”内具有超高可见光透射率和发射的低成本辐射冷却叶片涂层

摘要 辐射冷却是一种被动的冷却方式，不需要额外消耗能量，具有广泛的应用潜力。虽然已经进行了实验光谱测量，但很少考虑建筑物、光伏 (PV) 电池和车辆的采光。在这里，我们使用光谱选择性涂层来解决采光（或外观）和辐射冷却的竞争需求。一种简单、廉价、方便且可扩展的液体刮刀涂层方法用于实现辐射冷却，在可见光下具有超高透射率和优异的冷却性能。将具有优化体积分数和直径的共振极性介电 SiO2 微粒随机混合到丙烯酸树脂中，并在室温下通过自然蒸发干燥手动刮削。光谱分析结果表明，平均可见光透射率 >91.3%，远高于以往研究报告；还达到了“大气窗口”内的平均辐射率 > 93.7%。在海平面人口稠密的地区对镀银铝板进行了四天的测试，我们实现了约 8.7 °C 的最大低于环境温度的降低和 108.49 W/m2 的最大冷却功率。