Subambient daytime radiative cooling (SDRC) provides a promising electricity‐ and cryogen‐free pathway for global energy‐efficiency. However, current SDRC systems require stringent surface designs, which are neither cost‐effective nor eco‐friendly, to selectively emit thermal radiation to outer space and simultaneously maximize solar reflectance. Here, a generic method is developed to upgrade the conventional building‐coating materials with a peculiar self‐adaptive SDRC effect through combining particle scattering, sunlight‐excited fluorescence, and mid‐infrared broadband radiation. It is also theoretically proved that heat exchange with the sky can eliminate the use of resonant microstructures and noble metal mirrors in conventional SDRC, and also leads to enhanced daytime cooling yet suppressed nighttime overcooling. When exposed to direct sunlight, the upgraded coating over an aluminum plate can achieve 6 °C (7 °C on a scale‐model building) below the ambient temperature under a solar intensity of 744 W m⁻² (850 W m⁻²), yielding a cooling power of 84.2 W m⁻². The results pave the way for practical large‐scale applications of high‐performance SDRC for human thermal comfort in buildings.

中文翻译：

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通过智能环境辐射冷却技术创建环保型建筑涂料。

白天的低温辐射冷却（SDRC）为全球能源效率提供了一种有希望的无电和无制冷剂的途径。但是，当前的SDRC系统要求严格的表面设计（既不具有成本效益，又不环保），以选择性地向外部空间发射热辐射并同时最大化太阳反射率。在这里，开发了一种通用方法，通过结合粒子散射，阳光激发的荧光和中红外宽带辐射，以具有特殊的自适应SDRC效果的方式对常规建筑涂料进行升级。从理论上也证明了与天空的热交换可以消除传统SDRC中共振微结构和贵金属镜的使用，并且还可以增强白天的制冷能力，并抑制夜间的过度冷却。^-2（850 W m ^-2），产生的冷却功率为84.2 W m ^-2。结果为高性能SDRC的实际大规模应用铺平了道路，以实现建筑物的人为舒适性。