Yang Meng, Zeng Yijun, Du Qingyuan, Sun Haoyang, Yin Yingying, Yan Xiantong, Jiang Mengnan, Pan Chin, Sun Dazhi, Wang Zuankai
City University of Hong Kong, Hong Kong SAR, China.
Southern University of Science and Technology, Shenzhen, China.
Nanophotonics. 2024 Jan 15;13(5):629-637. doi: 10.1515/nanoph-2023-0641. eCollection 2024 Mar.
Passive daytime radiative cooling that could provide sub-ambient cooling emerges as a promising technology to reduce household energy consumption. Nonetheless, prevailing studies are predominantly focused on surface cooling, often overlooking its adaptability to enclosed spaces with active cooling technologies. Here we present a multilayer radiative cooling film (-MRC) with optical properties in the mid-infrared region, consisting of the nanoporous polyethylene films, the polyethylene oxide film, and silver nanowires. The top side of the -MRC functions as a conventional radiative cooling material to supply sub-ambient surface cooling, while the bottom side with low mid-infrared emissivity transfers limited heat via thermal radiation to the low-temperature enclosures. Our experiments validate that the -MRC possesses an enhanced space cooling performance in comparison to the conventional radiative cooling film. This work provides a valuable design concept for radiative cooling materials, thereby expanding their practical scenarios and contributing to reduce the carbon emission.
能够提供低于环境温度冷却的被动式日间辐射冷却技术，作为一种有望降低家庭能源消耗的技术应运而生。尽管如此，目前的研究主要集中在表面冷却，常常忽视其与主动冷却技术在封闭空间中的适应性。在此，我们展示了一种在中红外区域具有光学特性的多层辐射冷却薄膜（-MRC），它由纳米多孔聚乙烯薄膜、聚环氧乙烷薄膜和银纳米线组成。-MRC的顶面充当传统辐射冷却材料，提供低于环境温度的表面冷却，而具有低中红外发射率的底面通过热辐射将有限的热量传递到低温封闭空间。我们的实验证实，与传统辐射冷却薄膜相比，-MRC具有增强的空间冷却性能。这项工作为辐射冷却材料提供了一个有价值的设计理念，从而扩展了它们的实际应用场景，并有助于减少碳排放。
