高导热辐射冷却膜用于增强日间被动冷却
Shijin Nie1, Lizhan Bai1, Guiping Lin1,2
1Laboratory of Fundamental Science on Ergonomics and Environmental Control, School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, P. R. China.
ACS applied materials & interfaces
|August 27, 2025
概括
这项研究引入了一种新的辐射冷却薄膜 (DPHA薄膜),通过整合内部热通道来提高冷却效率. DPHA薄膜表现出卓越的性能,在被动日间辐射冷却应用中提供显著的温度差异.
科学领域:
- 材料科学
- 热力学
- 可持续能源
背景情况:
- 通过反射太阳光和发射热量来提供节能冷却的被动日间辐射冷却 (PDRC).
- 实际PDRC受到热流不可逆性的限制,阻碍了最大的冷却潜力.
- 开发先进的辐射冷却材料对于高效的热管理至关重要.
研究的目的:
- 开发一种具有高导热性的集成辐射冷却膜,以提高冷却性能.
- 通过改善散热来克服传统辐射冷却材料的局限性.
- 评估新型RC膜的光学性能,导热性和耐久性.
主要方法:
- 具有内部热通道的集成辐射冷却膜 (DPHA膜) 的制造.
- 包括太阳反射率和红外发射率在内的光学特性.
- 在太阳辐射下测量温度差异并评估导热性.
- 在持续的紫外线照射下对抗衰老的评估.
主要成果:
- 该DPHA薄膜具有卓越的光学性能 (反射率~0.96,发射率~0.98).
- 在977W m-2的太阳强度下,最高温度差为17.5°C,平均为13.2°C.
- 该膜具有高的外平面导热率 (0.755 W m-1 K-1),从而促进了高效的散热.
- 经过30天的紫外线照射,DPHA薄膜表现出卓越的光学性能和耐老化性能.
结论:
- 开发的DPHA薄膜通过增强的导热性和优化的光学特性显著提高了辐射冷却性能.
- 这部电影显示了可扩展和具有成本效益的户外冷却应用的巨大潜力.
- 这项工作为开发高性能辐射冷却材料提供了一种新的方法.
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