辐射冷却
材料科学
白天
被动冷却
多孔性
光学
光电子学
红外线的
阳光
相位反转
辐射传输
复合材料
热的
气象学
化学
物理
大气科学
生物化学
膜
作者
Jyotirmoy Mandal,Yanke Fu,Adam Overvig,Mingxin Jia,Kerui Sun,Norman Nan Shi,Hua Zhou,Xianghui Xiao,Nanfang Yu,Yuan Yang
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2018-10-19
卷期号:362 (6412): 315-319
被引量:1178
标识
DOI:10.1126/science.aat9513
摘要
Passive daytime radiative cooling (PDRC) involves spontaneously cooling a surface by reflecting sunlight and radiating heat to the cold outer space. Current PDRC designs are promising alternatives to electrical cooling but are either inefficient or have limited applicability. We present a simple, inexpensive, and scalable phase inversion-based method for fabricating hierarchically porous poly(vinylidene fluoride-co-hexafluoropropene) [P(VdF-HFP)HP] coatings with excellent PDRC capability. High, substrate-independent hemispherical solar reflectances (0.96 ± 0.03) and long-wave infrared emittances (0.97 ± 0.02) allow for subambient temperature drops of ~6°C and cooling powers of ~96 watts per square meter (W m-2) under solar intensities of 890 and 750 W m-2, respectively. The performance equals or surpasses those of state-of-the-art PDRC designs, and the technique offers a paint-like simplicity.
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