Subambient daytime radiative cooling of vertical surfaces
成果类型：
Article
署名作者：
Xie, Fei; Jin, Weiliang; Nolen, J. Ryan; Pan, Hao; Yi, Naiqin; An, Yang; Zhang, Zhiyu; Kong, Xiangtong; Zhu, Fei; Jiang, Ke; Tian, Sicong; Liu, Tianji; Sun, Xiaojuan; Li, Longnan; Li, Dabing; Xiao, Yun-Feng; Alu, Andrea; Fan, Shanhui; Li, Wei
署名单位：
Chinese Academy of Sciences; Chinese Academy of Sciences; Changchun Institute of Optics, Fine Mechanics & Physics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Stanford University; City University of New York (CUNY) System; Chinese Academy of Sciences; Changchun Institute of Optics, Fine Mechanics & Physics, CAS; Chinese Academy of Sciences; Chinese Academy of Sciences; Changchun Institute of Optics, Fine Mechanics & Physics, CAS; Peking University; Peking University; City University of New York (CUNY) System
刊物名称：
SCIENCE
ISSN/ISSBN：
0036-12826
DOI：
10.1126/science.adn2524
发表日期：
2024-11-15
页码：
788-794
关键词：
broad-band
energy
temperature
emission
light
films
摘要：
Subambient daytime radiative cooling enables temperatures to passively reach below ambient temperature, even under direct sunlight, by emitting thermal radiation toward outer space. This technology holds promise for numerous exciting applications. However, previous demonstrations of subambient daytime radiative cooling require surfaces that directly face the sky, and these cannot be applied to vertical surfaces that are ubiquitous in real-world scenarios such as buildings and vehicles. Here, we demonstrate subambient daytime radiative cooling of vertical surfaces under peak sunlight using a hierarchically designed, angularly asymmetric, spectrally selective thermal emitter. Under peak sunlight of about 920 watts per square meter, our emitter reaches a temperature that is about 2.5 degrees C below ambient temperature, corresponding to a temperature reduction of about 4.3 degrees and 8.9 degrees C compared with a silica-polymer hybrid radiative cooler and commercial white paint, respectively.