Spectrally Selective Inorganic-Based Multilayer Emitter for Daytime Radiative Cooling

白天 辐射冷却 辐射传输 材料科学 共发射极 大气科学 光电子学 光学 工程物理 纳米技术 气象学 物理 地质学 工程类
作者
Dongwoo Chae,Mingeon Kim,Pil-Hoon Jung,Soomin Son,Junyong Seo,Yuting Liu,Bong Jae Lee,Heon Lee
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:12 (7): 8073-8081 被引量:312
标识
DOI:10.1021/acsami.9b16742
摘要

Daytime radiative coolers are used to pump excess heat from a target object into a cold exterior space without energy consumption. Radiative coolers have become attractive cooling options. In this study, a daytime radiative cooler was designed to have a selective emissive property of electromagnetic waves in the atmospheric transparency window of 8–13 μm and preserve low solar absorption for enhancing radiative cooling performance. The proposed daytime radiative cooler has a simple multilayer structure of inorganic materials, namely, Al2O3, Si3N4, and SiO2, and exhibits high emission in the 8–13 μm region. Through a particle swarm optimization method, which is based on an evolutionary algorithm, the stacking sequence and thickness of each layer were optimized to maximize emissions in the 8–13 μm region and minimize the cooling temperature. The average value of emissivity of the fabricated inorganic radiative cooler in the 8–13 μm range was 87%, and its average absorptivity in the solar spectral region (0.3–2.5 μm) was 5.2%. The fabricated inorganic radiative cooler was experimentally applied for daytime radiative cooling. The inorganic radiative cooler can reduce the temperature by up to 8.2 °C compared to the inner ambient temperature during the daytime under direct sunlight.
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