期刊
ADVANCED OPTICAL MATERIALS
卷 9, 期 13, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202002226
关键词
daytime cooling; radiative cooling; rooftop measurements; selective emitter; selective reflector; transparent devices
资金
- Green Science program - POSCO
- National Research Foundation (NRF) - Ministry of Science and ICT, Republic of Korea [NRF-2019R1A2C3003129, CAMM-2019M3A6B3030637, NRF-2019R1A5A8080290, NRF-2018M3D1A1058997]
- Ministry of Education of the Korean government [NRF-2017H1A2A1043204]
- Hyundai Motor Chung Mong-Koo Foundation
- POSTECH
The proposed transparent radiative cooler is able to reduce temperatures while remaining transparent during the daytime by selectively blocking solar absorption, with the potential for practical applications such as passive diurnal cooling of vehicles or buildings.
Transparency is an important characteristic in practical applications of radiative cooling, but the transmitted sunlight trapped in an inner space is generally the main cause of the increasing temperature. A transparent radiative cooler that can lower a temperature during the daytime by transmitting visible light, reflecting near-infrared (NIR) light, and radiating thermal energy through the atmospheric window is proposed. In contrast to transparent selective emitters that transmit most of the incoming solar irradiance under direct sunlight and opaque radiative coolers that reflect all solar energy, the proposed cooler achieves transparency and the cooling effect simultaneously by selectively blocking solar absorption in the NIR regime. Outdoor rooftop measurements confirm that the cooler can reduce i) the inner temperature of an absorbing system and ii) its own temperature when combined with commercially available paints. During daytime, the cooler provides a temperature reduction of a maximum 14.4 degrees C and 10.1 degrees C for the inner and own temperature, respectively, and of an average 5.2 degrees C and 4.3 degrees C, respectively, in comparison to the transparent selective emitter. The proposed cooler can reduce the temperature during the daytime while maintaining transparency, confirming its possibilities in practical applications such as passive diurnal cooling of vehicles or buildings and compatibility with current paint technologies for aesthetic use.
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