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2016 ; 3
(7
): 1500360
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Radiative Cooling: Principles, Progress, and Potentials
#MMPMID27812478
Hossain MM
; Gu M
Adv Sci (Weinh)
2016[Jul]; 3
(7
): 1500360
PMID27812478
show ga
The recent progress on radiative cooling reveals its potential for applications
in highly efficient passive cooling. This approach utilizes the maximized
emission of infrared thermal radiation through the atmospheric window for
releasing heat and minimized absorption of incoming atmospheric radiation. These
simultaneous processes can lead to a device temperature substantially below the
ambient temperature. Although the application of radiative cooling for nighttime
cooling was demonstrated a few decades ago, significant cooling under direct
sunlight has been achieved only recently, indicating its potential as a practical
passive cooler during the day. In this article, the basic principles of radiative
cooling and its performance characteristics for nonradiative contributions, solar
radiation, and atmospheric conditions are discussed. The recent advancements over
the traditional approaches and their material and structural characteristics are
outlined. The key characteristics of the thermal radiators and solar reflectors
of the current state-of-the-art radiative coolers are evaluated and their
benchmarks are remarked for the peak cooling ability. The scopes for further
improvements on radiative cooling efficiency for optimized device characteristics
are also theoretically estimated.
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