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Metamaterial-Based Radiative Cooling: Towards Energy-Free All-Day Cooling

1
Department of Mechanical Engineering, Myongji University, Yongin 17058, Korea
2
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
3
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
*
Author to whom correspondence should be addressed.
Energies 2019, 12(1), 89; https://doi.org/10.3390/en12010089
Received: 12 November 2018 / Revised: 2 December 2018 / Accepted: 15 December 2018 / Published: 28 December 2018
(This article belongs to the Section Thermal Management)
In the light of the ever increasing dangers of global warming, the efforts to reduce energy consumption by radiative cooling techniques have been designed, but are inefficient under strong sunlight during the daytime. With the advent of metamaterials and their selective control over optical properties, radiative cooling under direct sunlight is now possible. The key principles of metamaterial-based radiative cooling are: almost perfect reflection in the visible and near-infrared spectrum (0.3–3 µm) and high thermal emission in the infrared atmospheric window region (8–13 µm). Based on these two basic principles, studies have been conducted using various materials and structures to find the most efficient radiative cooling system. In this review, we analyze the materials and structures being used for radiative cooling, and suggest the future perspectives as a substitute in the current cooling industry. View Full-Text
Keywords: metamaterial; daytime radiative cooling; infrared atmospheric window; selective reflection; selective emission metamaterial; daytime radiative cooling; infrared atmospheric window; selective reflection; selective emission
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MDPI and ACS Style

Ko, B.; Lee, D.; Badloe, T.; Rho, J. Metamaterial-Based Radiative Cooling: Towards Energy-Free All-Day Cooling. Energies 2019, 12, 89.

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