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

Byoungsu Ko, Dasol Lee, Trevon Badloe and Junsuk Rho
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Byoungsu Ko: Department of Mechanical Engineering, Myongji University, Yongin 17058, Korea
Dasol Lee: Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
Trevon Badloe: Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
Junsuk Rho: Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea

Energies, 2018, vol. 12, issue 1, 1-14

Abstract: 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.

Keywords: metamaterial; daytime radiative cooling; infrared atmospheric window; selective reflection; selective emission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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