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Recent Advances in Passive Radiative Cooling: Material Design Approaches

  • Heegyeom Jeon (Department of Advanced Materials Engineering, Chung-Ang University) ;
  • Youngjae Yoo (Department of Advanced Materials Engineering, Chung-Ang University)
  • Received : 2024.02.06
  • Accepted : 2024.02.29
  • Published : 2024.03.31

Abstract

Passive radiative cooling is a promising technology for cooling objects without energy input. Passive radiative cooling works by radiating heat from the surface, which then passes through the atmosphere and into space. Achieving efficient passive radiative cooling is mainly accomplished by using materials with high emissivity in the atmospheric window (8-13 ㎛). Research has shown that polymers tend to exhibit high emissivity in this spectral range. In addition to elastomers, other materials with potential for passive radiative cooling include metal oxides, carbon-based materials, and polymers. The structure of a passive radiative cooling device can affect its cooling performance. For example, a device with a large surface area will have a greater amount of surface area exposed to the sky, which increases the amount of thermal radiation emitted. Passive radiative cooling has a wide range of potential applications, including building cooling, electronics cooling, healthcare, and transportation. Current research has focused on improving the efficiency of passive radiative cooling materials and devices. With further development, passive radiative cooling can significantly affect a wide range of sectors.

Keywords

Acknowledgement

This research was supported by the Chung-Ang University Research Grants in 2023. This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT, Korea) (No. 2023R1A2C1005459).

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