US 12,298,090 B2
Radiation cooling device using ceramic nanoparticle mixture
Heon Lee, Seoul (KR); Soo Min Son, Seoul (KR); Dong Woo Chae, Seoul (KR); and Han Gyu Lim, Seoul (KR)
Assigned to ZERC, Seoul (KR)
Appl. No. 17/918,198
Filed by ZERC, Seoul (KR)
PCT Filed Apr. 8, 2021, PCT No. PCT/KR2021/004422
§ 371(c)(1), (2) Date Feb. 14, 2023,
PCT Pub. No. WO2021/206474, PCT Pub. Date Oct. 14, 2021.
Claims priority of application No. 10-2020-0044215 (KR), filed on Apr. 10, 2020.
Prior Publication US 2023/0304751 A1, Sep. 28, 2023
Int. Cl. F28F 13/18 (2006.01)
CPC F28F 13/185 (2013.01) [F28F 2245/06 (2013.01); F28F 2255/20 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A radiative cooling device manufactured using a ceramic nanoparticle mixture, comprising:
a solar reflective layer formed of a metal material to reflect sunlight; and
an infrared radiation layer formed by mixing a plurality of ceramic nanoparticles based on any one of a size, thickness, and weight fraction determined in consideration of an absorptivity in a wavelength range corresponding to a sky window of atmosphere and configured to absorb and emit infrared rays in the wavelength range,
wherein the infrared radiation layer is formed by mixing at least two ceramic nanoparticle types of first ceramic nanoparticles having a first intrinsic emissivity in a first wavelength range, second ceramic nanoparticles having a second intrinsic emissivity in a second wavelength range, and third ceramic nanoparticles having a third intrinsic emissivity in a third wavelength range.