ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Preparation and cooling performance analysis of double-layer radiative cooling hybrid coatings with TiO2/SiO2/Si3N4 micron particles |
Yang-Chun Zhao(赵洋春) and Yong-Min Zhou(周勇敏)† |
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China |
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Abstract Passive daytime radiative cooling is achieved by radiating heat into outer space through electromagnetic waves without energy consumption. A scalable double-layer coating with a mixture of TiO2, SiO2, and Si3N4 micron particles for radiative cooling is proposed in this study. The finite-difference time-domain algorithm is used to analyze the influence of particle size and coating thickness on radiative cooling performance. The results of the simulation show that the particle size of 3 μ can give the best cooling performance, and the coating thickness should be above 25 μ m for SiO2 coating. Meanwhile, the mixture of SiO2 and Si3N4 significantly improves the overall emissivity. Through sample preparation and characterization, the mixture coating with a 1:1 ratio addition on an Al substrate exhibits high reflectivity with a value of 87.6% in the solar spectrum, and an average emissivity of 92% in the infrared region (2.5 μ m-15 μ m), which can be attributed to the synergy among the optical properties of the material. Both coatings can theoretically be cooled by about 8 °C during the day and about 21 °C at nighttime with hc=4 W·m-2·K-1. Furthermore, even considering the significant conduction and convection exchanges, the cooling effect persists. Outdoor experimental results show that the temperature of the double-layer radiative cooling coating is always lower than the ambient temperature under direct sunlight during the day, and can be cooled by about 5 °C on average, while lower than the temperature of the aluminum film by almost 12 °C.
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Received: 03 March 2023
Revised: 18 May 2023
Accepted manuscript online: 02 June 2023
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PACS:
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44.40.+a
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(Thermal radiation)
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42.79.Wc
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(Optical coatings)
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03.65.Nk
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(Scattering theory)
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Corresponding Authors:
Yong-Min Zhou
E-mail: yongminzhou@njtech.edu.cn
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Cite this article:
Yang-Chun Zhao(赵洋春) and Yong-Min Zhou(周勇敏) Preparation and cooling performance analysis of double-layer radiative cooling hybrid coatings with TiO2/SiO2/Si3N4 micron particles 2023 Chin. Phys. B 32 114401
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