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Full daytime sub-ambient radiative cooling in commercial-like paints with high figure of merit

Xiangyu Li1,2, Joseph Peoples1,2, Zhifeng Huang1,3, Zixuan Zhao1, Jun Qiu1,4,5, Xiulin Ruan1,2*

1 School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA

2 Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907, USA

3 School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China

4 School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

5 State Key Laboratory for Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

* Corresponding authors emails: ruan@purdue.edu
DOI10.24435/materialscloud:6c-my [version v1]

Publication date: Sep 25, 2020

How to cite this record

Xiangyu Li, Joseph Peoples, Zhifeng Huang, Zixuan Zhao, Jun Qiu, Xiulin Ruan, Full daytime sub-ambient radiative cooling in commercial-like paints with high figure of merit, Materials Cloud Archive 2020.111 (2020), doi: 10.24435/materialscloud:6c-my.

Description

Radiative cooling is a passive cooling technology by reflecting sunlight and emitting radiation in the sky window. Although highly desired, full daytime sub-ambient radiative cooling in commercial-like single-layer particle-matrix paints is yet to be achieved. Here we demonstrate full daytime sub-ambient radiative cooling in CaCO3-acrylic paint by utilizing the large bandgap CaCO3 fillers, a high particle concentration of 60% and a broad size distribution. Our paint shows high solar reflectance of 95.5% and high normal emissivity of 0.94 in the sky window. Field tests show cooling power exceeding 37W/m2 and surface temperature more than 1.7˚C below ambient at noon. A figure of merit RC is proposed to compare the cooling performance independent of weather conditions. The standard RC of our paint is 0.49, among the best radiative cooling performance while offering unprecedented benefits of the convenient paint form, low cost, and the compatibility with commercial paint fabrication process.

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Files

File name Size Description
Source Data and Codes.zip
MD5md5:d39ebf4970d8b7932449f62966036b40
13.6 MiB Source data for the figures in the paper and Supplemental Information, and codes for the Monte Carlo simulation.
Readme.txt
MD5md5:2a8e4b1e46f49d4505a310f8d755e6a0
3.5 KiB Readme.txt describing the contents of each file inside the .zip file

License

Files and data are licensed under the terms of the following license: Creative Commons Attribution 4.0 International.
Metadata, except for email addresses, are licensed under the Creative Commons Attribution Share-Alike 4.0 International license.

External references

Journal reference
X. Li, J. Peoples, Z. Huang, Z. Zhao, J. Qiu, X. Ruan, Cell Reports Physical Science (accepted)

Keywords

Daytime radiative cooling Atmospheric sky window Particle-matrix paint Figure of merit Monte Carlo simulation Lorentz-Mie theory

Version history:

2020.111 (version v1) [This version] Sep 25, 2020 DOI10.24435/materialscloud:6c-my