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

Xiulin Ruan

doi:10.1117/12.2598072

3 August 2021 Full daytime sub-ambient radiative cooling in commercial-like paints with high figure of merit

Xiulin Ruan

Proceedings Volume 11824, New Concepts in Solar and Thermal Radiation Conversion IV; 118240F (2021) https://doi.org/10.1117/12.2598072
Event: SPIE Optical Engineering + Applications, 2021, San Diego, California, United States

Abstract

We demonstrate remarkable full-daytime subambient cooling performance with CaCO3 and BaSO4 nanoparticle paints. These fillers have a high electron band gap for low solar absorptance and phonon resonance or polymer absorption in the sky window for high sky window emissivity. With an appropriate particle size and a broad particle size distribution, the BaSO4 nanoparticle film reaches an ultrahigh solar reflectance of 97.6% and a high sky window emissivity of 0.96. During field tests, the BaSO4 film stays more than 4.5 °C below ambient temperature or achieves an average cooling power of 117 W/m2. The BaSO4-acrylic paint is developed with a 60% volume concentration to enhance the reliability in outdoor applications, achieving a solar reflectance of 98.1% and a sky window emissivity of 0.95. Field tests indicate similar cooling performance to the BaSO4 films. Overall, our BaSO4-acrylic paint shows a standard figure of merit of 0.77.

Conference Presentation

Citation Download Citation

Xiulin Ruan "Full daytime sub-ambient radiative cooling in commercial-like paints with high figure of merit", Proc. SPIE 11824, New Concepts in Solar and Thermal Radiation Conversion IV, 118240F (3 August 2021); https://doi.org/10.1117/12.2598072

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available