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Daytime radiative cooling using near-black infrared emitters

Kou, Jun-long and Jurado, Zoila and Chen, Zhen and Fan, Shanhui and Minnich, Austin J. (2017) Daytime radiative cooling using near-black infrared emitters. ACS Photonics, 4 (3). pp. 626-630. ISSN 2330-4022.

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Recent works have demonstrated that daytime radiative cooling under direct sunlight can be achieved using multilayer thin films designed to emit in the infrared atmospheric transparency window while reflecting visible light. Here, we demonstrate that a polymer-coated fused silica mirror, as a near-ideal blackbody in the mid-infrared and near-ideal reflector in the solar spectrum, achieves radiative cooling below ambient air temperature under direct sunlight (8.2 °C) and at night (8.4 °C). Its performance exceeds that of a multilayer thin film stack fabricated using vacuum deposition methods by nearly 3 °C. Furthermore, we estimate the cooler has an average net cooling power of about 127 Wm^(-2) during daytime at ambient temperature even considering the significant influence of external conduction and convection, more than twice that reported previously. Our work demonstrates that abundant materials and straight-forward fabrication can be used to achieve daytime radiative cooling, advancing applications such as dry cooling of thermal power plants.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kou, Jun-long0000-0002-0481-5149
Jurado, Zoila0000-0003-4160-5068
Minnich, Austin J.0000-0002-9671-9540
Additional Information:© 2017 American Chemical Society. Received: December 12, 2016. Published: February 3, 2017. This work is part of the 'Light-Material Interactions in Energy Conversion' Energy Frontier Research Center funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0001293. The authors thank Prof. George Rossman for FTIR assistance, the Kavli Nanoscience Institute at Caltech for cleanroom facilities, and the Molecular Materials Research Center of the Beckman Institute at Caltech for UV/vis/NIR measurement.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001293
Subject Keywords:passive radiative cooling, thermal radiation, infrared emitters
Issue or Number:3
Record Number:CaltechAUTHORS:20170208-075325428
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Official Citation:Daytime Radiative Cooling Using Near-Black Infrared Emitters Jun-long Kou, Zoila Jurado, Zhen Chen, Shanhui Fan, and Austin J. Minnich ACS Photonics 2017 4 (3), 626-630 DOI: 10.1021/acsphotonics.6b00991
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74143
Deposited By: Tony Diaz
Deposited On:08 Feb 2017 16:04
Last Modified:09 Mar 2020 13:19

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