Mechanically Robust and Spectrally Selective Convection Shield for Daytime Subambient Radiative Cooling

Zhang, Ji; Zhou, Zhihua; Tang, Huajie; Xing, Jincheng; Liu, Junwei; Quan, Jiayou; Yu, Junrong; Hu, Mingke

Abstract

As a passive cooling strategy, radiative cooling is becoming an
appealing approach to dissipate heat from terrestrial emitters to the outer space. However, the currently achieved cooling performance is still underperforming due to considerable solar radiation absorbed by the emitter and nonradiative heat transferred from the surroundings. Here, we proposed a mechanically robust and spectrally selective convection shield composed of nanoporous composite fabric (NCF) to achieve daytime subambient radiative cooling. By selectively reflecting ∼95% solar radiation, transmitting ∼84% thermal radiation, and suppressing the nonradiative heat transferred from warmer surroundings, the NCF-based radiative cooler demonstrated an average daytime temperature reduction of ∼4.9 °C below the ambient temperature, resulting in an average net radiative cooling power of ∼48 W/m2 over a 24 h measurement. In addition, we also modeled the potential cooling capacity of the NCF-based radiative cooler and demonstrated that it can cover the cooling demands of energy-efficient residential buildings in most regions of China. Excellent spectral selectivity, mechanical strength, and weatherability of the NCF cover enable a much broader selection for the emitters, which is promising in the real-world deployment of direct daytime subambient radiative cooling.

Citation

Zhang, J., Zhou, Z., Tang, H., Xing, J., Liu, J., Quan, J., …Hu, M. (2021). Mechanically Robust and Spectrally Selective Convection Shield for Daytime Subambient Radiative Cooling. ACS Applied Materials and Interfaces, 13(12), 14132-14140. https://doi.org/10.1021/acsami.0c21204

• Journal Article Type: Article
• Acceptance Date: Mar 5, 2021
• Online Publication Date: Mar 16, 2021
• Publication Date: Mar 31, 2021
• Deposit Date: Apr 15, 2021
• Publicly Available Date: Mar 17, 2022
• Journal: ACS Applied Materials & Interfaces
• Print ISSN: 1944-8244
• Electronic ISSN: 1944-8252
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 13
• Issue: 12
• Pages: 14132-14140
• DOI: https://doi.org/10.1021/acsami.0c21204
• Keywords: General Materials Science
• Public URL: https://nottingham-repository.worktribe.com/output/5466683
• Publisher URL: https://pubs.acs.org/doi/10.1021/acsami.0c21204