Aqueous double-layer paint of low thickness for sub-ambient radiative cooling-Reference-Cited by-同舟云学术

Aqueous double-layer paint of low thickness for sub-ambient radiative cooling

Published:2024-01-18 Issue:0 Volume:0 Page:
ISSN:2192-8606
Container-title:Nanophotonics
language:en
Short-container-title:

Author:

Dopphoopha Benjamin¹^ORCID,Li Keqiao¹,Lin Chongjia¹^ORCID,Huang Baoling²³⁴^ORCID

Affiliation:

1. The Department of Mechanical and Aersopace Engineering , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong , China

2. The Department of Mechanical and Aersopace Engineering, Foshan Research Institute for Smart Manufacturing , The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon , Hong Kong , China

3. HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute , Futian , Shenzhen 518000 , China

4. Thrust of Sustainable Energy and Environment , The Hong Kong University of Science and Technology , Guangzhou , China

Abstract

Abstract Radiative cooling may serve as a promising option to reduce energy consumption for space cooling. Radiative cooling paints provide a cost-effective and scalable solution for diverse applications and attract great attention, but the state-of-art cooling paints generally use non-eco-friendly organic solvents and need large thicknesses (>400 μm) to realize high performance, which leads to high cost and environmental issues in implementation. This work aims to address these challenges by developing eco-friendly aqueous paints with low thickness (below 150 μm) by adopting a double-layer design based on a complementary spectrum strategy. The structure consists of a wide bandgap top layer to scatter short-wavelength light and a bottom layer with high reflectance to visible and near-infrared (NIR) irradiation. Effects of different design factors are studied using numerical simulation and experiments to attain the optimal design. The resulting Y2O3–ZnO paints show a strong reflectance of 95.4 % and a high atmospheric window emissivity of 0.93 at a low thickness of 150 μm. Field tests in the subtropic humid climate of Hong Kong demonstrated sub-ambient cooling of 2 °C at noon and 4 °C at night without shielding convection. The paints also show high robustness and excellent resistance to water and UV light attacks, rendering them promising for large-scale applications.

Funder

Project of Hetao Shenzhen- Hong Kong Science and Technology Innovation Cooperation Zone

Hong Kong General Research Fund

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology

Link

https://www.degruyter.com/document/doi/10.1515/nanoph-2023-0664/pdf

Reference45 articles.

1. D. D’Agostino, B. Cuniberti, and P. Bertoldi, “Energy consumption and efficiency technology measures in European non-residential buildings,” Energy Build., vol. 153, pp. 72–86, 2017. https://doi.org/10.1016/J.ENBUILD.2017.07.062.

2. L. Pérez-Lombard, J. Ortiz, and C. Pout, “A review on buildings energy consumption information,” Energy Build., vol. 40, no. 3, pp. 394–398, 2008. https://doi.org/10.1016/j.enbuild.2007.03.007.

3. M. Lu and J. Lai, “Review on carbon emissions of commercial buildings,” Renew. Sustain. Energy Rev., vol. 119, pp. 1–2, 2020. https://doi.org/10.1016/j.rser.2019.109545.

4. D. Zhou, C. Y. Zhao, and Y. Tian, “Review on thermal energy storage with phase change materials (PCMs) in building applications,” Appl. Energy, vol. 92, pp. 593–605, 2012, https://doi.org/10.1016/j.apenergy.2011.08.025.

5. Z. M. Gilvaei, A. H. Poshtiri, and A. M. Akbarpoor, “A novel passive system for providing natural ventilation and passive cooling: evaluating thermal comfort and building energy,” Renew. Energy, vol. 198, pp. 463–483, 2022, https://doi.org/10.1016/j.renene.2022.07.151.