Aqueous double-layer paint of low thickness for sub-ambient radiative cooling
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 s...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2024-01-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2023-0664 |
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| _version_ | 1850159203721674752 |
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| author | Dopphoopha Benjamin Li Keqiao Lin Chongjia Huang Baoling |
| author_facet | Dopphoopha Benjamin Li Keqiao Lin Chongjia Huang Baoling |
| author_sort | Dopphoopha Benjamin |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-165ae25420c749859cd2b7be75beaa61 |
| institution | OA Journals |
| issn | 2192-8614 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-165ae25420c749859cd2b7be75beaa612025-08-20T02:23:36ZengDe GruyterNanophotonics2192-86142024-01-0113565966810.1515/nanoph-2023-0664Aqueous double-layer paint of low thickness for sub-ambient radiative coolingDopphoopha Benjamin0Li Keqiao1Lin Chongjia2Huang Baoling3The Department of Mechanical and Aersopace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaThe Department of Mechanical and Aersopace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaThe Department of Mechanical and Aersopace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, ChinaThe 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, ChinaRadiative 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.https://doi.org/10.1515/nanoph-2023-0664multilayerradiative coolingmonte carlo simulationwater-based acrylic paint |
| spellingShingle | Dopphoopha Benjamin Li Keqiao Lin Chongjia Huang Baoling Aqueous double-layer paint of low thickness for sub-ambient radiative cooling Nanophotonics multilayer radiative cooling monte carlo simulation water-based acrylic paint |
| title | Aqueous double-layer paint of low thickness for sub-ambient radiative cooling |
| title_full | Aqueous double-layer paint of low thickness for sub-ambient radiative cooling |
| title_fullStr | Aqueous double-layer paint of low thickness for sub-ambient radiative cooling |
| title_full_unstemmed | Aqueous double-layer paint of low thickness for sub-ambient radiative cooling |
| title_short | Aqueous double-layer paint of low thickness for sub-ambient radiative cooling |
| title_sort | aqueous double layer paint of low thickness for sub ambient radiative cooling |
| topic | multilayer radiative cooling monte carlo simulation water-based acrylic paint |
| url | https://doi.org/10.1515/nanoph-2023-0664 |
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