Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating
While passive radiative cooling has shown great potential in temperate regions in lowering surface temperatures, its cooling performance under tropical climate that is characterised by high solar irradiance and humidity still lacks exploration. Herein, we adopt a highly reflective polymeric coating...
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sg-ntu-dr.10356-1572112022-05-10T07:22:01Z Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating Han, Di Fei, Jipeng Mandal, Jyotirmoy Liu, Zhixin Li, Hong Raman, Aaswath P. Ng, Bing Feng School of Mechanical and Aerospace Engineering Engineering::Materials::Functional materials Engineering::Mechanical engineering::Alternative, renewable energy sources Engineering::Mechanical engineering Sub-Ambient Radiative Cooling Polymeric Coating While passive radiative cooling has shown great potential in temperate regions in lowering surface temperatures, its cooling performance under tropical climate that is characterised by high solar irradiance and humidity still lacks exploration. Herein, we adopt a highly reflective polymeric coating with BaSO4 particles dispersed in P(VdF-HFP) matrix for radiative cooling in the tropics. Through the strong Mie scattering of sunlight and intrinsic bond vibration, the substrate-independent average solar reflectance and infrared emittance within the 8–13 μm atmospheric window could reach 97% and 94.2%, respectively. For the first time, surfaces could maintain sub-ambient temperatures under direct exposure to the sky and surroundings even when the solar intensity was 1000 W/m2 and downwelling atmospheric radiation was 480 W/m2, while separately achieving 2 °C below ambient during night-time with an effective cooling power of 54.4 W/m2. With a scalable fabrication-process, our cost-effective single-layer coating can be easily applied to diverse substrates, which is suitable for real-world applications in the tropics. Ministry of Education (MOE) Published version This study was funded by the Singapore Ministry of Education through grant no. 2018-T1-001-070. 2022-05-10T07:22:01Z 2022-05-10T07:22:01Z 2022 Journal Article Han, D., Fei, J., Mandal, J., Liu, Z., Li, H., Raman, A. P. & Ng, B. F. (2022). Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating. Solar Energy Materials and Solar Cells, 240, 111723-. https://dx.doi.org/10.1016/j.solmat.2022.111723 0927-0248 https://hdl.handle.net/10356/157211 10.1016/j.solmat.2022.111723 2-s2.0-85127072706 240 111723 en 2018-T1-001-070 Solar Energy Materials and Solar Cells © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/). application/pdf |
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Engineering::Materials::Functional materials Engineering::Mechanical engineering::Alternative, renewable energy sources Engineering::Mechanical engineering Sub-Ambient Radiative Cooling Polymeric Coating Han, Di Fei, Jipeng Mandal, Jyotirmoy Liu, Zhixin Li, Hong Raman, Aaswath P. Ng, Bing Feng Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating |
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While passive radiative cooling has shown great potential in temperate regions in lowering surface temperatures, its cooling performance under tropical climate that is characterised by high solar irradiance and humidity still lacks exploration. Herein, we adopt a highly reflective polymeric coating with BaSO4 particles dispersed in P(VdF-HFP) matrix for radiative cooling in the tropics. Through the strong Mie scattering of sunlight and intrinsic bond vibration, the substrate-independent average solar reflectance and infrared emittance within the 8–13 μm atmospheric window could reach 97% and 94.2%, respectively. For the first time, surfaces could maintain sub-ambient temperatures under direct exposure to the sky and surroundings even when the solar intensity was 1000 W/m2 and downwelling atmospheric radiation was 480 W/m2, while separately achieving 2 °C below ambient during night-time with an effective cooling power of 54.4 W/m2. With a scalable fabrication-process, our cost-effective single-layer coating can be easily applied to diverse substrates, which is suitable for real-world applications in the tropics. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Han, Di Fei, Jipeng Mandal, Jyotirmoy Liu, Zhixin Li, Hong Raman, Aaswath P. Ng, Bing Feng |
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Article |
author |
Han, Di Fei, Jipeng Mandal, Jyotirmoy Liu, Zhixin Li, Hong Raman, Aaswath P. Ng, Bing Feng |
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Han, Di |
title |
Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating |
title_short |
Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating |
title_full |
Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating |
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Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating |
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Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating |
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sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating |
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2022 |
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https://hdl.handle.net/10356/157211 |
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1734310196636811264 |