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Title: Sub-ambient radiative cooling under tropical climate using highly reflective polymeric coating
Authors: Han, Di
Fei, Jipeng
Mandal, Jyotirmoy
Liu, Zhixin
Li, Hong
Raman, Aaswath P.
Ng, Bing Feng
Keywords: Engineering::Materials::Functional materials
Engineering::Mechanical engineering::Alternative, renewable energy sources
Engineering::Mechanical engineering
Issue Date: 2022
Source: 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-.
Project: 2018-T1-001-070
Journal: Solar Energy Materials and Solar Cells
Abstract: 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.
ISSN: 0927-0248
DOI: 10.1016/j.solmat.2022.111723
Rights: © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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