Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling

Passive daytime radiative cooling (PDRC) involves spontaneously cooling a surface by reflecting sunlight and radiating heat to the cold outer space. Current PDRC designs are promising alternatives to electrical cooling but are either inefficient or have limited applicability. We present a simple, in...

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Published in:Science (American Association for the Advancement of Science) 2018-10, Vol.362 (6412), p.315-319
Main Authors: Mandal, Jyotirmoy, Fu, Yanke, Overvig, Adam C, Jia, Mingxin, Sun, Kerui, Shi, Norman N, Zhou, Hua, Xiao, Xianghui, Yu, Nanfang, Yang, Yuan
Format: Article
Language:English
Subjects:
Air conditioners
Air conditioning
Climate Control
Cooling
Daytime
Durability
Fluorides
MATERIALS SCIENCE
Polymer coatings
Protective coatings
Roofs
Substrates
Temperature
Vinylidene
Vinylidene fluoride
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cited_by cdi_FETCH-LOGICAL-c498t-2d09f25c11fd30a2e124d7d1d12fe0dcd3d8afaee2851217ed22b0020606d55a3
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container_title Science (American Association for the Advancement of Science)
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creator Mandal, Jyotirmoy
Fu, Yanke
Overvig, Adam C
Jia, Mingxin
Sun, Kerui
Shi, Norman N
Zhou, Hua
Xiao, Xianghui
Yu, Nanfang
Yang, Yuan
description Passive daytime radiative cooling (PDRC) involves spontaneously cooling a surface by reflecting sunlight and radiating heat to the cold outer space. Current PDRC designs are promising alternatives to electrical cooling but are either inefficient or have limited applicability. We present a simple, inexpensive, and scalable phase inversion-based method for fabricating hierarchically porous poly(vinylidene fluoride-co-hexafluoropropene) [P(VdF-HFP) ] coatings with excellent PDRC capability. High, substrate-independent hemispherical solar reflectances (0.96 ± 0.03) and long-wave infrared emittances (0.97 ± 0.02) allow for subambient temperature drops of ~6°C and cooling powers of ~96 watts per square meter (W m ) under solar intensities of 890 and 750 W m , respectively. The performance equals or surpasses those of state-of-the-art PDRC designs, and the technique offers a paint-like simplicity.
doi_str_mv 10.1126/science.aat9513
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subjects Air conditioners
Air conditioning
Climate Control
Cooling
Daytime
Durability
Fluorides
MATERIALS SCIENCE
Polymer coatings
Protective coatings
Roofs
Substrates
Temperature
Vinylidene
Vinylidene fluoride
title Hierarchically porous polymer coatings for highly efficient passive daytime radiative cooling
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