Enhanced radiative cooling with Janus optical properties for low-temperature space cooling

Meng Yang; Yijun Zeng; Qingyuan Du; Haoyang Sun; Yingying Yin; Xiantong Yan; Mengnan Jiang; Chin Pan; Dazhi Sun; Zuankai Wang

doi:10.1515/nanoph-2023-0641

Enhanced radiative cooling with Janus optical properties for low-temperature space cooling

Meng Yang, Yijun Zeng, Qingyuan Du, Haoyang Sun, Yingying Yin, Xiantong Yan, Mengnan Jiang, Chin Pan, Dazhi Sun^*, Zuankai Wang^*

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

13 Citations (Scopus)

90 Downloads (CityUHK Scholars)

Abstract

Passive daytime radiative cooling that could provide sub-ambient cooling emerges as a promising technology to reduce household energy consumption. Nonetheless, prevailing studies are predominantly focused on surface cooling, often overlooking its adaptability to enclosed spaces with active cooling technologies. Here we present a multilayer radiative cooling film (J-MRC) with Janus optical properties in the mid-infrared region, consisting of the nanoporous polyethylene films, the polyethylene oxide film, and silver nanowires. The top side of the J-MRC functions as a conventional radiative cooling material to supply subambient surface cooling, while the bottom side with low mid-infrared emissivity transfers limited heat via thermal radiation to the low-temperature enclosures. Our experiments validate that the J-MRC possesses an enhanced space cooling performance in comparison to the conventional radiative cooling film. This work provides a valuable design concept for radiative cooling materials, thereby expanding their practical scenarios and contributing to reduce the carbon emission.

© 2023 the author(s), published by De Gruyter

Original language	English
Pages (from-to)	629-637
Journal	Nanophotonics
Volume	13
Issue number	5
Online published	15 Jan 2024
DOIs	https://doi.org/10.1515/nanoph-2023-0641
Publication status	Published - Mar 2024

Bibliographical note

Research Unit(s) information for this publication is provided by the author(s) concerned.

Funding

This work was supported by Guangdong Provincial Key Laboratory Program (2021B1212040001) from the Department of Science and Technology of Guangdong Province, the Research Grants Council of Hong Kong (no. B-QC0R), and Meituan Green Tech Fund.

Research Keywords

radiative cooling
Janus optical property
electrospinning
surface cooling
Space cooling

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

RGC Funding Information

RGC-funded

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abstract = "Passive daytime radiative cooling that could provide sub-ambient cooling emerges as a promising technology to reduce household energy consumption. Nonetheless, prevailing studies are predominantly focused on surface cooling, often overlooking its adaptability to enclosed spaces with active cooling technologies. Here we present a multilayer radiative cooling film (J-MRC) with Janus optical properties in the mid-infrared region, consisting of the nanoporous polyethylene films, the polyethylene oxide film, and silver nanowires. The top side of the J-MRC functions as a conventional radiative cooling material to supply subambient surface cooling, while the bottom side with low mid-infrared emissivity transfers limited heat via thermal radiation to the low-temperature enclosures. Our experiments validate that the J-MRC possesses an enhanced space cooling performance in comparison to the conventional radiative cooling film. This work provides a valuable design concept for radiative cooling materials, thereby expanding their practical scenarios and contributing to reduce the carbon emission.{\textcopyright} 2023 the author(s), published by De Gruyter",

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AU - Yang, Meng

AU - Zeng, Yijun

AU - Du, Qingyuan

AU - Sun, Haoyang

AU - Yin, Yingying

AU - Yan, Xiantong

AU - Jiang, Mengnan

AU - Pan, Chin

AU - Sun, Dazhi

AU - Wang, Zuankai

N1 - Research Unit(s) information for this publication is provided by the author(s) concerned.

PY - 2024/3

Y1 - 2024/3

N2 - Passive daytime radiative cooling that could provide sub-ambient cooling emerges as a promising technology to reduce household energy consumption. Nonetheless, prevailing studies are predominantly focused on surface cooling, often overlooking its adaptability to enclosed spaces with active cooling technologies. Here we present a multilayer radiative cooling film (J-MRC) with Janus optical properties in the mid-infrared region, consisting of the nanoporous polyethylene films, the polyethylene oxide film, and silver nanowires. The top side of the J-MRC functions as a conventional radiative cooling material to supply subambient surface cooling, while the bottom side with low mid-infrared emissivity transfers limited heat via thermal radiation to the low-temperature enclosures. Our experiments validate that the J-MRC possesses an enhanced space cooling performance in comparison to the conventional radiative cooling film. This work provides a valuable design concept for radiative cooling materials, thereby expanding their practical scenarios and contributing to reduce the carbon emission.© 2023 the author(s), published by De Gruyter

AB - Passive daytime radiative cooling that could provide sub-ambient cooling emerges as a promising technology to reduce household energy consumption. Nonetheless, prevailing studies are predominantly focused on surface cooling, often overlooking its adaptability to enclosed spaces with active cooling technologies. Here we present a multilayer radiative cooling film (J-MRC) with Janus optical properties in the mid-infrared region, consisting of the nanoporous polyethylene films, the polyethylene oxide film, and silver nanowires. The top side of the J-MRC functions as a conventional radiative cooling material to supply subambient surface cooling, while the bottom side with low mid-infrared emissivity transfers limited heat via thermal radiation to the low-temperature enclosures. Our experiments validate that the J-MRC possesses an enhanced space cooling performance in comparison to the conventional radiative cooling film. This work provides a valuable design concept for radiative cooling materials, thereby expanding their practical scenarios and contributing to reduce the carbon emission.© 2023 the author(s), published by De Gruyter

KW - radiative cooling

KW - Janus optical property

KW - electrospinning

KW - surface cooling

KW - Space cooling

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Enhanced radiative cooling with Janus optical properties for low-temperature space cooling

Abstract

Bibliographical note

Funding

Research Keywords

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RGC Funding Information

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