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A dual-layer polymer-based film for all-day sub-ambient radiative sky cooling

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  • Liu, Jie
  • Xu, Chengfeng
  • Ao, Xianze
  • Lu, Kegui
  • Zhao, Bin
  • Pei, Gang

Abstract

Radiative sky cooling (RSC) is a promising eco-friendly technique that requires no energy input for sub-ambient cooling. A radiative cooler with high solar reflection and strong thermal emission is the key to achieving sub-ambient cooling effect. Recently, polymer-based coolers have attracted much attention due to their excellent radiative properties and flexibility. Herein, the parasitic absorption of functional groups is applied to select polymer materials for radiative cooling, and a dual-layer film consisting of ethylene-tetra-fluoro-ethylene (ETFE) film and silver layer is fabricated for all-day sub-ambient RSC. Optical characterization shows that the fabricated ETFE cooler exhibits a high AM1.5 spectra-weighed solar reflectivity of 94% and has an average emissivity of nearly 0.83 in the atmospheric window (i.e.,8–13 μm). Besides, thermal performance tests reveal that the cooler's temperature is on average 3.0 °C lower than ambient air during daytime in Hefei, and is approximately 1.6 °C below ambient air even at noon. Additionally, the thermal performance prediction also indicates that the ETFE cooler is a good candidate for sub-ambient RSC.

Suggested Citation

  • Liu, Jie & Xu, Chengfeng & Ao, Xianze & Lu, Kegui & Zhao, Bin & Pei, Gang, 2022. "A dual-layer polymer-based film for all-day sub-ambient radiative sky cooling," Energy, Elsevier, vol. 254(PA).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pa:s0360544222012531
    DOI: 10.1016/j.energy.2022.124350
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    References listed on IDEAS

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    1. Anna Castaldo & Giuseppe Vitiello & Emilia Gambale & Michela Lanchi & Manuela Ferrara & Michele Zinzi, 2020. "Mirroring Solar Radiation Emitting Heat Toward the Universe: Design, Production, and Preliminary Testing of a Metamaterial Based Daytime Passive Radiative Cooler," Energies, MDPI, vol. 13(16), pages 1-16, August.
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    3. Steven Chu & Arun Majumdar, 2012. "Opportunities and challenges for a sustainable energy future," Nature, Nature, vol. 488(7411), pages 294-303, August.
    4. Zhao, Bin & Hu, Mingke & Ao, Xianze & Chen, Nuo & Pei, Gang, 2019. "Radiative cooling: A review of fundamentals, materials, applications, and prospects," Applied Energy, Elsevier, vol. 236(C), pages 489-513.
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    Cited by:

    1. Zhaoyi Zhuang & Yanbiao Xu & Qian Wu & Bing Liu & Bowen Li & Jin Zhao & Xuebin Yang, 2022. "Experimental Study on the Performance of a Space Radiation Cooling System under Different Environmental Factors," Energies, MDPI, vol. 15(19), pages 1-18, October.
    2. Zhao, Bin & Liu, Jie & Hu, Mingke & Ao, Xianze & Li, Lanxin & Xuan, Qingdong & Pei, Gang, 2023. "Performance analysis of a broadband selective absorber/emitter for hybrid utilization of solar thermal and radiative cooling," Renewable Energy, Elsevier, vol. 205(C), pages 763-771.
    3. Lv, Song & Zhang, Bolong & Ji, Yishuang & Ren, Juwen & Yang, Jiahao & Lai, Yin & Chang, Zhihao, 2023. "Comprehensive research on a high performance solar and radiative cooling driving thermoelectric generator system with concentration for passive power generation," Energy, Elsevier, vol. 275(C).
    4. Wang, Cun-Hai & Chen, Hao & Jiang, Ze-Yi & Zhang, Xin-Xin & Wang, Fu-Qiang, 2023. "Modelling and performance evaluation of a novel passive thermoelectric system based on radiative cooling and solar heating for 24-hour power-generation," Applied Energy, Elsevier, vol. 331(C).
    5. Dong, Yan & Zhang, Xinping & Chen, Lingling & Meng, Weifeng & Wang, Cunhai & Cheng, Ziming & Liang, Huaxu & Wang, Fuqiang, 2023. "Progress in passive daytime radiative cooling: A review from optical mechanism, performance test, and application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).

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