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Superhydrophobic waste paper-based aerogel as a thermal insulating cooler for building

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  • Yue, Xuejie
  • Wu, Hai
  • Zhang, Tao
  • Yang, Dongya
  • Qiu, Fengxian

Abstract

Daytime subambient radiative cooling is a most promising alternative to electricity-free building cooling. However, optical performance degradation arising from surface contamination and inevitable parasitic heat gain still pose unprecedented challenges to cool building at subambient temperatures. This paper proposed a superhydrophobic cellulose aerogel cooler (SHB-CAC) as building envelope by integrating self-cleaning capacity, passive daytime radiative cooling and thermal insulation to reduce environmental heat gain. The SHB-CAC demonstrates high solar reflectance (93%) and long-wave infrared emittance (91%), accomplishing a temperature drop of 8.5 °C lower than the ambient under sunlight of 800 W/m2 in the outdoor experiment. Notably, the SHB-CAC possesses low thermal conductivity (28 mW/(m∙K)) that suppresses parasitic heat gain from warmer surrounding and reduces cooling energy consumption. The self-cleaning property resulting from superhydrophobicity protects SHB-CAC from water wetting and dust contamination but also maintains its good surface radiation capacities under different humidity environment. A building energy simulation was conducted and results showed that 43.4% of cooling energy on average could be saved compared to the building baseline consumption, if SHB-CAC was widely used in China, indicating that the strategy of optical and thermal conductivity management of cooler has the potential to reduce the energy consumption of buildings.

Suggested Citation

  • Yue, Xuejie & Wu, Hai & Zhang, Tao & Yang, Dongya & Qiu, Fengxian, 2022. "Superhydrophobic waste paper-based aerogel as a thermal insulating cooler for building," Energy, Elsevier, vol. 245(C).
  • Handle: RePEc:eee:energy:v:245:y:2022:i:c:s0360544222001906
    DOI: 10.1016/j.energy.2022.123287
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    References listed on IDEAS

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    1. Vall, Sergi & Castell, Albert, 2017. "Radiative cooling as low-grade energy source: A literature review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 77(C), pages 803-820.
    2. Cui, Shuang & Ahn, Chihyung & Wingert, Matthew C. & Leung, David & Cai, Shengqiang & Chen, Renkun, 2016. "Bio-inspired effective and regenerable building cooling using tough hydrogels," Applied Energy, Elsevier, vol. 168(C), pages 332-339.
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    Cited by:

    1. Angeliki Kitsopoulou & Evangelos Bellos & Christos Tzivanidis, 2024. "An Up-to-Date Review of Passive Building Envelope Technologies for Sustainable Design," Energies, MDPI, vol. 17(16), pages 1-55, August.
    2. Jiang, Kaiyu & Zhang, Kai & Shi, Zijie & Li, Haoran & Wu, Bingyang & Mahian, Omid & Zhu, Yutong, 2023. "Experimental and numerical study on the potential of a new radiative cooling paint boosted by SiO2 microparticles for energy saving," Energy, Elsevier, vol. 283(C).
    3. Xie, Xing & Xu, Bin & Cheng, Yuan-xia & Pei, Gang, 2023. "New method of integrating experiment for maintaining low indoor temperature into numerical modelling: A feasibility demonstration in reduced-scale building model," Energy, Elsevier, vol. 284(C).
    4. Chen, Xing-ni & Xu, Bin & Fei, Yue & Pei, Gang, 2024. "Combination optimization, importance order of parameters and aging consequence prediction for thermal insulation coating with radiation characteristics," Energy, Elsevier, vol. 290(C).

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