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Bio-inspired effective and regenerable building cooling using tough hydrogels

Author

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  • Cui, Shuang
  • Ahn, Chihyung
  • Wingert, Matthew C.
  • Leung, David
  • Cai, Shengqiang
  • Chen, Renkun

Abstract

Innovative thermal regulation technologies could provide great potential for reducing energy consumption in buildings. In this work, we report, for the first time, the application of highly stretchable and tough double network hydrogels (DN-Gels) as durable and reusable ‘sweating skins’ for cooling buildings. These DN-Gels demonstrate outstanding cooling performance, reducing the top roof surface temperature of wooden house models by 25–30°C for up to 7h after only a single water hydration charge. More importantly, compared with single network hydrogels (SN-Gels) previously studied for cooling applications, these DN-Gels exhibit extraordinary toughness and cyclability due to their interpenetrated ionically and covalently cross-linked networks, as demonstrated by constant cooling performance over more than 50 cycles. This excellent cyclability is further demonstrated by the unaltered mechanical properties and charging capability of the hydrogels after many cycles, compared to fresh ones. By coating a 100m2 roof of a single house with tough DN-Gels, it is estimated that the annual electricity consumption needed for air conditioning can be reduced by ∼290kWh with associated CO2 emission reductions of 160kg. Our results suggest that bio-inspired sweat cooling, specifically using tough DN-Gel coatings, represents a promising energy-efficient technology for cooling buildings as well as other devices and systems.

Suggested Citation

  • 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.
  • Handle: RePEc:eee:appene:v:168:y:2016:i:c:p:332-339
    DOI: 10.1016/j.apenergy.2016.01.058
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    1. Al-Obaidi, Karam M. & Azzam Ismail, Muhammad & Hussein, Hazreena & Abdul Rahman, Abdul Malik, 2017. "Biomimetic building skins: An adaptive approach," Renewable and Sustainable Energy Reviews, Elsevier, vol. 79(C), pages 1472-1491.
    2. Fang, Hong & Zhao, Dongliang & Yuan, Jinchao & Aili, Ablimit & Yin, Xiaobo & Yang, Ronggui & Tan, Gang, 2019. "Performance evaluation of a metamaterial-based new cool roof using improved Roof Thermal Transfer Value model," Applied Energy, Elsevier, vol. 248(C), pages 589-599.
    3. Wu, Nan & Ye, Xiaolin & Li, Junjie & Lin, Boshen & Zhou, Xuelong & Yu, Bin, 2021. "Passive thermal management systems employing hydrogel for the large-format lithium-ion cell: A systematic study," Energy, Elsevier, vol. 231(C).
    4. 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).

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