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A direct absorption solar collector based on a water-ethylene glycol based nanofluid with anti-freeze property and excellent dispersion stability

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  • Xu, Xinxin
  • Xu, Chao
  • Liu, Jian
  • Fang, Xiaoming
  • Zhang, Zhengguo

Abstract

Herein a direct absorption solar collector (DASC) with the reduced graphene oxide (RGO)/water-ethylene glycol (EG) nanofluid as the working fluid was firstly explored. The RGO/water-EG nanofluid was prepared from a GO/water-EG nanofluid at a loading of 0.06% via the UV irradiation for 240 s. It is shown that the zeta potential of the RGO/water-EG nanofluid increases with temperature, suggesting its excellent dispersion stability at elevated temperatures. The base liquid consisting EG and water endows the nanofluid with anti-freeze property, making its DASC can be applied in cold weather. The RGO/water-EG nanofluid exhibited better optical absorption property and thermal conductivity than the previously reported RGO/water nanofluid. After being exposed under a solar intensity of 1000 W/m2 for 6000 s, the temperature increase of RGO/water-EG nanofluid increases by 76.9% and the receiver efficiency increases by 70%, as compared to the base fluid. These good characteristics make RGO/water-EG nanofluid promising working fluid for DASCs. Consequently, a numerical simulation was employed to study the DASC based on the nanofluid with the liquid heights varying from 2 to 10 cm. It is revealed that the DASC based on the RGO/water-EG nanofluid exhibits good photo-thermal conversion performance and receiver efficiency, thus showing great potential in practical applications.

Suggested Citation

  • Xu, Xinxin & Xu, Chao & Liu, Jian & Fang, Xiaoming & Zhang, Zhengguo, 2019. "A direct absorption solar collector based on a water-ethylene glycol based nanofluid with anti-freeze property and excellent dispersion stability," Renewable Energy, Elsevier, vol. 133(C), pages 760-769.
    • Handle: RePEc:eee:renene:v:133:y:2019:i:c:p:760-769
    DOI: 10.1016/j.renene.2018.10.073
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    References listed on IDEAS

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    1. Liu, Jian & Wang, Fuxian & Zhang, Long & Fang, Xiaoming & Zhang, Zhengguo, 2014. "Thermodynamic properties and thermal stability of ionic liquid-based nanofluids containing graphene as advanced heat transfer fluids for medium-to-high-temperature applications," Renewable Energy, Elsevier, vol. 63(C), pages 519-523.
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    Cited by:

    1. Li, Zhijing & Lei, Hui & Kan, Ankang & Xie, Huaqing & Yu, Wei, 2021. "Photothermal applications based on graphene and its derivatives: A state-of-the-art review," Energy, Elsevier, vol. 216(C).
    2. Chen, Zhanxiu & Zheng, Dan & Wang, Jin & Chen, Lei & Sundén, Bengt, 2020. "Experimental investigation on heat transfer characteristics of various nanofluids in an indoor electric heater," Renewable Energy, Elsevier, vol. 147(P1), pages 1011-1018.

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