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An experimental and numerical investigation on a paraffin wax/graphene oxide/carbon nanotubes composite material for solar thermal storage applications

机译:用于太阳能蓄热应用的石蜡/石墨烯氧化物/碳纳米管复合材料的实验性和数值研究

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摘要

In this study, a composite phase change material (PCM) with hybrid graphene aerogel (HGA) composed of graphene oxide (GO) and carbon nanotubes (CNTs), as well as paraffin wax (PW) is prepared. In the composite PCM, the graphene aerogel plays a role as a skeletal structure to seal the PW, and provides more pathways for thermal conduction. The CNTs perform as extended surface on the skeletal structure for a further improvement of the thermal conductivity. The prepared composite PCM with 2.2 wt% of HGA exhibits a thermal conductivity as high as 0.46 W m(-1) K-1, 1.77-fold higher than that of pure PW (0.26 W m(-1) K-1), and 1.44-fold higher than the PW/GA composite PCM. At the same time, the prepared composite PCM also possesses a large solar absorptance (close to 1) in the solar spectrum, which is 1.4-fold higher than that of pure PW. In addition, owing to the low density of HGA, the composite PCM reveals a comparable heat storage performance as compared to pure PW. In addition, the feasibility of composite PCMs in a solar thermal storage system is modelled and studied by numerical simulation. The results indicate that the numerical model could predict the solar thermal storage process accurately. The PW/G2C1-CA solar unglazed collector shows good performance in terms of large solar energy storage and short charging/discharging durations.
机译:在该研究中,制备具有由石墨烯(GO)和碳纳米管(CNT)组成的混合石墨烯气体(HGA)的复合相变材料(PCM)以及石蜡(PW)。在复合PCM中,石墨烯Airgel起到骨骼结构的作用,以密封PW,并提供更多的热传导途径。 CNT在骨架结构上以延伸表面执行,以进一步提高导热率。具有2.2wt%HGA的制备的复合PCM表现出高达0.46WM(-1)k-1,比纯PW(0.26WM(-1)K-1)高1.77倍的导热率,比PW / GA复合PCM高1.44倍。同时,制备的复合PCM在太阳光谱中具有大的太阳能吸收率(接近1),比纯PW高1.4倍。另外,由于HGA的低密度,复合PCM与纯PW相比,揭示了可比的热存储性能。此外,通过数值模拟建模和研究了太阳能热存储系统中复合PCM的可行性。结果表明,数值模型可以准确地预测太阳能储存过程。 PW / G2C1-CA太阳能未氮化收集器在大型太阳能储能和短充电/放电持续时间方面表现出良好的性能。

著录项

  • 来源
    《Applied Energy》 |2020年第15期|114786.1-114786.14|共14页
  • 作者单位

    Dalian Univ Technol Key Lab Ocean Energy Utilizat & Energy Conservat Minist Educ Dalian 116024 Peoples R China;

    Dalian Univ Technol Key Lab Ocean Energy Utilizat & Energy Conservat Minist Educ Dalian 116024 Peoples R China;

    Dalian Univ Technol Key Lab Ocean Energy Utilizat & Energy Conservat Minist Educ Dalian 116024 Peoples R China;

    Dalian Univ Technol Sch Phys Dalian 116024 Liaoning Peoples R China;

    Dalian Univ Technol Key Lab Ocean Energy Utilizat & Energy Conservat Minist Educ Dalian 116024 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Solar thermal storage; PCMs; Graphene aerogel; CNTs;

    机译:太阳能热存储;PCM;石墨烯气凝胶;CNT;

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