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Experimental investigation on photothermal properties of nanofluids for direct absorption solar thermal energy systems

机译：直接吸收太阳能热能系统纳米流体光热特性的实验研究

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摘要

In this article, Cu-H_2O nanofluids were prepared through two-step method. The transmittance of nanofluids over solar spectrum (250-2500 nm) was measured by the UV-Vis-NIR spectrophotometer based on integrating sphere principle. The factors influencing transmittance of nanofluids, such as particle size, mass fraction and optical path were investigated. The extinction coefficients measured experimentally were compared with the theoretical calculation value. Meanwhile, the photothermal properties of nanofluids were also investigated. The experimental results show that the transmittance of Cu-H_2O nanofluids is much less than that of deionized water, and decreases with increasing nanoparticle size, mass fraction and optical depth. The highest temperature of Cu-H_2O nanofluids (0.1 wt.%) can increased up to 25.3% compared with deionized water. The good absorption ability of Cu-H_2O nanofluids for solar energy indicates that it is suitable for direct absorption solar thermal energy systems.
机译：本文通过两步法制备了Cu-H_2O纳米流体。基于积分球原理，通过UV-Vis-NIR分光光度计测量了纳米流体在太阳光谱（250-2500 nm）上的透射率。研究了影响纳米流体透过率的因素，如粒径，质量分数和光路。将实验测得的消光系数与理论计算值进行比较。同时，还研究了纳米流体的光热性质。实验结果表明，Cu-H_2O纳米流体的透射率远小于去离子水，并且随着纳米颗粒尺寸，质量分数和光学深度的增加而降低。与去离子水相比，Cu-H_2O纳米流体的最高温度（0.1 wt。％）可以提高到25.3％。 Cu-H_2O纳米流体对太阳能的良好吸收能力表明它适用于直接吸收太阳能热能系统。

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  • 来源
    《Energy Conversion & Management》 |2013年第9期|150-157|共8页
  • 作者

    Qinbo He; Shuangfeng Wang; Shequan Zeng; Zhaozhi Zheng;

  • 作者单位

    Key Lab of Enhanced Heat Transfer and Energy Conservation, The Ministry of Education, South China University of Technology, Guangzhou 510641,China,Guangdong University Heat Pump Engineering Technology Development Center, Shunde Polytechnic, Foshan, Guangdong 528333, China;

    Key Lab of Enhanced Heat Transfer and Energy Conservation, The Ministry of Education, South China University of Technology, Guangzhou 510641,China;

    Key Lab of Enhanced Heat Transfer and Energy Conservation, The Ministry of Education, South China University of Technology, Guangzhou 510641,China;

    Guangdong University Heat Pump Engineering Technology Development Center, Shunde Polytechnic, Foshan, Guangdong 528333, 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

    Nanofluids; Solar energy; Photothermal properties; Transmittance; Extinction coefficients;

    机译：纳米流体;太阳能;光热性能;透光率消光系数;

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