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Performance Analysis of Flat-Plate Solar Collector Having Silver IManofluid as a Working Fluid

机译：银纳米流体作为工作液的平板太阳能集热器性能分析

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摘要

A study on water solar collector performance having silver nanofluid as working fluid was carried out. In this study, 20-nm silver particles mixed with water at the concentrations of 1,000 and 10,000 ppm were undertaken in 3 small identical closed-loop flat-plate solar collectors, each with an area of 0.15 m × 1.0 m. The mass flux of the working fluid varied between 0.8 and 1.2 L/min-m~2 and the inlet temperatures were controlled in the range of 35-65℃. The tests were performed outdoor under a steady-state condition. The experimental results showed that at the same Reynolds number, the convective heat transfer coefficient of the nanofluid inside the solar absorber tube at 1,000 ppm was slightly higher than that of water, and at 10,000 ppm, the heat transfer coefficient was about 2 times that of water. This meant that the overall heat loss coefficient of the solar collector with nanofluid could be reduced and more solar heat gain could be obtained, especially with a high inlet temperature of the working fluid. In our experiments,for 10,000 ppm concentration of silver nanoparticles, the optical characteristic and the thermal loss characteristic of the solar collector, under steady-state condition with a mass flux of 1.2 kg/min-m~2, were 0.691 and 4.869 W/m~2-K, compared with 0.684 and 7.178 W/m~2-K, respectively for 1,000 ppm concentration and 0.702 and 8.318 W/m~2-K for water. When the flow rate was different from the standard value, the solar thermal characteristics were also improved with the nanofluid.
机译：以银纳米流体为工作液的太阳能集热器性能进行了研究。在这项研究中，在3个相同的小型闭环平板太阳能收集器中进行了20 nm的银颗粒与1000和10,000 ppm的水混合，每个面积为0.15 m×1.0 m。工作流体的质量通量在0.8至1.2 L / min-m〜2之间变化，入口温度控制在35-65℃范围内。该测试在稳态条件下在室外进行。实验结果表明，在相同的雷诺数下，太阳能吸收器管内的纳米流体的对流传热系数在1,000 ppm时比水略高，而在10,000 ppm时，传热系数约为水的2倍。水。这意味着具有纳米流体的太阳能收集器的总热损失系数可以降低，并且可以获得更多的太阳能热增益，尤其是在工作流体的入口温度较高的情况下。在我们的实验中，对于浓度为10,000 ppm的银纳米粒子，在质量流量为1.2 kg / min-m〜2的稳态条件下，太阳能收集器的光学特性和热损失特性分别为0.691和4.869 W / m〜2-K，而浓度为1,000 ppm时分别为0.684和7.178 W / m〜2-K，水为0.702和8.318 W / m〜2-K。当流速不同于标准值时，纳米流体还改善了太阳热特性。

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  • 来源
    《Heat Transfer Engineering》 |2014年第15期|1183-1191|共9页
  • 作者

    SARAWUT POLVONGSRI; TANONGKIAT KIATSIRIROAT;

  • 作者单位

    Graduate School, Chiang Mai University, Chiang Mai, Thailand;

    Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai, Thailand 50200;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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