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Enhancement of photo-thermal conversion using gold nanofluids with different particle sizes

机译：使用具有不同粒径的金纳米流体增强光热转化

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摘要

This work describes an experimental study of the particle size dependence of gold nanofluids during photo-thermal conversion in a direct absorption solar collector (DASC). Au nanoparticles (NPs) with different sizes were synthesized using a seed mediated method. Au NPs play a significant role in enhancing the solar light absorption with respect to a pure base fluid at a very low concentration due to the localized surface plasmon resonance effect. Experimental results of the photo-thermal conversion showed that the photo-thermal conversion efficiency of Au nanofluids obtained an average enhancement of 19.9% and 21.3% for a cube shaped DASC and a flat shaped DASC, respectively, compared with H2O at a relatively low mass fraction (similar to 0.000008% weight). Reducing the Au NP size led to the enhancement of the photo-thermal conversion efficiency under the present experimental conditions, which could be an effective way for the. modification of optical properties and thermodynamic characteristics. However, the size of Au NPs did not significantly influence the efficiency for the cube shaped DASC. The cube shaped DASC model usually had the higher efficiency than the flat DASC model using the same working fluids since the heat loss percentage of the cube shaped DASC was lower. (C) 2016 Elsevier Ltd. All rights reserved.
机译：这项工作描述了在直接吸收式太阳能收集器（DASC）中光热转化过程中金纳米流体的粒度依赖性实验研究。使用种子介导的方法合成了具有不同大小的Au纳米颗粒（NPs）。由于局部表面等离子体激元共振效应，Au NPs在非常低的浓度下对纯碱流体增强太阳光吸收起着重要作用。光热转化的实验结果表明，与质量相对较低的H2O相比，立方体形DASC和扁平形DASC的Au纳米流体的光热转化效率分别平均提高了19.9％和21.3％。分数（类似于0.000008％的重量）。减小Au NP尺寸导致在当前实验条件下光热转化效率的提高，这可能是一种有效的方法。修改光学特性和热力学特性。但是，金纳米颗粒的大小并没有显着影响立方体DASC的效率。立方形状的DASC模型通常比使用相同工作流体的平面DASC模型具有更高的效率，因为立方形状的DASC的热损失百分比较低。 （C）2016 Elsevier Ltd.保留所有权利。

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