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Graphite/diamond ethylene glycol-nanofluids for solar energy applications
Renewable Energy ( IF 8.7 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.renene.2018.03.078
Elisa Sani , Nicolò Papi , Luca Mercatelli , Gaweł Żyła

Abstract The rapid development of thermodynamic solar systems requires increasingly efficient absorption materials. This work reports on the investigation of light-intensity dependent optical properties of graphite/nanodiamond suspensions in ethylene glycol, in the perspective to evaluate their potential for direct absorption solar collectors and solar vapor generation. The study was carried out two sample types, differing in the ash content (0.3% and 5.9% wt in the powder), and at three concentrations each (0.0025%, 0.0050%, 0.0100% wt in the fluid). A high sunlight extinction was found, with full absorption in 15 mm and 30 mm path lengths for the 0.0100% and 0.0050% wt concentrations, respectively. This makes investigated nanofluids appealing as volumetric direct solar absorbers in solar collectors. Moreover, by characterizing optical properties at high incident intensities, we proved the creation of vapor bubbles in the base fluid via optical limiting effects active at least from ultraviolet to near infrared wavelengths. This result propose graphite/nanodiamond-based suspensions for sunlight-induced vapor generation application as well.

中文翻译:

用于太阳能应用的石墨/金刚石乙二醇纳米流体

摘要 热力学太阳能系统的快速发展需要越来越高效的吸收材料。这项工作报告了对乙二醇中石墨/纳米金刚石悬浮液的光强相关光学特性的研究,以评估它们在直接吸收太阳能集热器和太阳能蒸汽产生方面的潜力。该研究采用两种样品类型,不同的灰分含量(粉末中的重量为 0.3% 和 5.9%),每种样品的三种浓度(流体中的重量为 0.0025%、0.0050%、0.0100%)。发现高太阳光消光,分别在 0.0100% 和 0.0050% wt 浓度下完全吸收 15 mm 和 30 mm 路径长度。这使得所研究的纳米流体作为太阳能收集器中的体积直接太阳能吸收器很有吸引力。而且,通过表征高入射强度下的光学特性,我们证明了通过至少从紫外到近红外波长有效的光学限制效应在基液中产生蒸汽泡。该结果提出了基于石墨/纳米金刚石的悬浮液也可用于阳光诱导的蒸汽发生应用。
更新日期:2018-10-01
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