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Stability investigation of propylene glycol-based Ag@SiO2 nanofluids and their performance in spectral splitting photovoltaic/thermal systems
Energy ( IF 9 ) Pub Date : 2021-09-13 , DOI: 10.1016/j.energy.2021.122040
Xiaobo Zhao 1 , Xinyue Han 1 , Yiping Yao 1 , Ju Huang 1
Affiliation  

One main challenge facing nanofluid filters in PV/T systems is their long-term dispersion stability. This work studies the stability of the Ag@SiO2 nanoparticles suspended in propylene glycol (PG)-based fluids for use as optical filters. These nanofluid filters are subjected to high temperature heating test and thermal cycling test to analyze their thermal stability and identify appropriate base fluids. The results of UV-Vis spectroscopy and visual inspection show that both the most concentrated Ag@SiO2/PG+water nanofluid and Ag@SiO2/PG nanofluid exhibit excellent thermal stability when heated to 95°C and 120°C, respectively and no agglomeration is observed for exposure to thermal cycling test. A theoretical model with the measured transmittance of the identified Ag@SiO2 nanofluids as the input is introduced to evaluate performance of the nanofluid filtered PV/T system by varying the nanoparticles concentration, optical path-length and concentration ratio. The results indicate that Ag@SiO2/PG+water filter and Ag@SiO2/PG filter for PV/T systems using silicon cells show the capability to increase the economic value of more than 30% at optimum nanoparticles concentration of 12.7 mg/L and optical path-length of 35 mm and 40 mm, respectively, when the concentration ratio varies from 1 to 30 suns.



中文翻译:

丙二醇基Ag@SiO2纳米流体的稳定性研究及其在光谱分裂光伏/热系统中的性能

PV/T 系统中纳米流体过滤器面临的一项主要挑战是它们的长期分散稳定性。这项工作研究了悬浮在丙二醇 (PG) 基流体中用作滤光片的 Ag@SiO 2纳米颗粒的稳定性。这些纳米流体过滤器经过高温加热测试和热循环测试,以分析其热稳定性并确定合适的基础流体。UV-Vis 光谱和目视检查结果表明,浓度最高的 Ag@SiO 2 /PG+水纳米流体和 Ag@SiO 2/PG 纳米流体在分别加热至 95°C 和 120°C 时表现出优异的热稳定性,并且在暴露于热循环测试中未观察到团聚。引入以已识别的 Ag@SiO 2纳米流体的测量透射率作为输入的理论模型,通过改变纳米粒子浓度、光程长度和浓度比来评估纳米流体过滤 PV/T 系统的性能。结果表明Ag@SiO 2 /PG+水过滤器和Ag@SiO 2用于使用硅电池的 PV/T 系统的 /PG 过滤器显示,在 12.7 mg/L 的最佳纳米颗粒浓度和 35 mm 和 40 mm 的光程长度下,能够将经济价值提高 30% 以上。比率从 1 到 30 太阳不等。

更新日期:2021-09-13
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