Enhancement of Photo-Thermal Conversion Performance of the Nanofluids Through Spectral Complementarity between Silver an
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https://doi.org/10.1007/s11630-020-1306-2
Article ID: 1003-2169(2020)00-0000-00
Enhancement of Photo-Thermal Conversion Performance of the Nanofluids Through Spectral Complementarity between Silver and Cesium Tungstate Oxide Nanoparticles LIU Changqing1,2, ZHANG Liye3, HE Yan4,*, YU Wei3,* 1. School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China 2. Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing, Shaoyang University, Shaoyang 422000, China 3. College of Engineering, Shanghai Polytechnic University, Shanghai 201209, China 4. School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: Nanofluids with full-spectrum absorption properties are highly desirable for direct solar thermal energy conversion applications. In this work, Ag and CsWO3 nanofluids, which exhibit absorption both in the visible and near-infrared (NIR) region, are integrated to obtain two-component hybrid nanofluids. The hybrid nanofluids show broad band absorption with a solar weighted absorption fraction of 99.6%, compared to 18% and 54% for the base liquid (ethylene glycol) and CsWO3 nanofluids, respectively. The highest photo-thermal conversion performance for the hybrid nanofluids is obtained with Ag/CsWO3 weight ratio of 3/7. The solar thermal conversion efficiency of the optimum hybrid nanofluids is 67%, 10% and 15% higher than single Ag and CsWO3 nanofluids. The two-component hybrid nanofluid provides an alternative for making the best use of solar energy.
Keywords: photo-thermal conversion, nanofluids, Ag, cesium tungsten oxide, near-infrared
1. Introduction Solar energy, as one of the most abundant and clean energy sources, has attracted extensive attention in the past few decades. Many fields like photovoltaic [1], photochemical [2,3] and photo-thermal [4,5] can see its utilization. Among them, photo-thermal conversion based on nanofluids is one of the most significant practical approaches to utilize solar energy. Nanofluids, were proposed and first used by Choi [6,7] for absorbing the sunlight and converting light energy to Received: Jun 09, 2019 AE: MAHIAN Omid
heat energy [8,9]. Over the past two decades since the proposition of the concept “nanofluids”, a new kind of nanofluids containing metal nanoparticles such as Au, Ag, Pt, Cu has aroused a hot research boom, which is based on the localized surface plasmon resonance (LSPR) effect induced by matching the vibrational frequencies of metal nanoparticles with the incident photon frequencies [10–12]. For instance, gold nanoparticles (GNP) [13] increase the photo-thermal conversion efficiency of the base fluid by 20% at a lowest examined mass concentration of 0.15×10−6 when the plasmon peak of
Corresponding author: HE Yan; YU Wei
E-mail: [email protected] [email protected] www.springerlink.com
2
GNP is around 520 nm. S
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