The influence of mixing water on the thermophysical properties of nanofluids based on solar salt and silica nanoparticles
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2016-05-31
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AMER INST PHYSICS, 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
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Abstract
The use of nanofluids (NFs) based on Solar Salt (SS) and nanoparticles (NPs), either as Thermal Energy Storage (TES) material or as Heat Transfer Fluid (HTF), is attracting great interest in recent years. Many authors [1,3] have reported important improvements on the thermophysical properties (specific heat capacity cp,thermal conductivity k) of NFs based on SS and ceramic NPs. These improvements would lead to important savings and better performance of TES facilities on new Concentrated Solar Power (CSP) plants due to lower quantities of material required and smaller storage tanks. To achieve these advantageous features in the final NFs, it is essential to avoid NP agglomeration during their preparation. Different synthesis procedures have been reported: mixing of solid NPs within a SS solution by means of ultrasounds [1-3], direct mixing of solid NPs and molten salt [4]. In this work, NFs based on SS and 1% by wt. of silica NPs were synthetized from a SS-water solution and a commercial water-silica NF called Ludox HS 30% (Sigma-Aldrich). The influence of the mixing water volume (MW) on the cp of NFs was evaluated. With this aim, the cp of these samples was measured by Differential Scanning Calorimetry (DSC) both in the solid and the liquid state. In addition, the distribution of sizes was measured during the whole preparation process by Dynamic Light Scattering (DLS). Further information about sizes and uniformity of the final NFs was obtained from Scanning Electron Microscopy (SEM) images. X-ray Diffraction (XRD) patterns of the SS and final NF were performed.
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Publisher Copyright: © 2016 Author(s).
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heat capacity , molten salt , nanofluid , solar energy , thermal energy storage , heat capacity , molten salt , nanofluid , solar energy , thermal energy storage , General Physics and Astronomy , SDG 7 - Affordable and Clean Energy , Funding Info , Basque Government's ETORTEK 2014 , Basque Government's ETORTEK 2014
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Muñoz-Sánchez , B , Nieto-Maestre , J , Iparraguirre-Torres , I , Sanchez-Garcia , J A , Julia , J E & García-Romero , A 2016 , The influence of mixing water on the thermophysical properties of nanofluids based on solar salt and silica nanoparticles . in V Rajpaul & C Richter (eds) , unknown : International Conference on Concentrating Solar Power and Chemical Energy Systems . 0094-243X , AMER INST PHYSICS, 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA , 21st International Conference on Concentrating Solar Power and Chemical Energy Systems, SolarPACES 2015 , Cape Town , South Africa , 13/10/15 . https://doi.org/10.1063/1.4949129
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