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Synthesis and characterization of nanofluids useful in concentrated solar power plants produced by new mixing methodologies for large-scale production

[+] Author and Article Information
Manila Chieruzzi

University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima, 4 - 05100 Terni, Italy
manila.chieruzzi@unipg.it

Adio Miliozzi

ENEA - Italian National Agency for New Technologies, Energy and Sustainable Economic Development Casaccia Research Centre, Via Anguillarese, 301 - 00123 S. Maria di Galeria, Rome, Italy
adio.miliozzi@enea.it

Tommaso Crescenzi

ENEA - Italian National Agency for New Technologies, Energy and Sustainable Economic Development Casaccia Research Centre, Via Anguillarese, 301 - 00123 S. Maria di Galeria, Rome, Italy
tommaso.crescenzi@enea.it

José M Kenny

University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima, 4 - 05100 Terni, Italy
jose.kenny@unipg.it

Luigi Torre

University of Perugia, Civil and Environmental Engineering Department, UdR INSTM, Strada di Pentima, 4 - 05100 Terni, Italy
luigi.torre@unipg.it

1Corresponding author.

ASME doi:10.1115/1.4038415 History: Received January 29, 2017; Revised September 07, 2017

Abstract

In this study different nanofluids were developed by mixing a molten salt mixture (60% NaNO3-40% KNO3) with 1.0 wt.% of silica-alumina nanoparticles using different methods. New mixing procedures without sonication were introduced with the aim to avoid the sonication step and to allow the production of a greater amount of nanofluid with a procedure potentially more suitable for large-scale productions. For this purpose, two mechanical mixers and a magnetic stirrer were used. Each nanofluid was prepared in aqueous solution with a concentration of 100g/l. The effect of different concentrations (300g/l and 500g/l) was also studied with the most effective mixer. Specific heat, melting temperature and latent heat were measured by means of Differential Scanning Calorimeter (DSC). Thermal conductivity in the solid state was also evaluated. The results show that the highest increase of the specific heat was obtained with 100 g/l both in solid (up to 31%) and in liquid phase (up to 14%) with the two mechanical mixers. The same nanofluids also showed higher amount of stored heat. An increase in thermal conductivity and diffusivity was also detected for high solution concentrations with a maximum of 25% and 47% respectively. SEM and EDX revealed a smaller grain size in the nanofluids respect to salt mixture. A better nanoparticles distribution is achieved with the lowest concentration. Nanofluids with enhanced thermal properties can be synthesized in a cost-effective form in high concentrated aqueous solutions by using mechanical mixers.

Copyright (c) 2017 by ASME
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