Functionalized graphene nanoplatelet-nanofluids for solar thermal collectors

Year: 2018

Authors: Sani E., Vallejo J.P., Cabaleiro D., Lugo L.

Autors Affiliation: CNR INO Natl Inst Opt, Largo E Fermi 6, I-50125 Florence, Italy; Univ Vigo, Fac Ciencias, Dept Fis Aplicada, E-36310 Vigo, Spain; CNR ITC Ist Tecnol Costruz, I-35127 Padua, Italy.

Abstract: This work reports on the characterization of new heat transfer fluids consisting in dispersions of functionalized graphene nanoplatelets (fGnP) in Havoline XLC Premixed 50/50 base fluid. Optical, stability and rheological properties have been considered, with the aim to assess the nano-suspension potential for volumetric direct solar absorbers. Nanoparticle addition leads to a considerably higher sunlight absorption with respect to the pure base fluid even at the investigated extremely low concentrations (0.005% and 0.05% wt). Rheology tests show a Newtonian behaviour in the shear rate range between 10 and 1000 s(-1). Viscosity and thermal conductivities do not significantly increase with respect to the pure base fluid, showing that these new fluids will not require additional pumping powers to flow.

Journal/Review: SOLAR ENERGY MATERIALS AND SOLAR CELLS

Volume: 185      Pages from: 205  to: 209

More Information: This work was partially supported by Ministerio de Economia y Competitividad (Spain) and FEDER program through ENE2014-55489-C2-2-R and ENE2017-86425-C2-1-R projects. Research was also partially supported by EU COST Action CA15119 (NANOUPTAKE). Authors also acknowledge Nanoinnova Technologies S.L. (www.nanoinnova.com) for providing the functionalized graphene nanoplatelets powder. J. P. V. acknowledges FPI Program of Ministerio de Economia y Competitividad. D.C. thanks Xunta de Galicia for a postdoctoral fellowship.
KeyWords: Graphene; Heat transfer; Nanofluidics; Optical properties; Suspensions (fluids); Thermal conductivity; Viscosity, Dynamic viscosities; Functionalized graphene; Low concentrations; Nanofluids; Nanoparticle addition; Newtonian behaviours; Rheological property; Solar thermal collector, Solar absorbers
DOI: 10.1016/j.solmat.2018.05.038

Citations: 81
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