Scientific Results

Functionalized graphene nanoplatelet-nanofluids for solar thermal collectors

Year: 2018

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

Autors Affiliation: [Sani, Elisa] CNR INO Natl Inst Opt, Largo E Fermi 6, I-50125 Florence, Italy; [Vallejo, Javier P.; Cabaleiro, David; Lugo, Luis] Univ Vigo, Fac Ciencias, Dept Fis Aplicada, E-36310 Vigo, Spain; [Cabaleiro, David] 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 Economía 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 Economía 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: 68
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