Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
PHOTOTHERMAL CONVERSION USING GRAPHENE/WATER NANOFLUIDS
Submission Author:
Carolina Beicker , MG
Co-Authors:
Carolina Beicker, ENIO PEDONE BANDARRA FILHO
Presenter: Carolina Beicker
doi://10.26678/ABCM.COBEM2017.COB17-1426
Abstract
The dispersion of particles in the nanometer range - 1 to 100 nm - in a liquid medium, known as nanofluids, has been shown by several authors as an optimization alternative for conventional solar absorption systems and heat transfer systems due to its unique properties. The present study experimentally investigated the behavior of Graphene/Water nanofluids under realistic conditions of photothermal conversion using direct absorption solar collector (DASC). Nanofluids at low volumetric concentrations – 1 to 300ppm - were obtained by dilution and sonication process. An apparatus was built for the simultaneous exposure of different concentrations of nanofluids and the base fluid to solar radiation without any solar concentrating device. The results showed that nanoparticles have excellent photo-thermal conversion capacity, even at low concentrations, however, the Specific Absorption Rate (SAR) decreased with nanoparticle’s addition to the base fluid. After ten hours of testing, the samples showed agglomeration and precipitation problems, a challenge for future applications.
Keywords
Nanofluids, graphene, DASC, Photothermal conversion
