Scientific Results

Graphite/diamond ethylene glycol-nanofluids for solar energy applications

Year: 2018

Authors: Sani E., Papi N., Mercatelli L., Zyla G.

Autors Affiliation: CNR-INO National Institute of Optics, Largo E. Fermi, 6, I-50125, Firenze, Italy; Department of Physics and Medical Engineering, Rzeszow University of Technology, 35-905, Rzeszow, Poland

Abstract: The rapid development of thermodynamic solar systems requires increasingly efficient absorption materials. This work reports on the investigation of light-intensity dependent optical properties of graphite/nanodiamond suspensions in ethylene glycol, in the perspective to evaluate their potential for direct absorption solar collectors and solar vapor generation. The study was carried out two sample types, differing in the ash content (0.3% and 5.9% wt in the powder), and at three concentrations each (0.0025%, 0.0050%, 0.0100% wt in the fluid). A high sunlight extinction was found, with full absorption in 15mm and 30mm path lengths for the 0.0100% and 0.0050% wt concentrations, respectively. This makes
investigated nanofluids appealing as volumetric direct solar absorbers in solar collectors. Moreover, by characterizing optical properties at high incident intensities, we proved the creation of vapor bubbles in the base fluid via optical limiting effects active at least from ultraviolet to near infrared wavelengths. This result propose graphite/nanodiamond-based suspensions for sunlight-induced vapor generation application as well. © 2018 Elsevier Ltd. All rights reserved.

Journal/Review: RENEWABLE ENERGY

Volume: 126      Pages from: 692  to: 698

More Information: This research was carried out under the auspices of EU COST Action CA15119: Overcoming Barriers to Nanofluids Market Uptake ( NANOUPTAKE ). The Italian bank foundation “Fondazione Ente Cassa di Risparmio di Firenze” is gratefully acknowledged for supporting a part of this activity within the framework of the SOLE-NANO project (pratica n. 2015.0861). Thanks are due to Mr. M. D
KeyWords: Carbon; Graphite; Nanodiamond; Nanofluids; Optical limiting; Optical properties; Solar energy
DOI: 10.1016/j.renene.2018.03.078

Citations: 32
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