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EXPERIMENTAL INVESTIGATION OF USING GRAPHENE NANOPLATELETS AND HYBRID NANOFLUID AS COOLANT IN PHOTOVOLTAIC THERMAL SYSTEMS

ABSTRACT
It is a common observation that the photovoltaic (PV) panel shows a compromised performance when its temperature rises. To handle the performance reduction, most PV panels are equipped with a thermal absorber for removing the solar cells’ excessive heat with the help of a heat transfer fluid. The mentioned thermal absorber system is termed as PV thermal or simply PV/T. This study aims to experimentally investigate the effects of a graphene nanoplatelets nanofluid, distilled water, and hybrid nanofluid as transfer fluids in PV/T collectors. A hybrid nanofluid comprises Al2O3 and graphene nanoplatelets. An outdoor experimental set-up was installed and tested under the climatic conditions in Karabuk, Turkey, to measure the inlet as well as outlet PV/T fluid temperatures, ambient temperature with solar radiation, and surface temperatures of both PV/T collector and the PV panel. The mass percentage of the coolant fluids was 0.5% (by weight) and their flow rate was 0.5 Lpm. Results show that the graphene nanoplatelets nanofluid is the most effective fluid because it showed superior thermal efficiency among all the tested fluids. Adding a thermal unit to the PV/T unit increased the overall energy efficiency by 48.4%, 52%, and 56.1% using distilled water, hybrid nanofluid, and graphene nanofluid, respectively
KEYWORDS
PAPER SUBMITTED: 2020-05-24
PAPER REVISED: 2020-11-12
PAPER ACCEPTED: 2020-12-02
PUBLISHED ONLINE: 2021-01-02
DOI REFERENCE: https://doi.org/10.2298/TSCI200524348A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 1, PAGES [195 - 208]
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© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence