THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Omer Khalil Ahmed

,

Shaimaa Mohammed Bawa

THE COMBINED EFFECT OF NANOFLUID AND REFLECTIVE MIRRORS ON THE PERFORMANCE OF PHOTOVOLTAIC/THERMAL SOLAR COLLECTOR

ABSTRACT
A photovoltaic thermal (PV/T) solar collector is a system which is capable of producing both electricity and thermal energy; however this technology still needs more studies. In this paper, a mathematical model was presented to study the performance of a PV/Thermal collector by using the upper and lower reflectors with the presence of glass cover. Water and nanofluids (AL2O3-H2O) were used as cooling medium. A computer program was proposed to calculate the amount of solar radiation reflected on the reflected mirrors and then absorbed by the hybrid collector and study the effect of Nano-fluid on the performance of the system. Solar radiation absorbed by the collector can be increased using the upper and lower reflectors to 1138 W/m2 while it can reach 950 W/m2 with the upper reflector and 746 W/m2 with the lower reflector. It was noticed that when using reflective mirrors, the outlet water temperature increased by 21.7%. Meanwhile, the outlet water temperature increased by 0.44% when nanofluid was used as a cooling medium. The average of daily thermal efficiency as a result of using two reflectors without nanofluid was 62.1%, while the thermal efficiency was 59.735 % without using any reflector, meaning a positive effect of using reflectors on the thermal efficiency. The electrical efficiency reduced with the existence of the reflective mirrors, whereas the daily average of the total electrical efficiency without the reflective mirror and using the nanofluid was (14.6 %), while with a reflective mirror and using nanofluid, the daily average was (13.67 %).
KEYWORDS
PV/Thermal collector, nanofluid, reflective mirrors, performance
PAPER SUBMITTED: 2017-12-03
PAPER REVISED: 2018-01-29
PAPER ACCEPTED: 2018-02-01
PUBLISHED ONLINE: 2018-03-04
DOI REFERENCE: https://doi.org/10.2298/TSCI171203092A
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 2, PAGES [573 - 587]
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The combined effect of nanofluid and reflective mirrors on the performance of photovoltaic/thermal solar collector

© 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