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Research Papers

Olive Leaf-Synthesized Nanofluids for Solar Parabolic Trough Collector—Thermal Performance Evaluation

[+] Author and Article Information
Eric C. Okonkwo

Department of Energy Systems Engineering,
Faculty of Engineering,
Cyprus International University,
Mersin 10,
Lefkosa, North-Cyprus 99258, Turkey
e-mail: echekwube@ciu.edu.tr

Edidiong A. Essien

Department of Environmental Science,
Cyprus International University,
Mersin 10,
Nicosia, Northern Cyprus 99258, Turkey

Doga Kavaz

Department of Bio-engineering,
Faculty of Engineering,
Cyprus International University,
Mersin 10,
Nicosia, Northern Cyprus 99258, Turkey

Muhammad Abid

Department of Energy Systems Engineering,
Faculty of Engineering,
Cyprus International University,
Mersin 10,
Lefkosa, Northern Cyprus 99258, Turkey

Tahir A. H. Ratlamwala

Department of Engineering Sciences,
National University of Sciences and Technology,
Islamabad 75350, Pakistan

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received February 2, 2019; final manuscript received May 15, 2019; published online June 17, 2019. Assoc. Editor: Ali J. Chamkha.

J. Thermal Sci. Eng. Appl 11(4), 041009 (Jun 17, 2019) (13 pages) Paper No: TSEA-19-1052; doi: 10.1115/1.4043820 History: Received February 02, 2019; Revised May 15, 2019

This study presents a novel performance evaluation of the commercially available LS-2 collector operating with an oil-based olive leaf-synthesized nanofluid. The nanoparticles were synthesized experimentally from olive leaf extracts (OLEs): OLE-ZVI and OLE-TiO2. The thermophysical properties of the nanoparticles were then added to Syltherm-800 thermal oil, and its performance on the parabolic trough solar collector (PTC) was evaluated numerically. The PTC under study was modeled on the engineering equation solver (EES) and validated thermally with results found in the literature. The synthesized nanoparticles were also found to possess anticorrosion properties, nontoxic, and less expensive to produce when compared to commercially available ones. The use of the nanofluids (Syltherm-800/OLE-ZVI and Syltherm-800/OLE-TiO2) was evaluated against the parameters of thermal and exergetic efficiencies, heat transfer coefficient, thermal losses, and pressure drop. The study shows that an enhancement in thermal performance of 0.51% and 0.48% was achieved by using Syltherm-800/OLE-ZVI and Syltherm-800/OLE-TiO2 nanofluids, respectively. A heat transfer coefficient enhancement of 42.9% and 51.2% was also observed for Syltherm-800/OLE-TiO2 and Syltherm-800/OLE-ZVI nanofluids, respectively. Also, a mean variation in pressure drop of 11.5% was observed by using the nanofluids at a nanoparticle volumetric concentration of 3%. A comparison of the results of this study with related literature shows that the proposed nanofluids outperform those found in literature.

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Figures

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Fig. 1

Parabolic trough collector system

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Fig. 2

Experimental setup for the OLE nanoparticle preparation: (a) olive leaves after washing and drying, (b) crushed olive leaves, (c) aqueous OLE, (d) homogenizer, (e-1) liquid OLE-ZVI, (e-2) liquid OLE-TiO2, (f) particles of OLE-ZVI, and (g) particles of OLE-TiO2

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Fig. 3

SEM images of the synthesized: (a) OLE-ZVI and (b) OLE-TiO2 nanoparticles

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Fig. 4

Energy-dispersive X-ray spectroscopy graphs for: (a) OL-ZVI and (b) OLE-TiO2 nanoparticles

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Fig. 5

Thermal model validation for (a) thermal efficiency and (b) outlet temperature

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Fig. 6

An evaluation of the density and dynamic viscosity of the nanofluids

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Fig. 7

An evaluation of the specific heat capacity and thermal conductivity of the nanofluids

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Fig. 8

Effect of inlet temperature on the thermal efficiency and heat transfer performance of the working fluids

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Fig. 9

Exergy efficiency and pressure drop performance of the working fluids

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Fig. 10

Effect of volumetric flow rate on the thermal efficiency and pressure losses of the working fluids at a temperature of 400 K

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Fig. 11

Effect of volumetric flow rate on the exergy efficiency and heat transfer coefficient of the working fluids

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Fig. 12

Effect of volumetric flow rate on the thermal losses and Nusselt number of the working fluids

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