Using graphene nanoplatelets nanofluid in a closed-loop evacuated tube solar collector-energy and exergy analysis

Iranmanesh, Soudeh and Silakhori, Mahyar and Naghavi, Mohammad Sajad and Ang, Bee Chin and Ong, Hwai C. and Esmaeilzadeh, Alireza (2021) Using graphene nanoplatelets nanofluid in a closed-loop evacuated tube solar collector-energy and exergy analysis. Journal of Composites Science, 5 (10). ISSN 2504-477X, DOI

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Recently, nanofluid application as a heat transfer fluid for a closed-loop solar heat collector is receiving great attention among the scientific community due to better performance. The performance of solar systems can be assessed effectively with the exergy method. The present study deals with the thermodynamic performance of the second law analysis using graphene nanoplatelets nanofluids. Second law analysis is the main tool for explaining the exergy output of thermodynamic and energy systems. The performance of the closed-loop system in terms of energy and exergy was determined by analyzing the outcome of field tests in tropical weather conditions. Moreover, three parameters of entropy generation, pumping power and Bejan number were also determined. The flowrates of 0.5, 1 and 1.5 L/min and GNP mass percentage of 0.025, 0.5, 0.075 and 0.1 wt% were used for these tests. The results showed that in a flow rate of 1.5 L/min and a concentration of 0.1 wt%, exergy and thermal efficiencies were increased to about 85.5 and 90.7%, respectively. It also found that entropy generation reduced when increasing the nanofluid concentration. The Bejan number surges up when increasing the concentration, while this number decreases with the enhancement of the volumetric flow rate. The pumping power of the nanofluid-operated system for a 0.1 wt% particle concentration at 0.5 L/min indicated 5.8% more than when pure water was used as the heat transfer fluid. Finally, this investigation reveals the perfect conditions that operate closest to the reversible limit and helps the system make the best improvement.</p>

Item Type: Article
Uncontrolled Keywords: Exergy; Entropy; Graphene; Thermal energy; Nanoplatelets; Nanofluid
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering > Department of Civil Engineering
Faculty of Engineering > Department of Mechanical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 07 Sep 2022 02:22
Last Modified: 07 Sep 2022 02:22

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