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

Iranmanesh, S; Silakhori, M; Naghavi, MS; Ang, BC; Ong, HC; Esmaeilzadeh, A

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

Iranmanesh, S Silakhori, M Naghavi, MS Ang, BC Ong, HC Esmaeilzadeh, A

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Publisher:: MDPI AG
Publication Type:: Journal Article
Citation:: Journal of Composites Science, 2021, 5, (10), pp. 1-14
Issue Date:: 2021-10-01

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Field	Value	Language
dc.contributor.author	Iranmanesh, S
dc.contributor.author	Silakhori, M
dc.contributor.author	Naghavi, MS
dc.contributor.author	Ang, BC
dc.contributor.author	Ong, HC
dc.contributor.author	Esmaeilzadeh, A
dc.date.accessioned	2022-06-06T01:50:37Z
dc.date.available	2022-06-06T01:50:37Z
dc.date.issued	2021-10-01
dc.identifier.citation	Journal of Composites Science, 2021, 5, (10), pp. 1-14
dc.identifier.issn	2504-477X
dc.identifier.issn	2504-477X
dc.identifier.uri	http://hdl.handle.net/10453/157958
dc.description.abstract	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.
dc.language	en
dc.publisher	MDPI AG
dc.relation.ispartof	Journal of Composites Science
dc.relation.isbasedon	10.3390/jcs5100277
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Using graphene nanoplatelets nanofluid in a closed-loop evacuated tube solar collector—energy and exergy analysis
dc.type	Journal Article
utslib.citation.volume	5
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
utslib.copyright.status	open_access	*
pubs.consider-herdc	false
dc.date.updated	2022-06-06T01:50:32Z
pubs.issue	10
pubs.publication-status	Published
pubs.volume	5
utslib.citation.issue	10

Abstract:

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.

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http://hdl.handle.net/10453/157958