Thermodynamic optimisation of the performance of a parabolic trough receiver using synthetic oil-Al2O3 nanofluid

Show simple item record Mwesigye, Aggrey Huan, Zhongjie Meyer, Josua P. 2016-02-10T09:15:52Z 2015-10
dc.description.abstract In this paper, results of a thermodynamic analysis using the entropy generation minimisation method for a parabolic trough receiver tube making use of a synthetic oil–Al2O3 nanofluid as a heat transfer fluid are presented. A parabolic trough collector system with a rim angle of 80 and a concentration ratio of 86 was used. The temperature of the nanofluid considered was in the range of 350–600 K. The nanofluid thermal physical properties are temperature dependent. The Reynolds number varies from 3,560 to 1,151,000, depending on the temperature considered and volume fraction of nanoparticles in the base fluid. Nanoparticle volume fractions in the range 0 6 / 6 8% were used. The local entropy generation rates due to fluid flow and heat transfer were determined numerically and used for the thermodynamic analysis. The study shows that using nanofluids improves the thermal efficiency of the receiver by up to 7.6%. There is an optimal Reynolds number at each inlet temperature and volume fraction for which the entropy generated is a minimum. The optimal Reynolds number decreases as the volume fraction increases. There is also a Reynolds number at every inlet temperature and volume fraction beyond which use of nanofluids is thermodynamically undesirable. en_ZA
dc.description.embargo 2016-10-31
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship National Research Foundation (NRF), the Translational Engineering Skills Programme (TESP), Stellenbosch University, the South African National Energy Research Institute (SANERI)/South African National Energy Development Institute (SANEDI) at the University of Pretoria, the Council for Scientific and Industrial Research (CSIR), the Energy-efficiency and Demand-side Management (EEDSM) Hub and NAC. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Mwesigye, A, Huan, Z & Meyer, JP 2015, 'Thermodynamic optimisation of the performance of a parabolic trough receiver using synthetic oil-Al2O3 nanofluid', Applied Energy, vol. 156, pp. 398-412. en_ZA
dc.identifier.issn 0306-2619 (print)
dc.identifier.issn 1872-9118 (online)
dc.identifier.other 10.1016/j.apenergy.2015.07.035
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2015 Elsevier Ltd. All rights reserved. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Applied Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Applied Energy, vol. 156, pp. 398-412, 2015. doi : 10.1016/j.apenergy.2015.07.035. en_ZA
dc.subject Entropy generation en_ZA
dc.subject Nanofluid en_ZA
dc.subject Optimal Reynolds number en_ZA
dc.subject Parabolic trough receiver en_ZA
dc.subject Thermodynamic analysis en_ZA
dc.title Thermodynamic optimisation of the performance of a parabolic trough receiver using synthetic oil-Al2O3 nanofluid en_ZA
dc.type Postprint Article en_ZA

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