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Carbon black nanofluid synthesis for use in concentrated solar power applications
Dissertation (MEng)--University of Pretoria, 2016.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2017
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| _version_ | 1867613654057222144 |
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| access_status_str | Open Access |
| author2 | Badenhorst, Heinrich |
| author_browse | Badenhorst, Heinrich |
| author_facet | Badenhorst, Heinrich |
| collection | Thesis |
| dc_rights_str_mv | © 2017 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2016. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/61346 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:34.803Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/61346 Carbon black nanofluid synthesis for use in concentrated solar power applications Badenhorst, Heinrich u11035103@tuks.co.za Bester, Johan Jochemus Gildenhuys UCTD Nanofluid Carbon black Concentrated solar power Direct absorption solar collector Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-07 Engineering, built environment and information technology theses SDG-12 Dissertation (MEng)--University of Pretoria, 2016. Direct absorption solar collectors offer possible improvement in efficiency over traditional surface absorbing collectors, because they have fewer heat transfer steps and has the ability to utilise higher radiation fluxes. Carbon black based nanofluids, in a base fluid of salt water, were synthesised by a two-step method where the carbon black nanoparticles were treated with a surfactant, TWEEN-20, in a 1:2 mass ratio and sonicated for 60 minutes to break up agglomerates. The synthesised nanofluids showed stability for over 31 days. The different carbon black concentration nanofluids' solar irradiation absorption properties were compared with each other and with the base fluid of salt water in a concentrating, as well as non-concentration scenario. It was found that the carbon black nanofluids showed excellent absorption properties over the entire solar radiation spectrum. A 1 m2 concentrating unit using a two-axis tracking system, with two mirrors and a 1 m diameter circular Fresnel lens, was used to concentrate solar radiation on a direct absorption solar collector flow cell with a 10 cm2 collection area. An optimum concentration of 0.001 volume % carbon black was found to show a 42 % increase in heating rate, compared to that of salt water. The collector was, however, hampered by high energy losses and the maximum collector efficiency achieved was only 46 %, 23 % higher than that of salt water. The overall system efficiency was only 22 %. This low efficiency can be attributed to the high optical concentration losses (50 % - 70 %) present in the concentrating unit. mi2026 Chemical Engineering MEng Unrestricted SDG-07: Affordable and clean energy SDG-09: Industry, innovation and infrastructure SDG-12: Responsible consumption and production 2017-07-13T13:29:02Z 2017-07-13T13:29:02Z 2017-04-20 2016 Dissertation Bester, JJG 2016, Carbon blacknano fluid synthesis for use in concentrated solar power applications, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/61346> A2017 http://hdl.handle.net/2263/61346 en © 2017 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Nanofluid Carbon black Concentrated solar power Direct absorption solar collector Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-07 Engineering, built environment and information technology theses SDG-12 Carbon black nanofluid synthesis for use in concentrated solar power applications |
| title | Carbon black nanofluid synthesis for use in concentrated solar power applications |
| title_full | Carbon black nanofluid synthesis for use in concentrated solar power applications |
| title_fullStr | Carbon black nanofluid synthesis for use in concentrated solar power applications |
| title_full_unstemmed | Carbon black nanofluid synthesis for use in concentrated solar power applications |
| title_short | Carbon black nanofluid synthesis for use in concentrated solar power applications |
| title_sort | carbon black nanofluid synthesis for use in concentrated solar power applications |
| topic | UCTD Nanofluid Carbon black Concentrated solar power Direct absorption solar collector Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-07 Engineering, built environment and information technology theses SDG-12 |
| url | http://hdl.handle.net/2263/61346 |