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Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect
Dissertation (MSc)--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_ | 1867613674750869504 |
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| access_status_str | Open Access |
| author2 | Sharifpur, Mohsen |
| author_browse | Sharifpur, Mohsen |
| author_facet | Sharifpur, Mohsen |
| 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 (MSc)--University of Pretoria, 2016. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/61300 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:54.561Z |
| 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:2263/61300 Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect Sharifpur, Mohsen u11279185@tuks.co.za Meyer, Josua P. Katamba, Kanwayi Gaettan UCTD Waste heat recovery Thermal efficiency Rankine cycle Global warming Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Dissertation (MSc)--University of Pretoria, 2016. In most previous studies that have been conducted on converting waste heat energy from exhaust gases into useful energy, the engine waste heat recovery system has been placed along the exhaust flow pipe where the temperature differs from the temperature just behind the exhaust valves. This means that an important fraction of the energy from the exhaust gases is still lost to the environment. The present work investigates the potential thermodynamic analysis of an integrated exhaust waste heat recovery (EWHR) system based on a Rankine cycle on an engine's exhaust manifold. The amount of lost energy contained in the exhaust gases at the exhaust manifold level, at average temperatures of 500 °C and 350 °C (for petrol and diesel), and the thermodynamic composition of these gases were determined. For heat to occur, a temperature difference (between the exhaust gas and the working fluid) at the pinch point of 20°C was considered. A thermodynamic analysis was performed on different configurations of EWHR thermal efficiencies and the selected suitable working fluids. The environmental and economic aspects of the integrated EWHR system just behind the exhaust valves of an internal combustion engine (ICE) were analysed. Among all working fluids that were used when the thermodynamic analysis was performed, water was selected as the best working fluid due to its higher thermal efficiency, availability, low cost and environmentally friendly characteristics. Using the typical engine data, results showed that almost 29.54% of exhaust waste heat can be converted. This results in better engine efficiency and fuel consumption on a global scale by gaining an average of 1 114.98 Mb and 1 126.63 Mb of petrol and diesel respectively from 2020 to 2040. It can combat global warming by recovering 56.78 1 011 MJ and 64.65 1 011 MJ of heat rejected from petrol and diesel engines, respectively. A case study of a Volkswagen Citi Golf 1.3i is considered, as it is a popular vehicle in South Africa. This idea can be applied to new-design hybrid vehicles that can use the waste heat to charge the batteries when the engine operates on fossil fuel. mi2025 Mechanical and Aeronautical Engineering MSc Unrestricted SDG-07: Affordable and clean energy SDG-13: Climate action SDG-12: Responsible consumption and production 2017-07-13T13:28:49Z 2017-07-13T13:28:49Z 2017-04-26 2016 Dissertation Katamba, KG 2016, Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/61300> A2017 http://hdl.handle.net/2263/61300 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 Waste heat recovery Thermal efficiency Rankine cycle Global warming Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect |
| title | Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect |
| title_full | Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect |
| title_fullStr | Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect |
| title_full_unstemmed | Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect |
| title_short | Investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect |
| title_sort | investigation into waste heat to work in thermal systems in order to gain more efficiency and less environmental defect |
| topic | UCTD Waste heat recovery Thermal efficiency Rankine cycle Global warming Engineering, built environment and information technology theses SDG-07 SDG-07: Affordable and clean energy Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action Engineering, built environment and information technology theses SDG-12 SDG-12: Responsible consumption and production |
| url | http://hdl.handle.net/2263/61300 |