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Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems
Dissertation (MEng)--University of Pretoria, 2013.
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| Format: | Thesis |
| Language: | Eng |
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University of Pretoria
2013
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| _version_ | 1867613553186308096 |
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| access_status_str | Open Access |
| author2 | Bello-Ochende, Tunde |
| author_browse | Bello-Ochende, Tunde |
| author_facet | Bello-Ochende, Tunde |
| collection | Thesis |
| dc_rights_str_mv | © 2013, 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, 2013. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/31615 |
| institution | University of Pretoria (South Africa) |
| language | Eng |
| last_indexed | 2026-06-10T12:37:58.345Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| 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:2263/31615 Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems Bello-Ochende, Tunde u04407482@tuks.co.za Meyer, Josua P. Yekoladio, Peni Junior Geothermal energy Optimization Organic rankine cycles Exergy analysis Entropy generation minimization analysis Binary cycle Enhanced geothermal system. UCTD Dissertation (MEng)--University of Pretoria, 2013. The present work addresses the thermodynamic optimization of small binary-cycle geothermal power plants. The optimization process and entropy generation minimization analysis were performed to minimize the overall exergy loss of the power plant, and the irreversibilities associated with heat transfer and fluid friction caused by the system components. The effect of the geothermal resource temperature to impact on the cycle power output was studied, and it was found that the maximum cycle power output increases exponentially with the geothermal resource temperature. In addition, an optimal turbine inlet temperature was determined, and observed to increase almost linearly with the increase in the geothermal heat source. Furthermore, a coaxial geothermal heat exchanger was modeled and sized for minimum pumping power and maximum extracted heat energy. The geofluid circulation flow rate was also optimized, subject to a nearly linear increase in geothermal gradient. In both limits of the fully turbulent and laminar fully-developed flows, a nearly identical diameter ratio of the coaxial pipes was determined irrespective of the flow regime, whereas the optimal geofluid mass flow rate increased exponentially with the Reynolds number. SeveORCs were observed to yield maximum cycle power output. The addition of an IHE and/or an Oral organic Rankine Cycles were also considered as part of the study. The basic types of the FOH improved significantly the effectiveness of the conversion of the available geothermal energy into useful work, and increased the thermal efficiency of the geothermal power plant. Therefore, the regenerative ORCs were preferred for high-grade geothermal heat. In addition, a performance analysis of several organic fluids was conducted under saturation temperature and subcritical pressure operating conditions of the turbine. Organic fluids with higher boiling point temperature, such as n-pentane, were recommended for the basic type of ORCs, whereas those with lower vapour specific heat capacity, such as butane, were more suitable for the regenerative ORCs. Mechanical and Aeronautical Engineering unrestricted 2013-09-10T07:01:57Z 2013 2013-09-10T07:01:57Z 2013 2013 2013-07-08 Dissertation Yekoladio, P. 2013, Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/31615> C13/9/1022 http://hdl.handle.net/2263/31615 Eng © 2013, 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 | Geothermal energy Optimization Organic rankine cycles Exergy analysis Entropy generation minimization analysis Binary cycle Enhanced geothermal system. UCTD Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems |
| title | Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems |
| title_full | Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems |
| title_fullStr | Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems |
| title_full_unstemmed | Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems |
| title_short | Thermodynamic optimization of sustainable energy system : application to the optimal design of heat exchangers for geothermal power systems |
| title_sort | thermodynamic optimization of sustainable energy system application to the optimal design of heat exchangers for geothermal power systems |
| topic | Geothermal energy Optimization Organic rankine cycles Exergy analysis Entropy generation minimization analysis Binary cycle Enhanced geothermal system. UCTD |
| url | http://hdl.handle.net/2263/31615 |