Viability assessment of enhancing dry cooling systems using thermal storage ponds
| dc.contributor.advisor | Malan, A G | en_ZA |
| dc.contributor.advisor | Pretorius, J P | en_ZA |
| dc.contributor.author | Gosai, Priyesh | en_ZA |
| dc.date.accessioned | 2014-11-05T03:50:33Z | |
| dc.date.available | 2014-11-05T03:50:33Z | |
| dc.date.issued | 2014 | en_ZA |
| dc.description | Includes bibliographical references | en_ZA |
| dc.description.abstract | Dry cooled systems are employed to reject heat in modern power plants. Unfortunately, these cooling systems become less effective under windy conditions and when ambient temperatures are high. One proposed solution to this problem is to augment the cooling capacity of the dry cooled system by means of utilizing evaporative cooling ponds which can be operated in parallel during adverse ambient conditions. This study investigates a concept for a South African power station. The system utilises waste-water from evaporation ponds which will supply a surface condenser connected in parallel to the dry cooled system. The development of this system requires an accurate model to predict the transient thermal response of the pond. No such pond model is available in open literature due to the pond under consideration having a unique size as well as size to depth ratio. Various heat transfer modes are numerically modelled for large evaporation ponds, including free surface evaporation which is a transient and complex phenomenon. Evaporation at the surface is the primary heat and only mass transfer driver. The modified Ryan equation proposed by an experimentally validated study was used to estimate evaporation on the surface. Convection is modelled using a correlation that was derived and experimentally tested for applications in the natural environment. Heat transfer via conduction to the ground is solved using a one dimensional finite difference solution to the heat conduction equation, and radiation is modelled using widely accepted correlations. These correlations were coupled and implemented into a computer model using C++. Through numerical analysis the relevance and accuracy of each transfer mode was rigorously analysed. Once validated, the intended loading conditions at the power station were imposed onto the pond model in order to assess its cooling viability. It is concluded that the pond not only poses a sustainable and environmentally neutral cooling augmentation device, but is also cost effective. | en_ZA |
| dc.identifier.apacitation | Gosai, P. (2014). <i>Viability assessment of enhancing dry cooling systems using thermal storage ponds</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering. Retrieved from http://hdl.handle.net/11427/9137 | en_ZA |
| dc.identifier.chicagocitation | Gosai, Priyesh. <i>"Viability assessment of enhancing dry cooling systems using thermal storage ponds."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2014. http://hdl.handle.net/11427/9137 | en_ZA |
| dc.identifier.citation | Gosai, P. 2014. Viability assessment of enhancing dry cooling systems using thermal storage ponds. University of Cape Town. | en_ZA |
| dc.identifier.ris | TY - Thesis / Dissertation AU - Gosai, Priyesh AB - Dry cooled systems are employed to reject heat in modern power plants. Unfortunately, these cooling systems become less effective under windy conditions and when ambient temperatures are high. One proposed solution to this problem is to augment the cooling capacity of the dry cooled system by means of utilizing evaporative cooling ponds which can be operated in parallel during adverse ambient conditions. This study investigates a concept for a South African power station. The system utilises waste-water from evaporation ponds which will supply a surface condenser connected in parallel to the dry cooled system. The development of this system requires an accurate model to predict the transient thermal response of the pond. No such pond model is available in open literature due to the pond under consideration having a unique size as well as size to depth ratio. Various heat transfer modes are numerically modelled for large evaporation ponds, including free surface evaporation which is a transient and complex phenomenon. Evaporation at the surface is the primary heat and only mass transfer driver. The modified Ryan equation proposed by an experimentally validated study was used to estimate evaporation on the surface. Convection is modelled using a correlation that was derived and experimentally tested for applications in the natural environment. Heat transfer via conduction to the ground is solved using a one dimensional finite difference solution to the heat conduction equation, and radiation is modelled using widely accepted correlations. These correlations were coupled and implemented into a computer model using C++. Through numerical analysis the relevance and accuracy of each transfer mode was rigorously analysed. Once validated, the intended loading conditions at the power station were imposed onto the pond model in order to assess its cooling viability. It is concluded that the pond not only poses a sustainable and environmentally neutral cooling augmentation device, but is also cost effective. DA - 2014 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 T1 - Viability assessment of enhancing dry cooling systems using thermal storage ponds TI - Viability assessment of enhancing dry cooling systems using thermal storage ponds UR - http://hdl.handle.net/11427/9137 ER - | en_ZA |
| dc.identifier.uri | http://hdl.handle.net/11427/9137 | |
| dc.identifier.vancouvercitation | Gosai P. Viability assessment of enhancing dry cooling systems using thermal storage ponds. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Mechanical Engineering, 2014 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/9137 | en_ZA |
| dc.language.iso | eng | en_ZA |
| dc.publisher.department | Department of Mechanical Engineering | en_ZA |
| dc.publisher.faculty | Faculty of Engineering and the Built Environment | |
| dc.publisher.institution | University of Cape Town | |
| dc.title | Viability assessment of enhancing dry cooling systems using thermal storage ponds | en_ZA |
| dc.type | Master Thesis | |
| dc.type.qualificationlevel | Masters | |
| dc.type.qualificationname | MSc | en_ZA |
| uct.type.filetype | Text | |
| uct.type.filetype | Image | |
| uct.type.publication | Research | en_ZA |
| uct.type.resource | Thesis | en_ZA |
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