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Marine Current Energy Converters to Power a Reverse Osmosis Desalination Plant
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2018 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 11, article id 2880Article in journal (Refereed) Published
Abstract [en]

Some countries are facing issues on freshwater and electricity production, which can be addressed with the use of renewable energy powered desalination systems. In the following study, a reverse osmosis desalination plant powered by marine current energy converters is suggested. The marine current energy converters are designed at Uppsala University in Sweden, specifically for utilizing low water speeds (1–2 m/s). Estimations on freshwater production for such a system, in South Africa, facing the Indian Ocean was presented and discussed. It is concluded that the desalination plant cannot by itself supply freshwater for a population all the time, due to periods of too low water speeds (<1 m/s), but for 75% of the time. By using ten marine current energy converters, each with a nominal power rating of 7.5 kW, combined with a reverse osmosis desalination plant and water storage capacity of 2800 m3, it is possible to cover the basic freshwater demand of 5000 people. More studies on the hydrokinetic resource of the Western Indian Ocean, system cost, technology development, environmental and social aspects are necessary for more accurate results.

Place, publisher, year, edition, pages
2018. Vol. 11, article id 2880
Keywords [en]
marine current- tidal energy converters, hydro-kinetic energy, desalination, freshwater production, renewable energy, western Indian Ocean
National Category
Environmental Engineering Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:uu:diva-362542DOI: 10.3390/en11112880OAI: oai:DiVA.org:uu-362542DiVA, id: diva2:1253775
Available from: 2018-10-05 Created: 2018-10-05 Last updated: 2018-12-12Bibliographically approved
In thesis
1.
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2. Studies of a Vertical Axis Turbine for Marine Current Energy Conversion: Electrical system and turbine performance
Open this publication in new window or tab >>Studies of a Vertical Axis Turbine for Marine Current Energy Conversion: Electrical system and turbine performance
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ocean energy is a field of growing interest when it comes to renewable energy thanks to its high density of energy per unit area, and to the high predictability. Conversion of hydrokinetic energy, found in marine currents, is the utilization of the energy in free-flowing water for conversion to electric energy. This thesis presents experimental data from a test site with a marine current converter.

The converter system features a vertical axis turbine directly connected to a permanent magnet synchronous generator placed on the riverbed. The converter is controlled by an electrical system. The focus of the work is to evaluate power control methods and turbine performance.  

Results of a simple voltage control system is presented and compared with operation without control. The turbine type in the converter system is not self-starting. The startup power and energy has been investigated through experiments. The converter system has been connected to the local electric utility grid and the first experimental results are presented.  

The performance of the turbine for a range of water speeds is investigated. The range of experiments are limited by the water velocity at the experimental site. To address the issue, a simulation model coupling the electrical system and hydrodynamic model into one has been validated. One factor affecting the turbine's power capture is the angle of the blade pitch relative to the water flow. The influence of blade pitch on turbine performance is studied with experiments and two 3D simulation models.

The possibilities of powering a desalination plant using marine current converters is discussed. Water speed data from outside the east coast of South Africa has been used for a case study. The study investigates how many people can early be supplied with freshwater using the converter system at the experimental site as a model. 

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 77
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1739
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Science of Electricity
Identifiers
urn:nbn:se:uu:diva-363256 (URN)978-91-513-0491-5 (ISBN)
Public defence
2018-12-13, 80101, Ångströmslaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:15 (English)
Opponent
Supervisors
Available from: 2018-11-21 Created: 2018-10-25 Last updated: 2018-11-30
3. Wave Powered Desalination
Open this publication in new window or tab >>Wave Powered Desalination
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this licentiate thesis is to investigate opportunities to produce fresh-water and electricity using marine renewable energy sources, such as wave power and marine current power, for water scarce areas. It summarizes the ongoing work within the field and suggests some possibilities of future re-search. Specifically, the desalination process reverse osmosis has been dis-cussed in combination with the wave energy concept designed at Uppsala Uni-versity for a site by the Kenyan coast. A review on wave powered desalination systems was presented, and the wave climate of the Kenyan coast was reana-lyzed and discussed with respect to the wave power and desalination applica-tion. Also, the magnetic circuit of the linear generator was investigated, as well as the control of the system, to enhance its sustainability. Moreover, the marine current energy converter designed at Uppsala University was investi-gated for desalination purposes. Only literature studies and simulations were performed, and the research would benefit from experimental work.

Place, publisher, year, edition, pages
Uppsala: Uppsala universitet, 2018
Series
UURIE / Uppsala University, Department of Engineering Sciences, ISSN 0349-8352 ; 354-18L
Keywords
wave power, desalination, marine renewable energy sources, marine current, freshwater
National Category
Engineering and Technology
Research subject
Engineering Science
Identifiers
urn:nbn:se:uu:diva-369356 (URN)
Presentation
2018-11-15, 2005 Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2015-03126StandUp
Available from: 2018-12-12 Created: 2018-12-12 Last updated: 2018-12-12Bibliographically approved

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Leijon, JenniferForslund, JohanThomas, KarinBoström, Cecilia

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