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Elif Oguz
Hydraulics Laboratory, Civil Engineering Department, Middle East Technical University, 06800, Turkey

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Review
Published: 26 October 2020 in Energy Conversion and Management
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The trend of utilizing renewable energy sources is witnessing a brisk growth around the world. Among the various sources of renewable energy, hydropower is considered the most favorable due to its high potential and distinct advantages such as predictability, high energy density etc. Moreover, to extract the hydrokinetic energy from flowing streams, different designs of hydrokinetic turbines have emerged which operate on a similar principle as the wind turbines. The Savonius turbine is a drag-based device reported to have good starting characteristics, which makes it a fitting choice for hydrokinetic energy extraction, especially in low-velocity flows. However, along the development, it was noted that somehow this turbine has a poor energy conversion efficiency. To overcome this limitation, various design optimization strategies have been proposed. This paper attempts to review the optimization studies of Savonius turbine regarding its probable applications in harnessing hydrokinetic energy. The studies concerning each of the structural parameters influencing the turbine performance are discussed thoroughly. There is hardly any review study available hitherto, which exclusively discusses and summarizes the optimization studies conducted for Savonius design by solely considering water as the operating medium. Hence, the data presented in this study will serve as a basis to understand the existing research on Savonius turbine, thereby enabling researchers to fill the gaps in this area with reference to hydrokinetic applications.

ACS Style

Nauman Riyaz Maldar; Cheng Yee Ng; Elif Oguz. A review of the optimization studies for Savonius turbine considering hydrokinetic applications. Energy Conversion and Management 2020, 226, 113495 .

AMA Style

Nauman Riyaz Maldar, Cheng Yee Ng, Elif Oguz. A review of the optimization studies for Savonius turbine considering hydrokinetic applications. Energy Conversion and Management. 2020; 226 ():113495.

Chicago/Turabian Style

Nauman Riyaz Maldar; Cheng Yee Ng; Elif Oguz. 2020. "A review of the optimization studies for Savonius turbine considering hydrokinetic applications." Energy Conversion and Management 226, no. : 113495.

Journal article
Published: 20 April 2020 in Sustainability
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Several different designs and prototypes of ocean current turbines have been tested over recent years. For every design test, emphasis is given to achieving an optimum power output from the flow. In this study, the performance of a Horizontal Axis Ocean Current Turbine (HAOCT) has been investigated using three-dimensional Computational Fluid Dynamics (CFD) simulations for three cases, namely, (1) a turbine without a deflector, (2) a turbine with a deflector, and (3) a turbine with a deflector operating at a higher fluid depth. The turbine design was modeled in DesignModeler software and simulations were carried out in commercial CFD software Flow-3D. The Torque Coefficient (Cm) and Power Coefficient (Cp) for the turbine have been investigated for a certain range of Tip-Speed Ratios (TSRs) in a flow velocity of 0.7 m/s. Furthermore, comparisons have been made to demonstrate the effect of the deflector on the performance of the turbine and the influence of a higher fluid pressure on the same. The results from the simulations indicate that the higher value of Cp was achieved for Case 2 as compared to the other two cases. The findings from the study indicate that the use of the deflector enhances the performance of the turbine. Furthermore, a higher fluid pressure acting on the turbine has a significant effect on its performance.

ACS Style

Nauman Riyaz Maldar; Cheng Yee Ng; Lee Woen Ean; Elif Oguz; Ahmad Fitriadhy; Hooi Siang Kang. A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths. Sustainability 2020, 12, 3333 .

AMA Style

Nauman Riyaz Maldar, Cheng Yee Ng, Lee Woen Ean, Elif Oguz, Ahmad Fitriadhy, Hooi Siang Kang. A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths. Sustainability. 2020; 12 (8):3333.

Chicago/Turabian Style

Nauman Riyaz Maldar; Cheng Yee Ng; Lee Woen Ean; Elif Oguz; Ahmad Fitriadhy; Hooi Siang Kang. 2020. "A Comparative Study on the Performance of a Horizontal Axis Ocean Current Turbine Considering Deflector and Operating Depths." Sustainability 12, no. 8: 3333.

Journal article
Published: 09 October 2019 in Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi
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ACS Style

Elif Oğuz. İki hidrodinamik programın karşılaştırılması. Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi 2019, 21, 600 -609.

AMA Style

Elif Oğuz. İki hidrodinamik programın karşılaştırılması. Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi. 2019; 21 (2):600-609.

Chicago/Turabian Style

Elif Oğuz. 2019. "İki hidrodinamik programın karşılaştırılması." Balıkesir Üniversitesi Fen Bilimleri Enstitüsü Dergisi 21, no. 2: 600-609.

Journal article
Published: 29 July 2019 in Sustainability
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Energy production without destroying the environment has been one of the most crucial issues for people living in today’s world. In order to analyze whole environmental and/or economic impacts of the energy production process, life cycle assessment (LCA) and life cycle cost (LCC) are widely used. In this study, two distinct renewable energy systems are assessed. First, a land-based wind farm, which has been operating in Bozcaada Island since 2000, is compared to a proposed solar photovoltaic power plant in terms of Energy Pay-Back Time (EPBT) periods and greenhouse gas (GHG) emissions and life cycle cost. The energy production process including the recycling phase evaluated “from cradle to grave” using GaBi software for both cases. All scenarios are compared by considering different impact categories such as global warming potential (GWP), acidification potential (AP), and eutrophication potential (EP). Following this, levelized unit cost to produce 1 MWh electricity (LUCE) is calculated for both systems. This study revealed that LCA and LCCA are useful and practical tools that help to determine drawbacks and benefits of different renewable energy systems considering their long-term environmental and economic impacts. Our findings show that onshore wind farms have a number of benefits than proposed photovoltaic power plants in terms of environmental and cost aspects.

ACS Style

Elif Oğuz; Ayşe Eylül Şentürk. Selection of the Most Sustainable Renewable Energy System for Bozcaada Island: Wind vs. Photovoltaic. Sustainability 2019, 11, 4098 .

AMA Style

Elif Oğuz, Ayşe Eylül Şentürk. Selection of the Most Sustainable Renewable Energy System for Bozcaada Island: Wind vs. Photovoltaic. Sustainability. 2019; 11 (15):4098.

Chicago/Turabian Style

Elif Oğuz; Ayşe Eylül Şentürk. 2019. "Selection of the Most Sustainable Renewable Energy System for Bozcaada Island: Wind vs. Photovoltaic." Sustainability 11, no. 15: 4098.