Ike-Offiah , Chiedozie Augustine
With the ever-growing global interest in reducing greenhouse gases such as CO2, renewable energy options present a good energy alternative. Not only are they a sustainable option in their operational period, but they also have a low implementation cost especially, when compared to conventional fossil fuel sources. Hydrokinetic turbines have the advantages of energy predictability, relatively low visual impact, a high energy density, high capacity factor, and ease of manufacture, in addition to the low cost of deployment. This study focuses on the investigation and modification of Savonius hydrokinetic turbines operating at a low speed. ANSYS CFX as the commercial solver is utilized to simulate the transient flow field using the slidingmesh technique, along with the proper boundary conditions. Important controlling parameters include the aspect ratio (AR), overlap ratio, and shape of the blades. The numerical set up is validated by comparing the results with the results of available studies in literature. The elliptical-shaped blade design, is proposed in this study since it generates higher positive torque in comparison with that of the conventional one. The optimal overlap ratio is found for the modified design based on available literature, while the optimal AR is detected by testing different AR values


Literature review on BIM-based building energy performance optimization
Can, Esra; Akçamete Güngör, Aslı (İstanbul Teknik Üniversitesi; 2020-11-14)
Buildings comprise a large part of global energy consumption and make a significant contribution to overall CO2 emissions in the world. Therefore, increasing the energy efficiency of buildings becomes a priority to reduce these undesirable effects. Building energy performance assessments are complex multi-criteria problems as the energy performance is affected by many factors such as building orientation, envelope design, climate conditions, daylighting levels, and HVAC system usage schedules. This complica...
A techno-economic feasibility study of a gridconnected hybrid solar pv-wind power generation system in Zimbabwe
Samu, Remember; Fahrioğlu, Murat; Sustainable Environment and Energy Systems (2019-1)
The depletion of fossil fuel resources on a worldwide basis and an increase in greenhouse gas emissions and climate change as a whole have caused an urgent search for alternative sustainable energy sources to cater for the rising energy demands. The demand of energy is rapidly growing in both developing and developed nations thus making hybrid renewable energy power systems (RES), comprising Solar Photovoltaic (PV) and wind energy to be chosen as one of the best alternatives. However, on the downside, these...
Evaluation and comparasion of the wave energy potential in selected coastal regions in Turkey
Duman, Çağatay; Yalçıner, Ahmet Cevdet; Department of Civil Engineering (2010)
In order to meet energy needs in world, studies on wave energy, alternative energy, are becoming more and more important with each passing day. The purpose of this study is to identify the wave energy potential along the coastline of Turkey. For this purpose, the data of wind speed and direction, swell and wind wave height, period and direction for certain duration with the six hours time intervals are obtained from ECMWF for the wind and wave climate computations. In order to compute the wind and wave clim...
Experimental and computational investigation of hydrokinetic turbine
Güneş, Anıl; Yavuz, Mehmet Metin; Department of Mechanical Engineering (2022-8)
The answer to the increasing amount of energy consumption, mostly in carbon-based energy sources can be found in water and through the wind. The investigation of a special drag-based cross-flow hydrokinetic turbine (referred to as a Vertical Axis Wind Turbine for wind energy applications) called Savonius, is the main purpose of this study. Both experimentally and computationally studying this high self-starting ability turbine will open up the way to small-size energy production with very small water and wi...
Overcoming problems in Turkey's renewable energy policy: How can EU contribute?
Sirin, Selahattin Murat; Ege, Aylin (2012-09-01)
Fossil fuels cover most of the energy demand in the world, and this creates significant social, economic and environmental problems. Many countries have taken measures to increase the share of renewable energy sources (RES), especially in electricity generation, and the review of literature shows that the success of a country in RES diffusion depends on a comprehensive renewable energy policy which combines political commitment with stable and long-term support measures that stimulate technological innovati...
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