Wind Energy Assessment for Small Wind Turbines in Different Roof Shapes Based on CFD Simulations

2021 ◽  
pp. 3-13
Author(s):  
Carlos Oliveira ◽  
Adelaide Cerveira ◽  
José Baptista
Keyword(s):  
Wind Energy ◽  
Wind Turbines ◽  
Cfd Simulations ◽  
Energy Assessment ◽  
Small Wind Turbines

scholarly journals The Wind Energy Potential of Kurdistan, Iran

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Farzad Arefi ◽  
Jamal Moshtagh ◽  
Mohammad Moradi
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Wind Turbines ◽  
Wind Farms ◽  
Energy Potential ◽  
Average Wind Speed ◽  
Energy Assessment ◽  
Technical Specifications ◽  
Weather Stations ◽  
Calm Wind

In the current work by using statistical methods and available software, the wind energy assessment of prone regions for installation of wind turbines in, Qorveh, has been investigated. Information was obtained from weather stations of Baneh, Bijar, Zarina, Saqez, Sanandaj, Qorveh, and Marivan. The monthly average and maximum of wind speed were investigated between the years 2000–2010 and the related curves were drawn. The Golobad curve (direction and percentage of dominant wind and calm wind as monthly rate) between the years 1997–2000 was analyzed and drawn with plot software. The ten-minute speed (at 10, 30, and 60 m height) and direction (at 37.5 and 10 m height) wind data were collected from weather stations of Iranian new energy organization. The wind speed distribution during one year was evaluated by using Weibull probability density function (two-parametrical), and the Weibull curve histograms were drawn by MATLAB software. According to the average wind speed of stations and technical specifications of the types of turbines, the suitable wind turbine for the station was selected. Finally, the Divandareh and Qorveh sites with favorable potential were considered for installation of wind turbines and construction of wind farms.

scholarly journals Optimization of Power and Levelized Cost for Shrouded Small Wind Turbine

Inventions ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 59
Author(s):  
Hasanali Khojasteh ◽  
Younes Noorollahi ◽  
Mojtaba Tahani ◽  
Mehran Masdari
Keyword(s):  
Wind Energy ◽  
Objective Function ◽  
Wind Power ◽  
Wind Turbines ◽  
Power Plants ◽  
Large Scale ◽  
Renewable Energies ◽  
Levelized Cost ◽  
Small Wind Turbines ◽  
Input Parameters

Nowadays, by increasing energy demand and considering the importance of environmental issues in recent decades, the use of renewable energies is expanding. Among renewable energies, wind power and its technology are growing and evolving more rapidly. Resource assessment in Iran has revealed the significant potential of wind energy around the country. To further develop wind energy in the country and create large-scale wind power plants, the consideration of distributed power generation using small wind turbines for applications in agricultural and residential use is needed. Conventional small wind turbines and small wind lens turbines have been developed in recent years. In this research project, a small wind lens turbine is designed. The advantages of this turbine are an increased production capacity and reduced cut-in speed and noise pollution. In this study, a lens (or shroud) is added to a small turbine, and the maximized annual energy production (AEP) and minimization of the levelized cost of energy (LCOE) are modeled. We applied the NSGA-II algorithm for optimization to find the best answer. The input parameters in the objective function of the AEP are cut-in, cut-out, rated speeds, scale factor, and shape factor. Additionally, the input parameters in the objective function of the LCOE are the power production, initial capital cost, annual operating expenses, and balance of energy. The results indicate that installing a wind lens turbine in Kish Island led to an LCOE decrease of 56% on average, and we can see an 83% increase in the AEP. In the Firoozkooh area, an average reduction of 59% in the LCOE and 74% increase in the AEP for a wind lens turbine is observed.

scholarly journals Holistic Design of Small-scale Stand-alone Wind Energy Conversion Systems Using Locally Manufactured Small Wind Turbines

2020 ◽  
Vol 1618 ◽  
pp. 042012
Author(s):  
Kostas Latoufis ◽  
Giannis Serafeim ◽  
Katerina Chira ◽  
Vasilis Riziotis ◽  
Spyros Voutsinas ◽  
...  
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Wind Turbines ◽  
Small Scale ◽  
Wind Energy Conversion ◽  
Wind Energy Conversion Systems ◽  
Small Wind Turbines ◽  
Energy Conversion Systems ◽  
Holistic Design

Dynamic Optimization of Drivetrain Gear Ratio to Maximize Wind Turbine Power Generation—Part 2: Control Design

2012 ◽  
Vol 135 (1) ◽  
Author(s):  
John F. Hall ◽  
Dongmei Chen
Keyword(s):  
Wind Energy ◽  
Wind Turbine ◽  
Wind Turbines ◽  
Electrical Power ◽  
Control Design ◽  
Gear Ratio ◽  
Small Wind Turbines ◽  
Full Load Operation ◽  
Wind Profiles ◽  
Turbine Model

The cost of electrical power produced by small wind turbines impedes the use of this technology, which can otherwise provide power to millions of homes in rural regions worldwide. To encourage their use, small wind turbines must capture wind energy more effectively while avoiding increased equipment costs. A variable ratio gearbox (VRG) can provide this capability to the simple fixed-speed wind turbine through discrete operating speeds. This is the second of a two-part publication that focuses on the control of a VRG-enabled wind turbine. The first part presented a 100 kW fixed speed, wind turbine model, and a method for manipulating the VRG and mechanical brake to achieve full load operation. In this study, an optimal control algorithm is developed to maximize the power production in light of the limited brake pad life. Recorded wind data are used to develop a customized control design that is specific to a given site. Three decision-making modules interact with the wind turbine model developed in Part 1 to create possible VRG gear ratio (GR) combinations. Dynamic programming is applied to select the optimal combination and establish the operating protocol. The technique is performed on 20 different wind profiles. The results suggest an increase in wind energy production of nearly 10%.

scholarly journals How Much Can Small-Scale Wind Energy Production Contribute to Energy Supply in Cities? A Case Study of Berlin

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5523
Author(s):  
Alina Wilke ◽  
Zhiwei Shen ◽  
Matthias Ritter
Keyword(s):  
Wind Energy ◽  
Wind Turbines ◽  
Renewable Resources ◽  
Energy Production ◽  
Economic Feasibility ◽  
Small Scale ◽  
Small Wind Turbines ◽  
Urban Energy ◽  
Complete Framework

In light of the global effort to limit the temperature rise, many cities have undertaken initiatives to become climate-neutral, making decentralized urban energy production more relevant. This paper addresses the potential of urban wind energy production with small wind turbines, using Berlin as an example. A complete framework from data selection to economic feasibility is constructed to enable the empirical assessment of wind energy for individual buildings and Berlin as a whole. Based on a detailed dataset of all buildings and hourly wind speed on a 1 km² grid, the results show that multiple turbines on suitable buildings can significantly contribute to households’ energy consumption but fall short of covering the full demand. For individual households, our economic evaluation strongly recommends the self-consumption of the produced electricity. The findings suggest that while the use of small wind turbines should be continuously encouraged, exploring other renewable resources or combination of wind and photovoltaic energy in the urban environment remains important.

scholarly journals Long-Term Wind Characteristics at Selected Locations in Mauritius for Power Generation

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
A. Z. Dhunny ◽  
M. R. Lollchund ◽  
S. D. D. V. Rughooputh
Keyword(s):  
Wind Speed ◽  
Wind Energy ◽  
Wind Turbines ◽  
Fossil Fuels ◽  
Energy Output ◽  
Energy Potential ◽  
Wind Speed Data ◽  
Average Wind ◽  
Small Wind Turbines ◽  
Mean Wind Speed

Interests in wind energy have gained impetus in many developed and developing countries worldwide during the last three decades. This is due to awareness of the population about the depletion of fossil fuels as well as Government campaigns and initiatives to encourage the use of renewable sources of energy. This work focuses on the wind energy potential at two selected locations (Plaisance and Vacoas) in Mauritius. The emphasis is to assess whether small-wind turbines have a potential in these regions for generation of power for domestic applications. Such wind turbines can range in size from 400 W to 10 kW depending on the amount of electricity to be generated. The assessment is based on the correlation of the local wind speed data to a two-parameter Weibull probability distribution in order to effectively estimate the average wind power density of the sites. Nearly 40 years of mean wind speed data is utilized. Of the two sites investigated it is found that Plaisance yielded the highest wind velocity (as compared to Vacoas). The study also estimates the energy output of six commercial small-wind turbines of capacity ranging from 1 kW to 3 kW at these two sites, placed at multiple heights.

scholarly journals Wind Energy Potential of Gaza Using Small Wind Turbines: A Feasibility Study

Energies ◽  
2017 ◽  
Vol 10 (8) ◽  
pp. 1229 ◽  
Author(s):  
Mohamed Elnaggar ◽  
Ezzaldeen Edwan ◽  
Matthias Ritter
Keyword(s):  
Wind Energy ◽  
Feasibility Study ◽  
Wind Turbines ◽  
Energy Potential ◽  
Small Wind Turbines ◽  
Wind Energy Potential

scholarly journals On the potential yield of wind turbines on high-rise buildings

2021 ◽  
Vol 238 ◽  
pp. 01004
Author(s):  
Giulio Vita ◽  
Simone Salvadori ◽  
Anina Sarkić-Glumac ◽  
Daniela Anna Misul
Keyword(s):  
Wind Energy ◽  
Wind Turbines ◽  
Medium Size ◽  
Climate Data ◽  
Horizontal Axis Wind Turbine ◽  
Potential Yield ◽  
Local Flow ◽  
Large Variability ◽  
High Rise ◽  
Small Wind Turbines

Urban wind energy has intrigued some investments and applications over the last decade. However, most applications have been unsuccessful, in many cases leaving behind non-rotating wind turbines in the built environment. Research on urban wind energy has also lacked in providing a reliable description of the local flow features small wind turbines are placed in, and the positioning strategy is mostly based on empiricism. This study uses data from a wind tunnel test on the flow pattern above the roof of high-rise buildings to estimate the potential yield of small wind turbines installed in various configurations. The data are collected at a height of 12 m above the flat roof under various wind directions. The capacity factor of a medium-size horizontal axis wind turbine is calculated using power curve data available from the literature. The local wind resource is calculated using the mean wind speed as measured with hot-wire anemometry. The annual energy production of the various configurations is calculated using the climate data available for Firenze (IT) and the orientation of the building with respect to main winds. A rather large variability in the power output of the roof-farm was found for the chosen configuration.

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