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Registros recuperados: 10
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An Investigation of a Mathematical Model for the Internal Velocity Profile of Conical Diffusers Applied to DAWTs Anais da ABC (AABC)
BARBOSA,DISTERFANO L.M.; VAZ,JERSON R.P.; FIGUEIREDO,SÁVIO W.O.; SILVA,MARCELO DE OLIVEIRA E; LINS,ERB F.; MESQUITA,ANDRÉ L.A..
The Diffuser Augmented Wind Turbines (DAWTs) have been widely studied, since the diffusers improve the power coefficient of the wind turbine, particularly of small systems. The diffuser is a device which has the function of causing an increase on the flow velocity through the wind rotor plane due to pressure drop downstream, therefore resulting in an increase of the rotor power coefficient. This technology aids the turbine to exceed the Betz limit, which states that the maximum kinetic energy extracted from the flow is 59.26%. Thus, the present study proposes a mathematical model describing the behavior of the internal velocity for three conical diffusers, taking into account the characteristics of flow around them. The proposed model is based on the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: DAWTs; Diffusers; Wind energy; Biot-Savart's law.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000201133
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Computational Model for Microgeneration Simulation, From Solar and Wind Renewable Sources, With Optimal Allocation of Loads, Electric Vehicle and Energy Storage, In a Residential Electrical Micro Network BABT
Tiem,Wesley Thiago Egea; Unsihuay-Vila,Clodomiro.
Abstract The electrical sector is under constant evolution. One of the areas refers to the consumers that come to be generators, implementing distributed generation, interconnected to a smart grid. This article discusses the improvement of an algorithm, already presented in the literature, to make the best temporal allocation of loads, electric vehicle, storage and many sources of generation, aiming at the maximum financial performance, that is, the lowest value for the energy invoice The modeling consists of a Mixed Integer Linear Programming (MILP) algorithm, which considers each component of the system and weighs the maintenance and shelf life of storage devices, basically batteries, loads that can be reallocated and the concept of Vehicle-to-grid,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microgrid; Microgeneration; Distributed generation; Wind energy; Solar energy; Load reallocation; Storage; Electric vehicle; Smart grid.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000200215
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Control Strategies for Floating Offshore Wind Turbine: Challenges and Trends ArchiMer
Salic, Tom; Charpentier, Jean Frédéric; Benbouzid, Mohamed; Le Boulluec, Marc.
The offshore wind resource has huge energy potential. However, wind turbine floating structures have to withstand harsh conditions. Strong wind and wave effects combine to generate vibrations, fatigue, and heavy loads on the structure and other elements of the wind turbine. These structural problems increase maintenance requirements and risk of failure, while reducing availability and energy production. Another challenge for wind energy is to reduce production costs in order to be competitive with other alternatives. From the control point of view, the objective of lowering costs can be achieved by operating the turbine close to its optimum point of operation under partial load, guaranteeing reliability by reducing structural loads and regulating the power...
Tipo: Text Palavras-chave: Wind energy; Floating offshore wind turbine; Control; State of art review.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00588/69991/67899.pdf
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Economic Evaluation of Wind Energy as an Alternative to Natural Gas Powered Irrigation AgEcon
Guerrero, Bridget L.; Amosson, Stephen H.; Marek, Thomas H.; Johnson, Jeffrey W..
High natural gas prices have agricultural producers searching for alternative energy sources for irrigation. The economic feasibility of electric and hybrid (electric/wind) systems are evaluated as alternatives to natural gas powered irrigation. Texas Panhandle and Southern Kansas farms are assessed with a quarter-mile sprinkler system, three crops, and two pumping lifts. Breakeven points identify the price at which conversion from a natural gas irrigation system to an electric or hybrid system is cost effective. Results indicate electricity is a more feasible energy source for irrigation and policy changes such as net metering are necessary to make hybrid systems viable.
Tipo: Journal Article Palavras-chave: Electricity; Irrigation; Natural gas; Wind energy; Agribusiness; Community/Rural/Urban Development; Environmental Economics and Policy; Farm Management; International Development; Land Economics/Use; Research and Development/Tech Change/Emerging Technologies; Resource /Energy Economics and Policy; Q12; Q20; Q42.
Ano: 2010 URL: http://purl.umn.edu/90680
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Impacto social del arrendamiento de tierras para generar energía eléctrica en La Venta, Juchitán de Zaragoza, Oaxaca. Colegio de Postgraduados
Racilla Manuel, Sarita.
La investigación analiza lo que es el impacto social del arrendamiento de tierras y los cambios producidos por la instalación de parques eólicos, como caso de estudio del Ejido de La Venta, Juchitán de Zaragoza, Oaxaca. La tesis se realizó con una metodología mixta;(cuantitativa-cualitativa), para analizar el fenómeno antes descrito; está comprendida en cuatro capítulos. El primer capítulo plantea la estructura general de la investigación. El segundo, aborda el marco teórico y distintas visiones acerca del fenómeno de impacto social sobre el arrendamiento de tierras, basado en la energía eólica producida en el estado de Oaxaca. La metodología de la investigación hace referencia a las herramientas cualitativas y cuantitativas utilizadas para la recopilación...
Palavras-chave: Energía eólica; Impacto social; Arrendamiento de tierras; Wind energy; Social impact; Land leasing; Rural development; Desarrollo rural; Maestría.
Ano: 2013 URL: http://hdl.handle.net/10521/1885
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Land Use Issues: The Last Settler’s Syndrome AgEcon
Groothuis, Peter A..
In the last settler’s syndrome, each new settler wants the area to remain as it was on their arrival. Newcomers’ preferences often differ from long-term residents, and conflicts arise. To explore land use issues among various groups, a survey of opinions on mountain views was developed and administered to Watauga County residents in western North Carolina. Watauga County provides an interesting case study, because it is a growing area with an influx of newcomers along with long-time residents. The results suggest that agreements can be achieved on some land use issues, whereas disagreements will arise on others.
Tipo: Journal Article Palavras-chave: Billboards; Contingent valuation; Land use; Scenic amenities; Wind energy; Farm Management; International Development; Land Economics/Use; R14; Q51.
Ano: 2010 URL: http://purl.umn.edu/90668
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Offshore wind climatology based on synergetic use of Envisat ASAR, ASCAT and QuikSCAT ArchiMer
Hasager, Charlotte B.; Mouche, Alexis; Badger, Merete; Bingol, Ferhat; Karagali, Ioanna; Driesenaar, Tilly; Stoffelen, Ad; Pena, Alfredo; Longepe, Nicolas.
The offshore wind climatology in the Northern European seas is analysed from ten years of Envisat synthetic aperture radar (SAR) images using a total of 9256 scenes, ten years of QuikSCAT and two years of ASCAT gridded ocean surface vector wind products and high-quality wind observations from four meteorological masts in the North Sea. The traditional method for assessment of the wind resource for wind energy application is through analysis of wind speed and wind direction observed during one or more years at a meteorological mast equipped with well-calibrated anemometers at several levels. The cost of such measurements is very high and therefore they are only sparsely available. An alternative method is the application of satellite remote sensing....
Tipo: Text Palavras-chave: Offshore wind; SAR; QuikSCAT; ASCAT; Wind energy; Resource; Northern Europe.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00239/35007/33542.pdf
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Socioeconomic Impacts of the Langdon Wind Energy Center AgEcon
Leistritz, F. Larry; Coon, Randal C..
The Langdon Wind Energy Center is the largest wind energy facility to be developed in North Dakota to date and consists of 106 turbines with a generating capacity of 1.5 MW each, mounted on towers 262 feet tall. The project is owned by FPL Energy and Ottertail Power Company; FPL Energy was the project developer. Construction of the facility began in July, 2007 and was completed in January, 2008. The peak construction work force was 269 workers. A force of 10 permanent employees will operate and maintain the energy center. Construction of the Langdon Wind Energy Center is estimated to have resulted in payments of more than $56 million to entities within North Dakota. During operation, the facility will make payments of about $1.4 million annually to North...
Tipo: Report Palavras-chave: Wind energy; Renewable energy; Economic impact; Fiscal impact.
Ano: 2008 URL: http://purl.umn.edu/37285
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Technical and economic viability of the installation of a hybrid solar-wind generation system in a Brazilian industry BABT
Lara Filho,Mauro Obladen de; Unsihuay-Vila,Clodomiro; Silva,Vilson Roiz Gonçalves Rebelo da.
Abstract The demand for electricity is growing worldwide. At the same time, the non-renewable natural resources that account for a large proportion of the global energy matrix are rapidly depleting, which will pose a major challenge in the near future. Therefore, micro-grid models that use renewable energy sources, such as solar and wind, are rapidly developing and are becoming economically viable alternatives. The objective of this study was to evaluate the economic viability of installing solar and wind power generation systems in the NOVVALIGHT electrical components factory located in Campo Largo, Paraná, Brazil. The most viable model was the combination of solar and wind energy, which would generate approximately 260 MWh of energy per year. Using...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Distributed generation; Solar energy; Wind energy.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000200204
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Wind Power Development: Opportunities and Challenges AgEcon
van Kooten, G. Cornelis; Timilsina, Govinda R..
In this study, the prospects of wind power at the global level are reviewed. Existing studies indicate that the earth’s wind energy supply potential significantly exceeds global energy demand. Yet, only 1% of the global electricity demand is currently derived from wind power despite 40% annual growth in wind generating capacity over the last 25 years. More than 98% of total current wind power capacity is installed in the developed countries plus China and India. Existing studies estimate that wind power could supply 7% to 34% of global electricity needs by 2050. Wind power faces a large number of technical, financial, institutional, market and other barriers. To overcome these, many countries have employed various policy instruments, including capital...
Tipo: Working or Discussion Paper Palavras-chave: Wind energy; Renewable energy; Electricity grids; Resource /Energy Economics and Policy; Q25; Q32; Q42; Q48.
Ano: 2008 URL: http://purl.umn.edu/45665
Registros recuperados: 10
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