Microgeração de energia eletrica (abaixo de 100kw) utilizando turbina tesla modificada

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Lógica Fuzzy aplicada ao controle de um sistema híbrido de geração de energia elétrica: eólica, fotovoltaica e biogás

Pós-graduação em Engenharia Mecânica - FEG

Energia eólica: uma alternativa de energia renovável para a matriz energética do Brasil?

O presente trabalho possui o intuito de analisar o panorama de energia eólica em âmbito mundial, dando um enfoque maior para seu cenário no Brasil. Primeiramente, estudando a história da energia eólica, seu advento, para fins de solução ao viés ambiental e à necessidade de diversificação da matriz energética mundial, com a finalidade de assumir os compromissos firmados no Protocolo de Kyoto, e, no caso do Brasil, da menor dependência do abastecimento externo

Viabilidade de turbinas eólicas de pequeno porte no Brasil

Facing a global scenario where oil is scarce and the emission of CO2 in the atmosphere is a world concern, the search for new methods of energy production becomes the focus of all countries. Based on these assumptions, the wind power gains highlight and happen to be the most exploited around the world, since this does not produce toxic waste, since it uses the wind, no raw material shortage and its cost and efficiency are increasingly attractive. Taking advantage of the geographical features of Brazil, coastal and territorial extension, this study aims to analyze the feasibility of using wind turbines widely used in Germany, one of the countries with the highest production of energy through wind, in Brazil. In order to increase the energy production without causing more environmental impacts, geographical analyses will be made, and to determine the features and costs of production of this type of energy generation, and at the end of this dissertation, will finish for one of the turbines, Montana, is it feasible to install, however due to the Government's little incentive return is not very expressive. With respect to the turbine Passaat, this is infeasible to install under current conditions

Estudo e modelagem 3D de uma turbina Francis

Most of the hydraulic turbines that are running in the world are the Francis type, because they are able to fit a wide range of head and flow. We also can declare that most of the installed hydraulic energy up to this date is generated by this type of turbine. On the other hand, if we pay attention to mechanical details of a Francis turbine we will see that among the three most used types it is the one that presents the more complex design. And, the simplest one is the Pelton type, whereas the Kaplan is the one less utilized. This work aims to develop the hydrodynamic calculation of a Francis turbine as well as to obtain its assembly drawing and 3D modeling drawing. In this way all details must be shown therefore needing a complete knowledge about this issue. Both 2D and 3D drawings help much if one wants the machine to be running in its power house. It is well noted that most of the entities that design and manufacture the Francis turbines are not brazilian. In this way the more we study how to design this kind of machine the more is our contribution to our country in order to conquer technology and manufacture Francis turbines

Análise técnica e econômica da utilização da energia solar e eólica em uma propriedade rural para geração de eletricidade, bombeamento e aquecimento de água

This paper is about a case study of using solar energy and wind energy in a farm. For this purpose were collected from the property, such as water consumption and amount of residents. So, we estimate how many conventional panels or PET bottle panels and boiler needed to supply the farm with warm water. It also calculates the amount of photovoltaic panels and the main accessories for converting solar energy into electrical energy. For the pumping of water using photovoltaic panels is dismissed and dimensioned to be a watermill

Estudo analise e exemplo de aplicação de geração eólica

Brazil economic growth has to predict the need for implementation of new energy sources to ensure the continuity of the economic growth and improvement of life of the brazilian population. Until this moment, this assistance included the construction of large hydroelectric plants, mainly in the amazon region, where the environmental impact is difficult or, as in the case of the Belo Monte made this impossible so far, the implementation of these projects. In this work is conducted a study that demonstrates an example of application of wind energy, through an assessment of wind resources in the brazilian Northeast for the implementation of a wind farm

Estudo sobre uma turbina a gás instalada em uma refinaria de petróleo

The gas turbine (GT) is known to have: low cost of capital over the amount of energy, high flexibility, high reliability, short delivery time, commissioning and commercial operation at the beginning and quick departure. The gas turbine is also recognized for its superior environmental performance, manifested in air pollution containment and reducing greenhouse gases (Mahi, 1994). Gas turbines in simple cycle mode (SC) have long been used by utilities to limited power generation peak. In addition, manufacturing facilities use gas turbines for power generation units on site, often in combination with the process of heat production, such as hot water and steam process. In recent years, the performance of industrial gas turbines has been improved due to significant investments in research and development, in terms of fuel to electricity conversion efficiency, plant capacity, availability and reliability. The greater availability of energy resources such as natural gas (NG), the significant reduction of capital costs and the introduction of advanced cycles, have also been a success factor for the increased use of gas turbines to load applications base (Poulikas, 2004). Open Cycle Gas Turbine with a greater degree of heat to the atmosphere may alternatively be used to produce additional electricity using a steam cycle, or to compose a cogeneration process. The combined cycle (CC) uses the heat from the gas turbine exhaust gas to increase the power output and increase the overall efficiency of more than 50% second (Najjar, 2001). The initial discovery of these cycles in the commercial power generation market was possible due to the development of the gas turbine. Only from the 1970s that gas turbine inlet temperature and therefore the exhaust gas temperature was sufficiently high to allow a better efficiency in the combined cycle ... (Complete Abstract click electronic access below)

Estudo da produção de hidrogênio eletrolítico a partir de fontes eólica, solar e hidrelétrica

Introduces technical, economic and environmentally competitive solutions in the energy market is a great challenge for society. This work examines each of these aspects considering the production of electrolytic hydrogen with energy from wind power, solar and hydropower, in order to ensure an overview of this energy carrier. Initially, an assessment of the technical aspects is made addressing existing electrolysers technologies, its main characteristics and differences. The geographical distribution of wind, solar and hydroelectric potential in Brazil is also mapped, and a configuration scheme of a hydrogen production system is discussed. Subsequently, the economic analysis calculates the cost of investment in the alkaline electrolyser of 60 Nm³ / h, similar to the Brazilian bus powered by hydrogen project, coordinated by EMTU. Since the main input of electrolysis is electricity, is analyzed the latest energy auctions of each primary source and it is calculated the cost of production of the wind, solar and hydropower hydrogen. Postponed to this, are investigated the intrinsic environmental impacts of electricity generation process, proposing a readjustment of an indicator of ecological efficiency for the production of hydrogen. Finally, the work discusses the concept of externalities and demonstrates how the incorporation of external costs can leverage the hydrogen economy. In short, it is evident that the wind and hydroelectric hydrogens are more promising compared to solar hydrogen, whether in the economic aspect, because it achieved lower costs, whether in the environmental aspect, because it reached the highest ecological efficiency

Viabilidade da geração de eletricidade a partir de fonte eólica on-shore: dificuldades e vantagens de expansão na matriz elétrica brasileira

The renewable energy sources presents an important role on the world's current context, its growing is essentially connected to the environmental issues and the energetic security, guided by the search for alternatives of energy. Among the alternative energy sources, the wind energy shows great importance in the brazilian territory, it has a great potential still unexplored and constant growth in the national electric matrix. The specific factor of generation, the conjuncture and the incentive politics influence on the expansion of wind energy in Brazil. Thus, the brazilian wind sector shows features which can be evaluated enable its developing. Keeping that in mind, the present work aims identify which are the advantages and the difficulties for the expansion of this energy source in the brazilian electric matrix. For that, the work studies the different parameters: features of electric generation of the different energy sources, incentive politics, generation costs, CO2 emission, evolution of wind energy in Brazil, the brazilian wind potential, and the regime of complementarily hydro-wind

Comparação in vitro da utilização do ultrassom e da turbina de alta-rotação na odontossecção de teerceiros molares inferiores

A extração de dentes inclusos pode ser realizada utilizando diferentes técnicas cirúrgicas, senda a odontossecção com o uso de instrumentos rotatórios a mais utilizada nos dias atuais com o uso das turbinas de alta rotação. Recentemente têm sido empregado o aparelho de ultra-som para a realização da odontossecção e da osteotomia nas cirurgias bucais, justificando o seu uso por promoverem uma maior segurança aos tecidos moles adjacentes e promoverem um corte mais preciso. Objetivo: A proposta deste estudo é comparar, in vitro, a eficácia das pontas diamantadas acopladas ao ultrassom quando comparadas às pontas diamantadas acopladas no motor de alta-rotação durante o seccionamento de terceiros molares inferiores e nas técnicas de osteotomias. Metodologia: 45 terceiros molares inferiores humanos hígidos foram incluídos em resina acrílica transparente para padronização da posição desejada durante o corte utilizando a turbina de alta rotação, o aparelho de ultra-som ou a associação de ambos. Os tempos de odontossecção e osteotomia foram calculados a comparados entre os diferentes grupos. Resultados: Durante a odontossecção o grupo ultra-som apresentou tempo médio bem acima dos outros grupos, demonstrando haver diferença estatisticamente significante em relação aos grupos alta-rotação e alta-rotação+ultra-som (p0.05). Quando analisado o tempo gasto para a osteotomia, não foram observadas diferenças estatisticamente significantes entre os 3 grupos (p>0,05). Conclusões: A utilização dos métodos em associação (alta-rotação+ultra-som) apresenta-se como uma opção segura e rápida para os procedimentos de osteotomia e odontossecção, possibilitando uma maior segurança aos tecidos adjacentes.

Estimación de la potencia eólica en una zona mediante el apoyo de estaciones meteorológicas de referencia y el empleo de técnicas estadísticas no paramétricas, funcionales y de machine learning: aplicación a las islas Canarias

Programa de doctorado: Tecnología industrial