Análise do comportamento da bateria utilizada em sistemas fotovoltaicos de pequeno porte pequeno

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Comportamentos de risco para acidentes em playgrounds: identificação e opiniões de profissionais de educação infantil

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desenvolvimento e otimização de materiais nanocristalinos para células solares sensibilizadas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Acionamento de dois sistemas de bombeamento alimentados por uma central de microgeração fotovoltaica

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Estudos e aplicações da célula fotovoltaica DSC

The solar energy is far the largest source of energy available in earth and has attracted for milleniuns, the attention and interest for a rational use. The solar energy which strikes the Earth in one hour is bigger than the whole consume of energy in Earth in one year. Among the forms of transformation of this clean, renewable energy, the electrical conversion, photovoltaic cells, have the materials based on silicon or germanium semiconductors due to its technology and production processes involved still have a high production cost. An alternative to this solar cell is based on a synthetic dye and a semiconductor nanocrystalline TiO2, titanium dioxide, called DSC (Dye-Sensitized Cells), which have a cost of up to 80% lower than silicon cells

Análise de ciclo avançado com seqüestro de carbono

The energy is considered one of the most important elements in the human´s life providing the survival as well as the well being. Nowadays, the technologies destined to generate power burn fossil fuels which pour gases (carbon dioxide among them) that contribute to the global warming phenomenon. Several research groups and universities have been studying different methods for generating power with low carbon dioxide emissions, including the possibility of burning zero-carbon fuels. In this text, it has been put attention to the Advanced Zero Emission Power Plants (AZEP) which separate the CO2 (from the gases involved in the power generation), compress it, dehydrate it and store it in appropriate reservoirs. The goal of this study was to find a possible solution to produce CO from CO2, activated by solar energy; the reaction between CO and steam generates a syngas comprised of H2 and CO2, which can be separated by chemical and/or physical processes. The text also contains a study concerning the compressed air energy storage power plant (CAES) and come up with its modification to C[CO2]ES. This power plant stores CO2 directing it to a reverse combustion process to produce CO which is headed to a syngas reactor to produce CO2 and H2. Hydrogen is separated and carried to the thermal cycle to generate power with low carbon emissions

Sistema fotovoltaico interligado á rede eletrica no Campus da UNESP-FEG Guaratinguetá

Solar energy can be considered the largest source of energy available on earth and has attracted in recent decades, attention and interest for its rational use. The use of energy sources in a sustainable manner is essential to the survival of future generations, due to the scarcity of natural resources and their exploitation in a disorderly way. Studies related to the applications of renewable sources becomes then relevant, given its great importance as regards the conscious use of resources provided by nature, with the least possible impact on it. The present study presents an evaluation of generation potential and feasibility of implementing a solar photovoltaic connected to the grid and connected to the roofs of some buildings of the Faculty of Engineering of Guaratinguetá - FEG, to supply the demand of electric energy consumption on campus and attempting to inject a possible surplus power generation in local power grid, increasing network capacity and reducing peak loads

Análise da eficiência do cobre, alumínio e PVC como condutores hidráulicos em aquecedores solares

One of society concerns are preserving the environment and the growing energy demand. These two issues are in conflict since most of the energy used today in some way harms the environment. Then is essential to develop and implement ways to clean and renewable energy. In this way, solar energy stands out as a source of clean energy, renewable, abundant and acessible. Solar energy can be harnessed by photovoltaic cells or by solar collectors. The aim of this article is analysethe yield of the solar heather assembled with hydraulic conductive and plastic bottles using three different materials for hydraulic conductors, in order to compare these efficiences and analyze material which has the best cost-benefit in this type of application. The materials analyzed in this study were copper, aluminum and PVC. For this analysis were assembled three alike solar heaters using each one of these materials, and were done several series of measurements of the temperature water output to each heat with flow between 10 and 30 liters per hour. With these data we can analyze the yield and the performance of copper, aluminum and PVC in this application. So we can conclude that aluminum has a higher efficiency, followed by PVC, and the copper had the lowest efficiency. This behavior kept for all values of flow rates examined

Aplicação de painéis fotovoltaicos em residências: estudos de caso em Guaratinguetá e Sevilha (Espanha)

In this paper we discussed the possibility of installing a photovoltaic panel in a house in order to reduce electrical consumption. Brazil is a country with a huge solar resource and photovoltaic technology allows transforming solar energy into electricity, helping to decentralize energy production. To enlarge the field of view, the study compares with the equivalent in a Spanish city, discussing how the law favors the initiative of using this type of energy. It will be seen that, with the encouragement of the government, the project can be done because the installation is amortized over a reasonable period of time, about eight years in Spain and three in Brazil

Viabilidade técnica e econômica na utilização de um sistema fotovoltaico para alimentação de luminárias LED na Faculdade de Engenharia do Campus de Guaratinguetá SP

Solar energy can be considered the largest source of energy available on earth and has attracted in recent decades, attention and interest for its rational use. The use of energy sources in a sustainable way is essential to the survival of future generations, due to the scarcity of natural resources and their exploitation in a disorderly way. This academic work aims to bring a possible alternative to reduce the consumption of eletrical energy, at the University of Engineering – Campus of Guaratinguetá, through the use of a photovoltaic system interconnected to the LED bulbs. For this, the necessary data for the design of the photovoltaic system componentes and their acquisition costs were obtained and three differents configurations were developed to choose the one that bests fits the studied case, considering the return time of the initial investment (payback)

Aplicação do conceito de geração distribuída a um sistema fotovoltaico residencial

This work presents a study about distributed generation using photovoltaic systems in the context of smart grids. The characteristics of a Smart Grid and the several aspects this concept involves - distributed generation among them - are discussed. There are also examples of equipment, like smart meters, and of national and international projects. The specificities of distributed generation and the rules and standards necessary in this sort of installation are talked through with focus in the solar energy generation method. Regarding photovoltaic systems, the working principles of the panels are presented, along with its main electrical characteristics and the technologies available. Finally there is a study concerning the sizing of a distributed generation system that involves photovoltaic panels in a residential plant. An analysis of the costs and return of investment period is made about the specific case in consideration.

Chaveamento de cargas intermitentes usando sensor de corrente

Due to concerns about rational use of energy, several alternative technologies of power generation appeared, including the conversion of solar energy into electrical energy by photovoltaic panels. In low-income households, the refrigerator represents considerable impact on the electric bill, since it requires constant power given its use in food preservation. It is possible to reduce this share, with the use of an alternative energy source. This work presents a timed switching electronic system, which allows commercial equipment that is not affected by short interruptions in the power supply to use a photovoltaic panel as a source of alternative energy, which usually do not provide energy continuously. Switching is made automatically in case of low incidence of sunlight, and without any form of energy storage. Between each switching, there is a dead time without power supply, therefore preventing the use of synchronizers circuits between the photovoltaic panel and the public power grid. A circuit containing a 80C31 microcontroller is used to control the system’s switching. The photovoltaic panel’s voltage inverter is in H bridge configuration, and is also controlled by the microcontroller through Pulse Width Modulation, which makes use of preprogrammed tables to generate the control signals of the power transistors. Through the use of software simulations, the proposed system was tested, which is capable of supplying intermittent single-phase loads. The simulations indicates that the project developed in this paper can be assembled into a prototype and be tested under real operating conditions, as long as the scaling of components, the characteristics of the photovoltaic panel to be used, and the project involved load are taken into account

Estudo do desempenho de filmes de Ti02 como aceptor de elétrons e obtenção de fases puras de nanopartículas de Ti02: anatase e rutila, sintetizado por uma nova rota química

Pós-graduação em Ciência dos Materiais - FEIS

Singular value analyses of voltage stability on power system considering wind generation variability

Pós-graduação em Engenharia Elétrica - FEIS

Análise comparativa entre os aquecedores solares industrial e os construídos com garrafas pet e canos de pvc, cobre e alumínio

Este trabalho apresenta o uso de energia solar, para o aquecimento de água, através da análise de aquecedores solares industrial e os construídos com garrafas PET com canos condutores de água de cobre, alumínio e PVC, instalados no Centro de Energias Renováveis - CER, do Campus de Engenharia Guaratinguetá. A análise foi realizada com a ajuda de sensores Termopar, software - Contemp View Simple, para obtenção de dados, software Teamviewer para acesso remoto. Sendo feitas as medições concluiu-se qual é o aquecedor mais eficiente a ser utilizado, sempre tendo como objetivo o aproveitamento da energia renovável usando a radiação solar