Comparação da eficiência térmica de trocadores de calor no laboratório de sistemas térmicos da Faculdade de Engenharia

This work aims to verify and compare the efficiency of heat exchangers used in the thermal systems laboratory at Faculdade de Engenharia do Campus de Guaratinguetá - UNESP. Basically, it has been studied two types of heat exchangers: plate type, operating in parallel flow and counter-flow, shell and tube type and also operating in parallel flow and counter flow. Initially it has been presented the didactic equipment and procedures for use of these heat exchangers in the proposed experiments. With the results obtained from the experiments, comparisons were made in order to define the behavior of the heat exchangers regarding some variables. In the study, one comes to the conclusion that the results from shell and tube type of heat exchanger, used in the thermal systems lab, are superior in all conditions analyzed

Eficiência energética em ar condicionado e refrigeração através da aplicação da termoacumulação

The use of refrigeration and air conditioning systems is of fundamental importance when it comes to air-conditioning of environments. Also important is the use of electricity for equipments’ operation related to these systems. Due to high cost of charging for this type of energy, factors economy and efficiency occupy key roles among design parameters of a system. One of the ways to get this economy is the use of a technique called thermal storage, or cold storage, which intends to move the required loads during peak time and also their equalizing, so that the energy is transferred from the peak time to non-peak time, thereby reducing the cost of energy consumed. Cold can be stored in the form of ice or ice water. This work aims to perform a technical-economic analysis of a mall located in Vale do Paraíba checking the feasibility of deploying a thermal storage system to achieve an economy in the cost of the energy used by the establishment. Through the parameters measured by the concessionaire of energy we can get the values of energy demand and power consumed, which will serve as basis for calculation for the study. The results obtained allow the development of two alternative proposals to the current configuration, one chosen by the criteria and results presented by technical-economic and energy analysis

Estudo da eficiência de reforços estruturais em vigas de concreto armado com o uso de chapas de aço coladas com resina epóxi: uma análise qualitativa

In civil engineering, a structure is the whole sustainment of a construction and, thus, it is important that it remains intact throughout its lifetime. An engineering construction must last for decades without losing its functionality. However its purpose may be altered and several times the original structure does not meet the new needs of use. Still, in new buildings, the functionality is altered due to possible flaws in execution and the structure, invariably does not reach the desired solicitation needs. In cases like this, the commonly adopted solutions are, basically, the demolishment followed by the reconstruction of the desired mold or the structural reinforcement. This second option, for long years, has not been put to practice due to certain factors such as the high costs for its implantation, use of inadequate reinforcement execution techniques, and the culture of people involved in the area regarding its use and, in this case, the option would always be the reconstruction. Thoughtout the years, some techniques were developed to allow the execution of structural reinforcements with low costs and in efficient ways. An interesting, fast, efficient and economical technique is the structural reinforcement through metal sheets put together with epoxy resin that can be applied in beams, slabs and pillars. In the present work the different behavior of beams reinforced with this technique. Steel is a very recommended material for these reinforcements due to its characteristics related to traction, compression and the effectiveness of the technique related to its cost. For the attachment the epoxy resin is recommended, since it allows the joining of two materials, in this case, steel and concrete. The efficiency of this union is so considerably high that it rarely produces any flaws in adherence and, normally, when it happens it is due to problems in the execution process, not in the union of materials

Verificação da eficiência da metodologia Seis Sigma na redução da divergência de estoque em uma indústria de condutores de fluídos

This work was developed in order to reduce the discrepancy found between the stock data of an item in the system and the amount found physically in stock in the company presented on this study case. Therefore, this paper makes a study on system of information that can assist in the collection, control and manipulation of data regarding the company's stock. It is very important to do the inventory management, so we can control the level of this sub-product to meet sales orders and production. In the study discussed below, we used the Six Sigma methodology to identify points that had flaws in the process and thus improve their work where the results show grater process control and provide a reliable database to the point where no further problems of lack of components in stock

Análise preliminar da eficiência de sabonetes em barra frente a candida spp potencialmente patogênica ao organismo humano

O presente trabalho foi elaborado e realizado a fim de se demonstrar a importância da lavagem das mãos no cotidiano, uma vez que mãos humanas podem ser consideradas fonte de diversos agentes etiológicos de doenças que podem comprometer a saúde principalmente de pacientes debilitados. Para tanto, foram aplicados testes de sensibilidade a sabonetes utilizando-se métodos normatizados e validados pelo CLSI (Clinical and Laboratory Standartds Institute) e, por fim, foi verificado o efeito dos mesmos sobre biofilmes formados a partir de espécies e cepas fúngicas conseguidas por meio de lavagens das mãos de voluntários. As amostras utilizadas foram sabonetes em barra adquiridos do comércio, um de formulação bactericida (com adição de extrato de própolis) e outro de formulação comum. Foram realizadas lavagens com os sabonetes-amostra e água destilada, dentro de fluxo laminar, onde foi possível recolher a água usada no enxágüe. A partir do plaqueamento (em meio Sabouraud-dextrose com cloranfenicol 0,05%) das mãos voluntárias sem assepsia prévia, da água de lavagem e das mãos lavadas foram obtidas culturas fúngicas. Essas culturas foram selecionadas de acordo com a viabilidade de isolamento, e então foi feita a identificação das espécies. Através da triagem pelo método de identificação por ChromagarTM Candida, foi possível identificar que duas colônias obtidas das lavagens das mãos foram identificadas como C. krusei e C. albicans. C. albicans ainda pôde ser confirmada... (Resumo completo, clicar acesso eletrônico abaixo)

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

Eficiência das resinas XAD4 e C18 na extração de compostos mutagênicos presentes em efluente de refinaria de petróleo para a realização do Teste de Ames

Não disponível

Uma análise da eficiência de uma transmissão CVT

This undergraduate thesis evaluates the effects of temperature variation of the air inside the CVT gearbox on the performance of a Continuously Variable Transmission (CVT). The CVT used in the tests was manufactured by Gaged Engineering (GX9 model) and is currently used in a Baja prototype. It’s a mechanically operated CVT, which the movement of the pulley plates varies according to the drive shaft rotation, shifting the belt along the diameter, and varying the transmission ratio. The purpose of this work is to analyze the change in the slip factor, coefficient that compares the variation between the actual transmission ratio and the ratio of geometric transmission, and its correlation with the power variation. A test bench was built and some tests were performed, indicating that was possible to achieve output power ratios of 1.75 [ℎ

Estudo da viabilidade técnica/econômica no aumento da eficiência energética sustentável aplicada à residência unifamiliar

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação da eficiência do sistema de tratamento de efluentes de frigorífico: um estudo de caso em Rio Claro/SP

Não disponível

Análise do consumo de energia elétrica e da eficiência energética em uma indústria de processamento de madeira

In the industries of wood processing (sawmills), where timber is sawn in equipment such as band saws, circular saws, trowel, thicknessers, among others, that mechanically transform this resource and use of electric motors, which are not unusually poorly scaled working or overloaded, often a factor that is not found in these industries and has fundamental importance in the production process is energy efficiency that is achieved by both technological innovation and through all the practices and policies that aim to lower energy consumption, lowering energy costs and increasing the amount of energy offered no change in generation. For both during the design of an electrical installation, both overall and in various sectors of the installation, investigations are necessary, considerations and uses of variables and factors that put into practice the theme of energy efficiency. Therefore, in this paper, these factors were calculated and analyzed for a wood processing industry (sawmill) in the municipality of Taquarivaí - SP, namely: active power, power factor, demand factor and load factor. Where they were small in relation to the literature, these events that occur when devices are connected at the same time and due to the conditions of processing the wood, where the engines have large variations in electricity consumption during the unfolding of the same, due to efforts with the load and idle moments between each machining operation in the equipment

Aplicação do regulamento técnico da qualidade do nível de eficiência energética em edificações residenciais

The research shows that increasing the consumption of energy by households is growing rapidly and without adequate planning, due to population growth and therefore an increase in energy consumption. With the current concerns of sustainability and energy efficiency by industry, there is the need to prove to population that there are many ways to incorporate sustainable practices to their daily lives, starting from by their own residence. The quality certification of the energy efficiency level in residential buildings, shows how one can influence and improve housing issues on sustainable actions as rooted in our country

Modelagem para identificação de indicadores de eficiência energética para edificações e plantas industriais

Pós-graduação em Engenharia Mecânica - FEG

Desenvolvimento de um smart meter: um estudo sobre eficiência energética através das redes inteligentes

Pós-graduação em Engenharia Elétrica - FEB

Proposta de metodologia para aplicação de eficiência energética em uma usina hidrelétrica

Pós-graduação em Engenharia Mecânica - FEG