DECAT - Departamento de Controle e Automação
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/490
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Resultados da Pesquisa
Item Simulação termoenergética e lumínica de fachadas com brises no clima tropical.(2023) Dias, Luma de Souza; Souza, Henor Artur de; Gomes, Adriano Pinto; Caetano, Lucas Fonseca; Camargos, Bruno Henrique Lourenço; Tribess, ArlindoO uso da luz natural em edificações é uma importante estratégia de projeto pois minimiza o consumo de energia com iluminação elétrica e proporciona maior qualidade visual para seus usuários. Porém, essa estratégia pode resultar em ganhos térmicos excessivos e ofuscamento, causando desconforto térmico em ambientes de trabalho. No intuito de buscar uma combinação entre qualidade visual e bom desempenho termoenergético e lumínico, analisa-se nesse estudo a influência do tipo de brise-soleil e tipo de vidro, aplicados a uma edificação comercial com fachada envidraçada, localizada em regiões de clima tropical. Incluise na análise a edificação sem o uso do brise-soleil, como referência. São realizadas simulações computacionais com os programas Daysim e EnergyPlus considerandose a fachada oeste da edificação. Ao considerar o parâmetro tipo de vidro, os modelos que apresentam melhor comportamento são aqueles com vidro comum. Comparando-se os resultados entre os tipos de brises percebe-se que os modelos com brise vertical possuem valores mais elevados de taxa de radiação solar do que os modelos com brise horizontal, trazendo benefícios de maior luz natural ao ambiente. Os resultados, considerando-se as horas de conforto do usuário, indicam que o modelo de brise horizontal com vidro laminado na cor verde apresenta-se como o mais adequado, visto que possui o menor consumo de energia e mais horas de conforto. Ressalta-se, como contribuição do presente trabalho, a obtenção de modelos de brises mais adequados para projetos de brises aplicados em fachadas envidraçadas em regiões de clima tropical.Item Application of methodology for the adequacy of the electrical motor's power sizing : permanent and transient analysis.(2018) Rêgo Segundo, Alan Kardek; Oliveira Filho, Delly; Queiroz, Josué Morgan; Martins, José Helvecio; Monteiro, Paulo Marcos de BarrosThe suitability of the motive force contributes to the efficient use of electrical energy. On the other hand, the inadequate size of electric motors is directly connected to increased investment and running costs. This article presents the theory and mainly the application of a methodology for the adequacy of the motive power. The research was conducted at the Federal University of Viçosa dairy factory. This methodology consists in measuring motor rotation, acquiring technical information from the manufacturer’s manual, and identifying the type of motor load. In addition, it uses the linearization method to estimate the resistance torque in steady state. This step is achieved without the need for using additional equipment or sending the motor to a laboratory for measuring the torque. In this sense, the studies can be made during the production process. Thus, this relevant methodology has the advantage of allowing the studies to be carried out at the agro-industry facilities. After getting all the information described above, it was possible to determine whether each motor at the factory was oversized. Then, the suitable motor was selected according to the load type. The application of the methodology described herein could provide around 50.6% savings in the monthly electricity costs at the dairy factory, and an attractive internal return rate.Item Study of the electricity consumption reduction of a compressed air system : the case of a steelmaking company.(2017) Silva, Washington Luís Vieira da; Souza, Leonardo Carvalho Oliveira de; Bortolaia, Luis Antônio; Paula, Milton Realino de; Leal, Elisângela MartinsThis work aims to reduce the energy consumption and thus increase the availability of blast furnace compressors of a steelmaking company, located in Alto Paraopeba region in Minas Gerais state, Brazil, through the elimination of waste points in the compressed air distribution. In order to develop this work, an ultrasound test in the compressed air line was performed to identify and quantify leaks in the flow. Once the leaks were identified, they were eliminated through corrective maintenance and improvements, and then the energy consumption scenarios before and after the improvements were compared. As a result, the average monthly electricity consumption in the reporting period decreased by 57.2%. In addition, one compressor was set aside in stand-by condition, as in the original plant. Thus, one can prove the efficiency in eliminating of waste points in compressed air distribution, since the reduction of energy consumption is important for the company to remain competitive, as the cost of electric energy affects the final price of the final products.Item Influence of natural and artificial light on structured steel buildings.(2015) Castanheira, Eduardo Cunha; Souza, Henor Artur de; Fortes, Márcio ZambotiOptimum possible use of natural light is a factor that must be considered in new construction projects. Particularly, construction structuralized in steel needs research that supports the designers in devising proposals. In this work, the author considers references for lighting projects for construction structuralized in steel, using a methodology built from the compilation of several variables that directly interfere in the development of architectural projects both in residential, commercialand/or services buildings. It takes in to account the use of all natural light potential and new lamp technologies, which confronts the demands of energy economy that surround the subject of energy consumption reduction in construction focused on environmental sustainability. Some points related to the integration between lighting and architectural projects also are mentioned. To conclude this work, two project guide lines (methodological approaches) for support in the delineation of projects are presented considering three distinct and interconnected approaches: environmental, normative and architectural. The guide lines for the proposals attempt to efficiently handle diverse design aspects that can contribute to more adequate solution sinall sectors that involve creating projects and, executing them. Thinking about the project from a systematic point of view taking in to account the contribution of each sector improves project quality.