EM - Escola de Minas
URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/6
Notícias
A Escola de Minas de Ouro Preto foi fundada pelo cientista Claude Henri Gorceix e inaugurada em 12 de outubro de 1876.
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Resultados da Pesquisa
Item Análise de estratégias para mitigar os efeitos de pontes térmicas no sistema de construção Light Steel Framing.(2023) Martins, Paula Daniela; Gomes, Adriano Pinto; Lage, Carmem Miranda; Gomes, Adriano Pinto; Lage, Carmem Miranda; Caetano, Lucas Fonseca; Mendes, Júlia CastroNos últimos anos o número de construções em Light Steel Framing (LSF) cresceu expressivamente no Brasil. E, apesar de ser um sistema de construção com várias vantagens, como maior sustentabilidade quando comparado com o sistema de construção convencional em concreto armado e alvenaria, se mal projetadas, as edificações podem ser penalizadas com os efeitos das pontes térmicas. As perdas e ganhos de calor, originadas pelas pontes térmicas, podem levar à degradação do fechamento vertical e a maiores gastos com energia para aquecimento e resfriamento do ambiente interno. Além disso, por ser um método construtivo importado, é imprescindível que análises sejam feitas para o clima brasileiro. Assim, o presente trabalho consiste na avaliação dos efeitos das pontes térmicas em um ambiente condicionado artificialmente, considerando 9 configurações construtivas ao longo das 8 zonas bioclimáticas do Brasil. Ademais, avalia-se o impacto de estratégias de mitigação das pontes térmicas, como a aplicação de thermal breaks, variação da geometria da mesa do perfil metálico e aplicação do sistema ETICS, utilizando o software THERM. Os resultados apontam que a construção fria, cujo isolamento está situado no interior da parede do sistema LSF, apresenta o pior desempenho em todas as zonas bioclimáticas, tanto para a condição de temperatura mínima quanto máxima. Assim, as construções híbrida e quente são as mais indicadas para o clima brasileiro. As análises apontam, também, que a estratégia que mais impacta positivamente no desempenho térmico da envoltória é a aplicação sistema ETICS, o qual chega a reduzir em 47% o valor da transmitância térmica do fechamento, quando comparado com a construção sem o sistema.Item Heat flow avaliation in closing system in light steel framing.(2020) Muzzi, Thassiana Armond; Gomes, Adriano Pinto; Souza, Henor Artur deThe use of steel in construction appears as an alternative to change the overview of this sector, contributing to increase productivity, reduce waste and the running time of construction. The Light Steel Framing System (LSF) introduced in Brazil in the late 1990s is going through a process of technical development and acceptance in the domestic construction market, but there are still shortcomings in the design, detailing and implementation of complementary systems of closing and also in its thermal performance. This study covers an analytical approach in which simplified methods of calculating resistance and thermal transmittance and a numerical approach are presented, using the computer program ANSYS (version 15) for checking and comparing of these methods. It is considered the closing of multi-layer compound in the outer layer by cement board and the inner layer of gypsum board, brokered by fiber glass insulation, with studs formed by C-sections profiles in galvanized steel. Among the simplified methods discussed in analytical analysis, the method of Isothermal Plans showed the lowest value of thermal resistance and thus the highest thermal transmittance and heat flow. In relation to the numerical analysis, the results showed that the heat flow is equal to a value around 49% higher than the heat flux value for a closing without the presence of steel profile. The method of Modified Zone showed the smallest difference in the value of the equivalent thermal resistance in comparison of analytical and numerical analysis.Item Impact of thermal bridging on the performance of buildings using Light Steel Framing in Brazil.(2013) Gomes, Adriano Pinto; Souza, Henor Artur de; Tribess, ArlindoThe Light Steel Framing building technology was introduced in Brazil in the late 1990s for the construction of residential houses. Because the design systemwas imported from the United States and is optimised to work well in that temperate climate, some modifications must be made to adapt it for the Brazilian climate. The objective of this paper was to assess the impact of thermal bridging across enclosure elements on the thermal performance of buildings designed with Light Steel Framing in Brazil. The numerical simulation program EnergyPlus and a specific method that considered the effects of metallic structures in the hourly simulations were used for the analysis. Two air-conditioned commercial buildings were used as case studies. The peak thermal load increased approximately 10% when an interior metal frame was included in the numerical simulations compared to non-metallic structures. Even when a metal frame panel was used only for vertical elements in the facade of a building with a conventional concrete structure, the simulations showed a 5% increase in annual energy use.Item Influência da inércia térmica do solo e da ventilação natural no desempenho térmico : um estudo de caso de um projeto residencial em light steel framing.(2011) Souza, Henor Artur de; Amparo, Lucas Roquete; Gomes, Adriano PintoThe light steel framing technology requires some design adaptations in order to have an adequte thermal performance in Brazil, since it was imported from the USA, In this study, the thermal performance of a light steel frame single-family house, in Belo Horizonte, state of Minas Gerais, was evaluated considering some natural ventilation strategies and the influence of soil inertia. To determine the model’s thermal behaviour, the EnergyPlus simulation program was used. The following stages were carried out: characterization of the structure, its typical exposure to the weather; occupants’ profile and their demands; configuration of closing system; and the evaluation of the building’s thermal comfort conditions and to what extent they meet existing standards. The conclusion was made that a suitably ventilation system could significantly improve the building’s thermal performance, if the local climatic conditions are duly taken into account. Likewise, depending on the land plot topography and the design characteristics, the influence of the soil thermal inertia, when associated to suitable ventilation and shading strategies, could be helpful to improve the design thermal performance.