DECAT - Departamento de Controle e Automação

URI permanente desta comunidadehttp://www.hml.repositorio.ufop.br/handle/123456789/490

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2011 - 20202

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Autor: search.filters.author.Gomes, Adriano PintoAssunto: search.filters.subject.Simulação numérica

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    Heat flow avaliation in closing system in light steel framing.
    (2020) Muzzi, Thassiana Armond; Gomes, Adriano Pinto; Souza, Henor Artur de
    The 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.
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    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 Pinto
    The 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.