| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 6.32 MB | Adobe PDF |
Authors
Abstract(s)
As superfícies envidraças representam uma parte importante da envolvente de um edifício, sendo zonas propícias à ocorrência de grandes trocas de calor. Com a tendência crescente da utilização de superfícies envidraças na construção dos edifícios, estas representam, cada vez mais, um contributo significativo na energia consumida. Assim, torna-se imprescindível avaliar a influência que o tipo de vidro tem nas diferentes orientações do edifício, assim como o efeito dos elementos construtivos. O presente trabalho pretende estudar o comportamento térmico do edifício, na estação de arrefecimento e de aquecimento, com recurso ao programa de simulação dinâmica EnergyPlus, recorrendo à modelação energética e geométrica realizada no OpenStudio e SketchUp, respetivamente. Apresenta-se o estudo de várias simulações considerando superfícies envidraçadas com coeficientes global de transmissão térmica e de fatores solar diferentes, de modo a avaliar a influência das duas características do vidro. A análise da influência do primeiro parâmetro foi obtida com valores de 5,7; 5,2; 1,4 e 1,3 W/m2.ºC para um alto fator solar (0,78) e para um baixo (0,23). A análise do fator solar considerou os valores 0,61; 0,47; 0,35 e 0,23, mantendo o coeficiente de transmissão térmica igual a 2,7 W/m2.ºC. Estas análises concluíram que, para o edifício em estudo, o vidro ideal tem um coeficiente de transmissão térmica de 1,3 W/m2. ºC e um fator solar de 0,35. Foi ainda estudado a influência dos elementos construtivos horizontais e verticais no comportamento térmico dos espaços, na orientação Este e Sul do edifício. Desta análise, observou-se os elementos de sombreamento horizontais permitem reduzir os ganhos no verão em 69% e 62%, respetivamente. Finalmente, foi realizado uma análise económica considerando 3 vidros duplos com coeficientes globais de transmissão térmica e de fatores solar diferentes. Com este estudo, pretende-se analisar os custos em investimento e energia necessária para climatização, associados a cada vidro.
The glazed surfaces represent an important part of the building’s envelope, being favorable zones for the occurrence of large heat’s exchanges. With the increasing trend in the use of glazed surfaces in construction of buildings, they can increasingly represent a significant portion of the building’s energy consumption. Thus, it’s essential to evaluate the influence that the type of glass has on the different orientations of the building, as well as the effect of the constructive elements. This work intends to study the thermal behavior of the building, in the cooling and heating season, using the dynamic simulation program EnergyPlus, using the energy and geometric modeling performed in OpenStudio and SketchUp, respectively. It presents the study of several simulations considering glazed surfaces with overall heat transfer coefficient and different solar factors, to evaluate the influence of the two characteristics of the glass. The analysis of the influence of the first parameter was obtained with values of 5,7; 5,2; 1,4 and 1,3 W/m2.ºC for a high solar factor (0,78) and for a low one (0,23). The solar factor analysis considered the values 0,61; 0,47; 0,35 and 0,23, keeping the thermal transmission coefficient equal to 2,7 W/m2.ºC. These analyses concluded that for the building under study, the ideal glass has a thermal transmission coefficient of 1,3 W/m2. ºC and a solar factor of 0,35. The influence of horizontal and vertical construction elements in the East and South orientation, on the thermal behavior of the spaces was also studied. From this analysis, the horizontal shading devices were observed to reduce summer heat gains by 69% and 62%, respectively. Finally, an economic analysis was carried out, consid ering 3 double glasses with global thermal transmission coefficients and different solar factors. This study aims to analyze the investment and energy costs necessary for climatization, associated to each glass.
The glazed surfaces represent an important part of the building’s envelope, being favorable zones for the occurrence of large heat’s exchanges. With the increasing trend in the use of glazed surfaces in construction of buildings, they can increasingly represent a significant portion of the building’s energy consumption. Thus, it’s essential to evaluate the influence that the type of glass has on the different orientations of the building, as well as the effect of the constructive elements. This work intends to study the thermal behavior of the building, in the cooling and heating season, using the dynamic simulation program EnergyPlus, using the energy and geometric modeling performed in OpenStudio and SketchUp, respectively. It presents the study of several simulations considering glazed surfaces with overall heat transfer coefficient and different solar factors, to evaluate the influence of the two characteristics of the glass. The analysis of the influence of the first parameter was obtained with values of 5,7; 5,2; 1,4 and 1,3 W/m2.ºC for a high solar factor (0,78) and for a low one (0,23). The solar factor analysis considered the values 0,61; 0,47; 0,35 and 0,23, keeping the thermal transmission coefficient equal to 2,7 W/m2.ºC. These analyses concluded that for the building under study, the ideal glass has a thermal transmission coefficient of 1,3 W/m2. ºC and a solar factor of 0,35. The influence of horizontal and vertical construction elements in the East and South orientation, on the thermal behavior of the spaces was also studied. From this analysis, the horizontal shading devices were observed to reduce summer heat gains by 69% and 62%, respectively. Finally, an economic analysis was carried out, consid ering 3 double glasses with global thermal transmission coefficients and different solar factors. This study aims to analyze the investment and energy costs necessary for climatization, associated to each glass.
Description
Trabalho final de Mestrado para obtenção do grau de Mestre em Engenharia Mecânica
Keywords
Superfície envidraçada Vidros Sombreamento Fator solar coeficiente de transmissão térmica Consumo energético Glazed surface Shading Solar heat gain Thermal transmission coefficient
Pedagogical Context
Citation
Vidigal, Guilherme Figueiredo - Análise da influência das superfícies envidraçadas na eficiência energética. Lisboa: Instituto Superior de Engenharia de Lisboa, 2022. Dissertação de Mestrado