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Simulação do comportamento térmico de edifícios com fachadas ventiladas

Authors: Carvalhal, Catarina Mourão;

Simulação do comportamento térmico de edifícios com fachadas ventiladas

Abstract

Com a entrada em vigor dos novos regulamentos na área de consumo energético de edifícios, torna-se cada vez mais importante a simulação do comportamento térmico destes. Existe ainda a necessidade de criar novas soluções construtivas, sendo uma delas o uso de fachadas ventiladas. As fachadas ventiladas podem ser definidas como um sistema de revestimento exterior de edifícios, cuja principal característica é a existência de uma caixa-de-ar em movimento, resultante do afastamento entre a parede do edifício e o revestimento. O principal objectivo do presente estudo é analisar o sistema construtivo em três regiões climáticas de Portugal: Bragança, Ovar e Évora. Para tal recorreu-se a dois programas de simulação, o EnergyPlus e o DesignBuilder. Com base nos resultados obtidos pelo EnergyPlus calcularam-se os consumos em Aquecimento e Arrefecimento e os respectivos Graus Dias. Observando os resultados, conclui-se que de uma forma geral a utilização de fachadas ventiladas reduz os consumos em Aquecimento e Arrefecimento nas três regiões climáticas. No entanto, é na estação de Arrefecimento que se verifica uma redução mais acentuada. Observou-se ainda que a colocação de um damper nas aberturas melhorava significativamente a prestação do edifício na estação de Arrefecimento. ABSTRACT: With the new regulations in the area of energy consumption of buildings, it is very important to simulate the thermal behavior of these. There is still the necessity of create a new constructive solution, being one of them the use of ventilated facades. The ventilated facades can be defined as an outer cover system of buildings, whose main characteristic is the existence of an air cavity in movement, resultant of the breakaway between the wall of the building and the covering. The main subject of the present study its to analyze the constructive system in three climatic zones of Portugal: Bragança, Ovar and Évora. For that, we used two programs to do the simulation, the EnergyPlus and the DesignBuilder. Attempting to the results obtained from EnergyPlus, we calculated the consumptions in Heating and Cooling, and the respective Degrees Days. Observing the results, we conclude that the use of ventilated facades generally reduces the consumptions in Heating and Cooling in the three climatic regions. However, it is in the Cooling Season that the reduction is more accented. When we use a damper in the openings, this can significantly improve the installment of the building in the Cooling Season.

Mestrado em Engenharia Mecânica

Country
Portugal
Related Organizations
Keywords

Edifícios, Engenharia mecânica, Ventilação, Eficiência energética

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
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