Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Dynamic effect of balcony thermal bridges on the energy performance of a high-rise residential building in Canada
Highlights Dynamic effect of balcony slab on energy performance of a high-rise residential building. Two modeling methods, i.e. dynamic 3D modeling vs equivalent U-value, investigated. Equivalent U-value method underestimates annual heating load by up to 15%. Implementation of thermal breaks in balcony reduces the dynamic effect.
Abstract Typically the effect of thermal bridges on the energy performance of buildings is taken into account by implementing an average U-value in 1D whole building energy simulation program, which is referred to as the equivalent U-value method. This treatment accounts for the effect of thermal bridges on the overall thermal transmittance of envelope details, while their thermal inertia effect is ignored. In this paper, the dynamic effect of balcony slab as thermal bridges on the energy performance of a high-rise residential building is investigated by comparing the annual space conditioning loads obtained by the equivalent U-value method to that obtained from 3D dynamic modeling of the balcony junctions implemented in WUFI Plus program. The simulation results show that the equivalent U-value method underestimates the annual heating loads by 2.8–4.4% for the building as-designed. With the increase of balcony portion and better insulated walls, the difference in annual space heating loads modeled using these two methods is increased to 8.6–15.2%. With the implementation of balcony thermal break the annual heating loads are reduced by 8.8–25.7% and the difference between these two modeling methods is also reduced to 1.9–11.5% for the cases investigated.
Dynamic effect of balcony thermal bridges on the energy performance of a high-rise residential building in Canada
Highlights Dynamic effect of balcony slab on energy performance of a high-rise residential building. Two modeling methods, i.e. dynamic 3D modeling vs equivalent U-value, investigated. Equivalent U-value method underestimates annual heating load by up to 15%. Implementation of thermal breaks in balcony reduces the dynamic effect.
Abstract Typically the effect of thermal bridges on the energy performance of buildings is taken into account by implementing an average U-value in 1D whole building energy simulation program, which is referred to as the equivalent U-value method. This treatment accounts for the effect of thermal bridges on the overall thermal transmittance of envelope details, while their thermal inertia effect is ignored. In this paper, the dynamic effect of balcony slab as thermal bridges on the energy performance of a high-rise residential building is investigated by comparing the annual space conditioning loads obtained by the equivalent U-value method to that obtained from 3D dynamic modeling of the balcony junctions implemented in WUFI Plus program. The simulation results show that the equivalent U-value method underestimates the annual heating loads by 2.8–4.4% for the building as-designed. With the increase of balcony portion and better insulated walls, the difference in annual space heating loads modeled using these two methods is increased to 8.6–15.2%. With the implementation of balcony thermal break the annual heating loads are reduced by 8.8–25.7% and the difference between these two modeling methods is also reduced to 1.9–11.5% for the cases investigated.
Dynamic effect of balcony thermal bridges on the energy performance of a high-rise residential building in Canada
Baba, Fuad (Autor:in) / Ge, Hua (Autor:in)
Energy and Buildings ; 116 ; 78-88
24.12.2015
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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