Abstract
The paper makes an in-sight analysis of four actual steel-intensive envelope solutions existing on the market adaptable to steel structural systems. The solutions enable flexible modular construction, fast fabrication and erection times and easy disassembling. The analyses consider the heat transfer analysis including phase shift, amplitude attenuation and temperature amplitude ratio and the energy balance analysis. Considering the sustainability approach, the study is completed by an environmental impact analysis on Life-Cycle, by considering the production and end-of life stages. Although the selected systems from similar thermal resistances, the results show a certain variation of analysed parameters such as amplitude attenuation and temperature amplitude ratio (TAV). The energy balance analysis shows that the heating, solar gain and hot water preparation are responsible for the supplied energy. The emitted house energy break-down is almost equally shared among transmission, ventilation and sewage energies. The Life-Cycle Assessment (LCA) analysis proves that the end-of-life of the systems play an important role in the environmental impact of analysed systems, reversing the initial ranking of systems.
Highlights
As proven by several studies [1,2,3], the building sector of today is responsible for an important share of the global energy as well as total emissions and wastes, the percent raising up to 40 to 50% of the total amounts
Other factors involved in the energy balance proved to be important, such as: phase shift: the time after which the peak afternoon temperature reaches the interior side of the component; amplitude attenuation: the attenuation of the temperature wave when passing through the façade system: a value of 10 implies that the temperature on the outside varies 10x stronger than on the inside, e.g. outside 15-35 °C, inside 24-26°C; temperature amplitude ratio (TAV): the reciprocal of the amplitude attenuation
The four systems were chosen on the basis of similar thermal resistance values (U-values)
Summary
As proven by several studies [1,2,3], the building sector of today is responsible for an important share of the global energy as well as total emissions and wastes, the percent raising up to 40 to 50% of the total amounts. The envelope system of a building covers the entire surface of the building and is a complex matrix formed by wall, door and window openings, roofing systems. Each of these systems should possess different characteristics, in accordance to modern requirements requested by norms, in order to offer an adequate interior comfort. Considering the sustainable building concept [4], steel thin-walled cold-formed structures represent a very attractive structural system, as this combines the prefabrication, lightness, fast erection and reuse or recycling [5]. The study presents an analysis of four envelope solutions existing on the market adaptable to a thin-walled coldformed steel structural systems. The study is completed by a life-cycle environmental analysis considering the production and the end-of-life stages
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