engleski

Thermal bridge assessment in prefabricated ventilated façade systems with recycled aggregates

Despite numerous national regulations, it has been shown that the traditional practice when insulating building envelope is insufficient if not enough attention is given to thermal bridges. Heat losses through thermal bridges are much higher than the heat losses through the surrounding area. Because of that, the thermal bridges are accompanied by lower surface temperatures, resulting in the higher risk of water vapour condensation and the formation of mould, and ultimately building damage. Therefore, much attention should be given to the design of thermal bridges and ultimately, its construction. This paper deals with the impact of thermal bridges on the outer building envelope of the ventilated façade system of the first ECO-SANDWICH® house in Croatia. The house is built in Koprivnica as part of the Green Zone project. It is designed according to the standards for passive houses using innovative, ventilated Eco-sandwich® façade panels, designed at the Faculty of Civil Engineering, University of Zagreb. All the details in this paper are modelled as two -dimensional, according to the HRN EN ISO 10211 standard. The numerical calculation is carried out by software specialised for the heat flow and thermal bridge calculation – Flixo. The output result, linear heat transfer coefficient (Ψ), which quantifies the impact of linear thermal bridges on the one -dimensional heat flow, is analysed by variation of parameters, such as thermal insulation thickness. Finally, the numerical results are compared with the results obtained by default values of linear thermal bridges according to the standard HRN EN ISO 14683. This comparison is made to show the error between the results obtained by the numerical calculation and the default values, which are typically taken in the traditional calculation of heat losses in buildings.

Thermal bridges ; Eco -sandwich ; linear thermal transmittance ; thermal transmittance ; Flixo

nije evidentirano