The correct design of the building envelope is vital in the construction industry, as it enables the durability and long life of the building at the same time as the energy efficiency of the building, reduces energy consumption, prevents the growth of microorganisms, regulates the temperature and humidity of the premises and thus affects the quality of the internal environment. In Slovenia, due to the climatic characteristics, we focus primarily on winter conditions when designing building envelopes. For this reason, the structural assemblies are adapted to winter conditions by choosing suitable materials, the position of the vapour barrier, which must be located on the inner or warmer side of the thermal insulation layer and the appropriate thickness of the thermal insulation. As part of the bachelor thesis, we were interested in how the cooling of rooms in the warm part of the year affects the hygrothermal response of construction details mainly designed for winter operating conditions. With the Ubakus software tool, we analysed four external walls and four pitched roofs. We were interested in their surface temperature, relative humidity of the surface and diffusion of water vapour through the construction detail. When determining the boundary conditions, we focused on cooled residential and industrial buildings, which are expected to have high humidity. We found no significant differences between the temperatures of the internal surfaces and the relative humidity between the cases. However, the amount of formed condensate and its calculated drying time differed. This appeared in the vapour barrier layer in all cases, due to its incorrect position in the construction. The analysis results showed us the importance of adapting the design of structural assemblies for the intended use of the space.
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