A semi-scale device is employed for the analysis of hygrothermal performance of a building envelope with indoor thermal insulation in the conditions of different climate. The tested building envelope consists from the exterior to the interior of a brick wall, water vapor retarder on the cementitious basis, hydrophilic thermal insulation on the mineral wool basis and indoor water vapor permeable plaster. The measured results show from the hygrothermal point of view a reasonably good function of the system during the critical winter period. The experimental situation is then modeled using the computer code Delphin 4.3 and computational data compared with measurements. The observed differences are discussed and recommendations for the improvement of computer modeling process are given.
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