Fallstudie zum Trocknungsverhalten von Außenwandkonstruktionen aus Porenbeton mit Wärmedämmverbundsystem

Abstract

nents. In addition to that a guideline was written. It contains the minimum time that is necessary to dry all components of the buildings for the most situations. For the investigations a test bench had been built. Different scenarios of the constructions could be tested under real climate conditions of the locations Košice. The scenarios were investigated and the measured data was analysed. The analyses were executed with the simulation program WUFI. The results show that the cellular concrete in combination with the EPS-System needs 28 months to reach the reference humidity w80. The moister effects the u-value of the construction in a negative way. The heat resistance is lower because of the wetness. The averaged influence of the humidity on the effective u-value from the calculated u-value was 20 % in the second heat period. In the third heat period the effective u-value was more than 5 % worse as the calculated. The orientation of the construction and the different thicknesses have a very low influence on the drying process. It is not significant. When mineral wool is used instead of EPS the drying time can be reduced around 50 %. Numeric analyses show that after two months of drying the cellular concrete in combination with EPS reduces the water content by 33 %. When the EPS is installed five months later, the drying time can be reduced by 14 months. This results the same drying time as the mineral wool construction.

The Influence of the Initial Condition in the Transient Thermal Field Simulation Inside a Wall

“…The moisture content of the material aggravates its thermal conductivity coefficient and specific heat capacity. The simulation tool considers the comprehensive heat-air-moisture transport and allows for the inclusion of the regular initial condition, irrespective of whether the moisture, temperature or both may achieve the better compliance of the simulation and experimental onsite measurement [26,27].…”

“…Numerical analysis of the thermal field validated by experimental measurement is used to recognize the true heat behavior and moisture transfer in different kind of structures. Those analyses have been published in literature [22][23][24][25][26][27].…”