The current energy situation has highlighted the urgent need to renovate the existing building stock. Based on previous data on buildings with high energy consumption, we have identified the two most common assemblies that are frequently used. Using U-Wert, we upgraded the two basic assemblies with 8 different wood-based assemblies that can be fully manufactured in the factory and help reduce energy losses. U-Wert allowed the analysis of temperature and moisture development in each model. Based on the results, we identified four assemblies for which we created physical models and measured their thermal characteristics. They were mounted on a chamber simulating outdoor conditions (8 °C and 85% RH). Throughout the model, we measured the temperature, heat flux and humidity inside the air-conditioning chamber. We found that thicker insulation and a model with more wood resulted in higher temperature attenuation and consequently lower heat flux. The highest temperature lag was observed for assembly 3 with CLT panels (13.5 h). The heat flow was slower in the centre of the models than on the sides of the wood frame, where there was more wood and consequently more heat conduction. Comparing the measured data of the samples with the simulated U-Wert data, the deviations were minimal. The U-Wert values were also slightly higher than the actual measurements. The proposed solutions could be considered in the renovation of the building stock, and are particularly suitable for the renovation of larger buildings.
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