External walls have a great influence on the thermal and humidity conditions in buildings as well as on the possibility of reducing energy consumption. While the structural and material aspects of walls and windows are well known, obtaining a tight connection to reduce thermal bridges between the window and walls still poses a significant problem. Therefore, a new window installation system proposed by the authors, eliminating linear and point thermal bridges at the window-to-wall interface, opens a pathway for lowering energy consumption in buildings and increasing thermal comfort and thermal efficiency. To prove the effectiveness of this system, numerical and experimental analyses of heat flow through an outer wall with a window were carried out. The numerical analyses were performed using the TRISCO software package. It was shown that the proposed solution eliminated the occurrence of linear thermal bridges at the window-to-wall interface (a linear heat transmittance coefficient ψ ≈ 0.007, which meets the requirements of the passive house, was obtained). Thus, heat losses were reduced by nearly eight times compared to conventional installation systems. Numerical calculations were experimentally verified.

Minimization of the demand for energy which is needed to heat a building is an important issue of a sustainable development policy, therefore mutual exchange of heat between the interior of the building and its external environment through a window as well as its mounting parts is one of the most important issues of energy calculations.In the paper, the SCM (Quick Warm Mounting) sill beam used as a support for a window installed in a thermal insulation layer is analyzed. Due to the fact that titanium has a more favorable specific strength, lower coefficient of thermal conductivity and much higher resistance to corrosion than steel, the currently used steel reinforcement of the SCM beam was replaced by a titanium one. Numerical calculations were performed using the ADINA System, which is based on the finite element method (FEM). The process of heat exchange between the interior with the constant temperature of 20°C and the external environment with the constant temperature of -20°C is analysed. The temperature distribution in the wall, the dew point temperature as well as corrosion and economical aspects associated with the use of titanium profiles are discussed.