THERMAL PHYSICAL CHARACTERISTICS DYNAMICS IN THERMAL INSULATION MATERIALS OF BUILDINGS FACADE

In Ukraine, about 80 % of the existing housing stock was built with low thermal resistance of building envelopes, which leads to excessive consumption of energy resources. This necessitates thermal modernization of buildings to improve their energy efficiency. The article investigates changes in the thermal and physical characteristics of thermal insulation materials as part of building envelopes under operating conditions. The influence of the service life on the thermal properties of various thermal insulation materials is analyzed. The aim of the study is to experimentally analyze changes in the thermal and physical characteristics of heat-insulating systems common in construction throughout their service life. Traditional thermal insulation materials, such as expanded polystyrene, polyurethane foam, foam glass and basalt wool, are considered. Expanded polystyrene is an affordable and effective insulation material, but its main disadvantage is flammability. Foam glass, although a non-combustible material, requires significant energy inputs at the production stage. To evaluate the thermal and physical properties of different options for thermal insulation of wall enclosing structures, the thermal modernization of an administrative building was carried out and a set of measures for analyzing heat losses was developed. Experimental data obtained during the long-term operation of thermal insulation systems were compared. The experimental data on the distribution of heat flux density and temperature fluctuations in the section of the wall envelope insulated with different thermal insulation materials were analyzed and processed. The values of thermal conductivity coefficients for the studied thermal insulation materials were calculated. Also, the values of the thermal conductivity coefficient of thermal insulation materials were compared with the normative values and with the results of research for previous years. Bibl. 17, Fig. 6, Tab. 1.