Evaluation of thermal conductivity and stability of thermal insulation materials for buildingsbased on the steady-state heat flow method

Purpose. Determination of the thermal conductivity and stability of thermal insulation materials using the steady-state heat flow approach, which allows for assessing the materials' efficiency in heat retention, their durability, and resistance to external environmental changes– key factors for improving the energy efficiency of buildings and structures. Methods. To achieve the stated objective, the authors, based on an analysis of scientific literature and mathematical approaches to assessing the thermal conductivity and stability of thermal insulation materials, applied the steady-state heat flow method, which made it possible to determine their thermal conductivity coefficient under various temperatures and operating conditions, as well as to evaluate their mechanical stability and changes in properties under prolonged heating and cyclic thermal loading. Results. The feasibility and rationale for the development of thermal insulation materials have been substantiated, thermal conductivity values have been determined, mechanical stability under heating and thermal cycles has been assessed, the composition has been optimized to ensure low thermal conductivity and strength, and recommendations for their effective application in construction and industry have been developed. Originality. Consists in the systematization and scientific substantiation of the implementation of technologies for the development of thermal insulation materials, taking into account the impact of temperature and operating conditions, the assessment of their mechanical stability under prolonged heating and cyclic thermal loading, the establishment of the relationship between the variation of maximum equivalent stress values and the height of the studied structures, as well as the optimization of material composition to achieve the best balance between low thermal conductivity and high mechanical strength. Practical implication. The development of mathematical approaches for evaluating the effectiveness of thermal insulation materials, which ensure increased energy efficiency of buildings and structures, reduce energy consumption and heating costs, as well as possess high mechanical stability and durability under variable temperature conditions, making them suitable for widespread use in construction and industry.