RESEARCH ON THERMAL CONDUCTIVITY DEPENDING ON THE PARTICLE SIZE COMPOSITION OF THE INSULATING LAYER

ABSTRACT. Issues related to energy saving are becoming increasingly relevant. It has been established that a particularly large amount of energy is lost from poorly insulated buildings. For this reason, intensive work is being done for the development of new strong, cheap, and beautiful thermal insulation coatings. In the presented work, experimental results on heat transfer processes through a layer with different grain size composition are examined and discussed. The rate of heat transfer is determined depending on the degree of filling of the heat-insulating volume and the type of material itself. Since the calculation of the total volume of the air voids, given an arbitrary shape of the filler, is a very difficult analytical task, the authors initially used materials with a spherical shape as the filler for the insulating layer. A distinction is made between the processes of heat transfer in the case of metal and glass spheres - materials with a considerably large difference in their thermal conductivity.