METHOD OF DETERMINING HEAT CONDUCTIVITY COEFFICIENT OF HEAT-INSULATING COATINGS BASED ON HOLLOW MICROSPHERES USING THERMAL IMAGER

摘要

FIELD: physics.;SUBSTANCE: invention relates to studies and analysis of thermophysical properties of materials and can be used in determining heat conductivity coefficient of heat-insulating coatings based on hollow microspheres. Disclosed is a method of determining heat conductivity coefficient of heat-insulating coatings based on hollow microspheres, comprising use of optoelectronic devices - thermal imagers, having adjustment of radiation coefficient and reflected temperature of RTC to obtain thermograms of temperature distribution on analysed surfaces with applied heat-insulating coating based on hollow microspheres. According to the disclosed method, the radiation coefficient parameter is pre-set by value of 0.98–1, with the temperature difference inside and outside the room of the test enclosure of not less than 25–30 °C. Calculation of thermal conductivity coefficient based on thermograms of thermal imager measurements is carried out by formula:; ;where λ_hc is heat conductivity coefficient of heat-insulating coating based on hollow microspheres; δ_hc is thickness of heat-insulating coating based on hollow microspheres; t_room is temperature inside room; t_outdoor is outdoor temperature; α_hc is heat release coefficient of heat-insulating coating based on hollow microspheres; α_i is heat release coefficient of inner surface of enclosing structure; α_o is heat release coefficient of outer surface of enclosing structure; δ_structure is thickness of structure; λ_structure is heat conductivity coefficient of structure.;EFFECT: technical result is providing measurement of coefficient of heat conductivity in natural conditions of operation of enclosing structures of buildings and constructions.;1 cl, 3 dwg