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 λhc is heat conductivity coefficient of heat-insulating coating based on hollow microspheres; δhc is thickness of heat-insulating coating based on hollow microspheres; troom is temperature inside room; toutdoor is outdoor temperature; αhc is heat release coefficient of heat-insulating coating based on hollow microspheres; αi is heat release coefficient of inner surface of enclosing structure; αo is heat release coefficient of outer surface of enclosing structure; δstructure is thickness of structure; λstructure 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
