METHOD OF DETERMINING CHANGE IN THERMAL RESISTANCE AND COEFFICIENT OF HEAT CONDUCTIVITY WHEN EXTERNAL EFFECT OF COUNTER HEAT FLUX ORIGINATES IN EXTERNAL WALL BASED ON RESULTS OF THERMOPHYSICAL TESTS IN NATURAL CONDITIONS

摘要

FIELD: physics.;SUBSTANCE: invention relates to the field of determining the thermophysical characteristics of enclosing structures and can be used in construction to evaluate heat-shielding properties based on test results in full-scale conditions. Disclosed is method of determining change in thermal resistance (R) and coefficient of heat conductivity (λ) when external effect of counter heat flows originates in external wall based on results of thermophysical tests in natural conditions. Disclosed is a method of determining changes in thermal resistance (R) and coefficient of heat conductivity (λ) by plotting imaginary points on the temperature distribution graph across the thickness of the wall based on test results in natural conditions, involving measurement of temperature on the inner and outer surfaces, as well as along entire thickness of structure by arrangement of sensors in thickness of enclosure, incoming information from which is sent to data bank (DB) of computer (PC), where processing and systematization in the form of graphs is performed, using which a graph of temperature distribution over layers is plotted on the cross-section of the analysed external enclosure, which is built in the selected scale and pre-broken into layers in places of sensors location. Graphically derived values of thermal resistances of barrier layers are used to calculate the coefficient of thermal conductivity taking into account the thickness of the layer.;EFFECT: high information value of determining changes in thermal resistance (R) and coefficient of heat conductivity (λ) over the thickness of the wall enclosure based on results of thermophysical tests in natural conditions, including cases of occurrence in the thickness of the wall of the physical effect of opposite heat flows.;1 cl, 8 dwg