FIELD: construction.
SUBSTANCE: determining the thermophysical characteristics of enclosing structures used in construction. A method for determining changes in vapor permeability resistance and vapor permeability factor over the thickness of an external wall enclosure based on the results of thermophysical tests in natural conditions includes measuring temperatures on the internal and external surfaces and throughout the entire thickness of the structure by placing sensors in the thickness of the enclosure and obtaining information from a DAVIS instruments Vantage Pro 2 weather station installed behind the external wall under study, which includes: indoor and outdoor temperature sensors, indoor and outdoor relative humidity sensors, atmospheric pressure sensors, precipitation sensor, anemometer, solar radiation sensor, ultraviolet radiation sensor. The incoming information is systematized in the form of graphs, which are used to construct a graph of temperature distribution across layers. Calculate the values of the maximum possible elasticity of water vapor E (Pa) based on known temperaturesτ, obtained from sensors placed in the thickness of the fence under study, and constructed graphs of temperature distribution across layers. A graph of water vapor elasticity E along the cross-section is plotted on a cross-section of the external fence under study. The values of water vapor elasticity E for each temperature along the cross section are taken from the table; each temperature value corresponds to the maximum value of water vapor elasticity E and is a tabular value; in parallel with the first section, a second section is constructed, where the same wall of the test sample is constructed on the scale of resistance to vapor permeation in the case with a multilayer study design of the outer fence, made of various materials, on the scale of reduced vapor permeability resistance. The points of the E (Pa) graph are transferred from the outer and inner surfaces from the first cut to the second cut and connected by a straight line, the remaining points of the first cut are transferred to the inclined graph in the form of a straight line on the second cut and the points are projected down onto the horizontal line, the resulting segments on the horizontal lines numerically express the values of vapor permeability resistance of fencing layers, knowing the thickness of the layer and the obtained values of vapor permeability resistance, determine the values of the vapor permeability coefficientμ. The value of the vapor permeability coefficient of each layer is determined.
EFFECT: development of a graphical method that makes it possible to provide solutions to the problem of determining changes in vapor permeability resistance (R) and vapor permeability coefficient (μ) by the thickness of the external fencing structure under study when conducting full-scale thermophysical studies.
1 cl, 8 dwg
