METHOD OF DETERMINING THE TIME INTERVAL WHEN CARRYING OUT FIELD THERMOPHYSICAL RESEARCHES OF EXTERNAL WALLS OF BRICK BUILDINGS, IN WHICH IN THE WALL FENCING, OCCUR CONDITIONS OF THE QUASI-STATIONARY HEAT TRANSFER REGIME Russian patent published in 2018 - IPC G01N25/18 

FIELD: construction.

SUBSTANCE: essence of the method of determining the time interval when carrying out field thermophysical researches of external walls of brick buildings, in which in the wall fencing, occur conditions of the quasi-stationary heat transfer regime includes measurement if external and internal air temperature inside and outside wall, surface temperature in 5 points by placing sensors at equal distances in the wall thickness. Based on the measurement results, a graph is constructed, on which time intervals t_stat are allocated, in the period of which the fluctuations amplitude in the outside air temperature is not more than 2°C, and duration of which is not less than the time of thermal inertia of the wall. The time t_ν passes the nearest local temperature extremum from the outer to the inner wall surface. From the beginning of the allocated interval t_stat, a period of time is excluded equal to tν_. Further operations are performed with the remaining interval t_{stat 1}. In case when t_ν>t_stat, this interval is excluded from consideration. The permissible error Δt_req.is set. The condition Δt≤Δt_req. for each measurement result is checked. If the condition is not met, this result is excluded from the time interval t_{stat 1}. If the percentage of excluded results exceeds the value Δt_req., the given interval t_{stat 1} is not suitable for determining the resistance to heat transfer, the next interval is considered.

EFFECT: expansion of the range of determination of thermal properties of enclosing structures.

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