On a more precise assessment of coordinates of the seat of fire in the premises

Introduction. The problem of quick identification of fire coordinates in the premises is particularly relevant electrical activation. A number of authors focus on this problem, in particular, they analyze the method of graphic and analytic positioning (хо, уо) of the fire seat in the premises. Theoretical part. The method developed by the authors makes it possible to identify the coordinates of a fire by reading N values of temperature sensors. The method has the following features: a) it is based on the fire model obtained by R. Alpert for premises, and shows that it is necessary to take into account not just the temperature read by temperature sensors, but the value of this temperature in third power; b) it allows you to determine the coordinates of the seat of fire, not only by the increase in temperature, but also by the speed of its growth, and the result in both cases will be almost the same and independent of either the height of the premises, or time, or the form of fire. Computer experiment. To verify the obtained expression, a computer experiment was carried out using the example of a warehouse. For two A and B fire variants using R. Alpert model and the specified coordinates of the fronts, using a specially developed computer program, the dynamics of temperature increase ΔTi (t) and the rate of its change were simulated. Full-Scale experiment. The paper presents the results of a full-scale experiment in which data from 16 thermocouples showing the spread of the thermal field of fire were registered. Using this data in the computer program it was possible to set the coordinates of the fire that corresponded to the real location of the seat of fire. Conclusions. On the basis of the obtained expression it is possible to set quickly, with acceptable reliability, the coordinates of the seat of fire, which allows to forcefully activate one, two or three sprinklers that are able to fight the fire at the earliest stage with the minimum flow of fire extinguishing agent.