FEATURES OF THE COEFFICIENT OF VARIATION OF PARAMETERS OF THE GAS ENVIRONMENT IN FIRE IN THE PREMISES

Abstract

The object of the study is the selec-tive coefficient of variation of danger-ous parameters of the gas environ-ment during the ignition of materials. The measure of the sample coefficient of variation of an arbitrary hazard-ous parameter of the gas environment observed at an arbitrary time interval is substantiated. The representativeness error of the measure of the sampling coefficient of variation, which depends on the value of the measure and the sam-ple size, was determined. The measure allows you to numerically determine its value for an arbitrary observation inter-val. The difference in the measure at the intervals corresponding to the reli-able absence and occurrence of ignition allows to detect the occurrence of igni-tion of the material. According to the results of laboratory studies, the mea-sures of the sample coefficient of varia-tion for carbon monoxide concentration, smoke density, and temperature of the gas medium in the laboratory chamber at intervals of absence and appearance of ignition of alcohol, paper, wood, and textiles were determined. It was estab-lished that the dangerous parameters of the gas environment at the intervals of absence and presence of ignition are characterized by different values of the increase in the measure of the sample coefficient of variation. For example, it is determined that the ignition of alco-hol causes the maximum increase in the measure for carbon monoxide concen-tration from 0.135 to 0.441, for smoke density from 0.629 to 0.805, and for temperature from 0.001 to 0.115. When paper catches fire, the measure for car-bon monoxide concentration and tem-perature increases from 0.0026 to 0.140 and from 0.0019 to 0.05, respective-ly. When burning wood, the measure for carbon monoxide concentration and temperature increases from 0.0072 to 0.177 and from 0.0067 to 0.016, respec-tively. The obtained results, provided that the hazardous parameters of the gas environment in the premises are measured and the sample coefficient of variation is calculated in practice, make it possible to use them in the creation of early fire detection systemsKeywords: ignition of material, gas environment, dangerous parameters, measure of sample coefficient of vari-ation