Determination of thermal impact formation parameters for testing fire detectors

Yaroslav Kalchenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-3482-0782

Kostiantyn Afanasenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0003-1877-1551

Diana Іstratova

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-5229-5600

DOI: https://doi.org/10.52363/2524-0226-2022-35-11

Keywords: thermoresistive sensitive element, thermal fire detector, thermal effect

Аnnotation

Experimental studies have been carried out to determine the parameters of the formation of thermal effects on the thermoresistive sensitive element of thermal fire detectors during tests using a method based on the Joule-Lenz law. According to the results of the experiment, a mathematical model of the dependence of the temperature of the thermistor on the electric current and the electric voltage applied to it during the tests. The graph of dependence of temperature of a sensitive element on these parameters is constructed. From the analysis of the graph it follows that the temperature of the sensitive element of the thermal fire detector largely depends on the electrical voltage applied to it during the tests. The time of reaching the temperature of the thermoresistive sensitive element of the temperature of operation of thermal fire detectors of class A1 has been experimentally determined. The numerical values of the parameters of the formation of thermal influence on the thermoresistive sensitive element of the thermal detector, when conducting tests based on the Joule-Lenz law, are presented in the form of tables. The recommended values of electric voltage and electric current for heating the thermoresistive sensitive element to a temperature of 54 ºС, which is the minimum operating temperature of thermal fire detectors of class A1, have been determined. Limit values of electric voltage and electric current at which the sensitive element of the detector is not heated to the minimum operating temperature are determined. It is shown that the obtained research results can form the basis for the development of new thermal fire detectors, which are tested in automatic mode and at the place of its installation. It is shown that conducting tests of thermal fire detectors by a method based on the Joule-Lenz law will reduce the time of its conduct by at least 1,83 times.

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