HEAT EXCHANGE MATHEMATICAL MODEL IN ISOLATION WARE WITH AND WITHOUT COOLING SYSTEM
Abstract
The work of rescuers in extreme microclimatic conditions is particularly difficult, it is associated with the danger of the occurrence of thermal strain of the organism, which can cause a heat stroke. Therefore, the study to determine the actual parameters of the means of individual antimicrobial protection of the workers of the operational and rescue service of civil protection of the State Service of Ukraine for Emergency Situations is relevant and important.
Describing the general methodology of research, it is necessary to analyze the most common system "the environment - protective clothing - the body of the rescuer - physical activity." Two components of the system: the environment and physical activity - are ergothermic stresses that affect the body's thermal state. The first component is characterized by parameters such as temperature, humidity and air velocity, thermal radiation, and unsuitable for breathing that are not dependent on the rescuer. The second component depends on the type and conditions of the work, that is, the speed of travel, the mass of equipment and additional load, the length of the overrun area, direction and angle of inclination. This component may be mild, moderate, heavy and very heavy.
In this paper an analytical method is developed which helps to study the processes of heat and mass transfer in the periosteum of the protective examination depending on the influence of the external environment, the thermal state of the human body for the different combination and number of layers with air layers in the cover of the costume. The dynamics of temperature in the subcutaneous space in the presence of heat carrier during the time period, as well as without its application, is analyzed. This analysis confirmed that the use of thermal insulation systems significantly reduces the temperature under the costume space of a rescuer. The developed mathematical model can be used during the design of means of individual antimicrobial protection of rescuers who perform fire and rescue, rescue and other urgent work.
