Objective. The aim of the study is to study the methods of temperature control using the Peltier element in a given temperature range.Method. A heating method is applied using a Peltier element in a temperature control device of a small plate by regulating the current and using a cooling fan to reduce inertia.Result. A technique for controlling the Peltier element to maintain the required temperature is obtained, which is carried out using the PWM method generated by the ATmega2560 processor. The H-bridge on the L6203 integrated circuit switches the current direction and can control the current up to 5A on the Peltier element using a PWM signal.Conclusion. The resulting control algorithm provides an increase in the heating current on the Peltier until the temperature rises to a predetermined high temperature value, and then by changing the direction of the current, a cooling current is created on the Peltier element until the temperature of the copper plate drops to a predetermined low temperature. With repeated repetition of this sequence, the regularity of temperature changes is monitored to study the process of heating and cooling the plate using the Peltier element.
Objective. The purpose of the article is an experimental study of a thermoelectric system (TES) for the treatment of periodontal diseases by the method of local hypothermia.Method. An experimental stand and a technique for measuring prototypes of TEC for the treatment of periodontal diseases by the method of local hypothermia are described. The experimental stand is made on the basis of the measuring equipment of the laboratory of semiconductor thermoelectric devices and devices of the FSBEI HE "Dagestan State Technical University". In the first version of the TES, two thermoelectric modules (TEMs) are directly mated with the simulator of the periodontal area through a silicone layer, and in the second, thermal contact between the thermomodule and it is made through a special highly thermally conductive nozzle.Result. Graphs of the time dependence of the temperature change of the control points of the experimental samples of thermal power plants for the treatment of periodontal diseases by the method of local hypothermia at various TEM supply currents were obtained. The control points were the cold and hot junctions of the TEM, periodontal simulator, heat sinks from the hot junctions of thermal modules.Conclusion. As a result of the measurements, it was found that it is possible to achieve the required level of decrease in the temperature of the periodontal area using standard TEMs of the Kryotherm LLC (St. Petersburg) type TV-17-1.4-1.15 and DRIFT-1.2. In this case, the duration of the output of the samples to the regime in the first case is 230 s, and in the second - 320 s. The deterioration of the dynamic characteristics of the second version of the device is associated with the presence of a highly thermally conductive nozzle. As a result of full-scale tests, it was shown that the use of forced air and liquid cooling to remove heat from TEM hot junctions is sufficient to comply with the required temperature regimes of hypothermia.
Objective. The aim of the study is to develop a mathematical model for determining the temperature field of a human eyeball under thermal influence on its anterior segment.Method. A mathematical model has been developed to determine the temperature field of a human eyeball when exposed to its anterior segment.Result. The temperature dependences of characteristic points inside the eyeball on time during cyclic exposure to heat flow on the anterior segment are obtained, as well as graphs of temperature distribution along the optical axis of the eyeball when applying heat flow.Conclusion. The developed mathematical model allows us to take into account the thermophysical characteristics of all the main structures of the human eye, and also shows the effectiveness of temperature massage of the ciliary body and lens.
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