THERMOELECTRIC SYSTEM MODEL FOR HEAT UTILIZATION GENERATED BY ELECTRONICS

Aim. Proposed is the thermoelectric system for utilizing the heat emitted by electronic equipment, including thermal battery with consumable working substance and thermoelectric power generator. It is considered the thermal and mathematical model.Methods.The model is built by solving the problem of calculation of melting processes and solidification of the working substance in the heat accumulator, characterization of a thermoelectric generator to convert the heat from electronics into electrical energy.Results. Given are the results of numerical experiment on the developed models, presented as graphs that evaluate the duration of complete melting and solidification of the working agent depending on the power electronics, as well as the intensity of heat exchange with the environment.Conclusion. Based on the efficiency generated by the temperature difference between the junctions of the thermoelectric power generator and its efficiency

Study of the Tribological Characteristics of A Porous Iron-based Antifriction Alloy

The paper presents the results of a study of the tribological properties of an antifriction iron-based alloy with pyrite added to the charge under conditions of self-lubrication in comparison with an iron-graphite antifriction alloy

STUDY OF THE TRIBOLOGICAL CHARACTERISTICS OF A POROUS IRONBASED ANTIFRICTION ALLOY

The paper presents the results of a study of the tribological properties of an antifriction iron-based alloy with pyrite added to the charge under conditions of self-lubrication in comparison with an iron-graphite antifriction alloy

STUDY OF THE TRIBOLOGICAL CHARACTERISTICS OF A POROUS IRON-BASED ANTIFRICTION ALLOY

The paper presents the results of a study of the tribological properties of an antifriction iron-based alloy with pyrite added to the charge under conditions of self-lubrication in comparison with an iron-graphite antifriction alloy

DEVICE FOR CAUTERY OF BLEEDING USING A SALT WITH LOW CRYOHYDRATE DISSOLUTION TEMPERATURE

Objectives The aim of the study is to consider the design of a device for the cautery of bleeding by the method of local freezing of the blood flow zone performed using a salt with a low cryohydrate dissolution temperature, as well as to model heat exchange processes when using this technique.MethodA design for a device for cauterising bleeding using salts having a low dissolution temperature was developed. This ensures a high cooling intensity, shortening the time of formation of a thrombus stopping the blood flow. A model of the device was constructedaccording to the principlesgoverning the solidification of a viscous liquid and heat transfer associated with the dissolution of salts in water. The model was calculated using the finite difference method. A determination of haemostasis duration wasprovided by a numerical experiment.ResultsPlots of the temperature dependence of the salt solution in water over time are obtained, reflecting the duration of the device's output to operating mode, as well as plots of duration of a 3 mm thick formation of solid phase blood against the temperature of the solution for different values of blood flow pressure in the wound area.Conclusion On the basis of the numerical experiment, it was established that ammonium nitrate can be used as a working substance (salt) in the device. When it is dissolved in water, the minimum temperature of the solution is 256 K. The selection of the salt type and its quantity should be guided by medical norms and regulations in order to avoid the process of frostbite of the tissues adjacent to the bleeding zone. It was shown that the duration of blood solidification and the formation of a thrombus of the required thickness depend significantly on the pressure of the blood flow in the wound area, which must be taken into account when designing the device

THERMOELECTRIC SYSTEM FOR EXTRACTION OF FOREIGN OBJECTS FROM HUMAN BODY

Objectives. The purpose of the article is to examine the design of the thermoelectric system (TPP) for the extraction of foreign objects from the human body by the method of freezing, as well as the simulation of heat transfer processes in it.Method. A design and a physical model of the system for the extraction of foreign objects from the human body are proposed, in which the source of cold is a thermoelectric module (TEM) placed on a special mechanical device made in the form of a probe, which also provides removal of heat from the hot junctions of the module. A mathematical model of thermal power plants was developed, implemented on the basis of solving the problem of ice layer growth using the method of solving the non-stationary Fourier differential equation, presented in partial derivatives by reducing it to an equation with full derivatives based on the use of an extended version of the Lame-Clapeyron substitution, and power series, which describes the temperature distribution in the frozen ice layer and satisfies the boundary conditions of the problem.Result. Data were obtained on the change in temperature of the extracted object and the thickness of the ice layer over time at various values of the cooling capacity of TEM. It is established that the duration of the formation of an ice layer between the object to be extracted and the cold surface of the TEM, which is the executive element of the system, is within narrow limits that meet medical standards, while the speed of the ice growth process depends on its thickness (increasing the cooling capacity of the TEM from 1000 to 3000 W / m2 reduces the duration of the formation of an ice layer, 2 mm thick, by almost 40 s, while the temperature of the extracted object decreases from 269 K to 252 K). It is indicated that the selection of geometric parameters of TEM and its power supply should focus on the limitations on the operation of the device, as well as medical norms and standards in order to avoid the process of frostbite of the adjacent tissues.Conclusion. A method is proposed for increasing the efficiency of the system, according to which the preliminary cooling of the TPP by an external source of cold is used, as well as the use of forced TEM operation modes

A Combined Method of Increase of Fluidity of High-viscous Local Oil

In this research work results of influence of electromagnet square to reologic peculiarity of petroleum are given. Decreasing more than 20 gradusselcium of energy of active of petroleum influence on electromagnet square was observed

Educational And Developing Tasks Of Labor Education

Comprehensive upbringing of the person is the right way to grow as a human resource for the society. It is a commitment to love and devotion to the country, and to work hard for the good of the people. It is based on the acquisition of scientific knowledge and the discovery of mental development. It is aimed at improving the skills and abilities of students, and on high spirituality