RESEARCH OF PROCESSES OF HEAT TRANSFER IN THE COOLING SYSTEM ELEMENTS REA, MADE ON THE BASIS OF MELTING HEAT ACCUMULATORS WITH ADDITIONAL LIQUID HEAT SINK

The paper considers the system of cooling elements REA with intermittent by heat, made on the basis of melting heat accumulators with additional liquid heat sink. The basic computational relations for theoretical studies. Presents the dependence of the length of stable work of the REA element in ensuring its temperature conditions of the investigated system

SYSTEM EXHAUST HEAT FROM ELEMENTS OF CEA ON THE BASIS OF PRAVASIS THERMAL BATTERIES

Considered design systems exhaust heat from the elements REA mode intermittent heat. Describes their applications and advantages over existing analogs of being more reliable performance and lower limits on the pause in the work of the electronic device

CONVERTER SOLAR RADIATION INTO ELECTRICITY TO SUPPLY THE AUTOMOTIVE SEMICONDUCTOR THERMOELECTRIC AIR CONDITIONING

The article considers the possibility to increase the efficiency of converters of solar radiation into electricity by combining constructive photoelectric effect, See-beck thermoeffect and semiconductor solar cells, which will create integrated device to provide power semiconductor thermoelectric automobile air conditioner

MATHEMATICAL MODEL OF THE RECTIFIER OF THE ALTERNATING VOLTAGE EXECUTED ON THE BASIS OF THE THERMOELECTRIC TRANSFORMER OF ENERGY

In this paper the mathematical model of the rectifier AC voltage, built on the basis of thermoelectric energy converter. The model is divided into three main parts, including the calculation of inflow and outflow of heat to the junctions of the thermoelectric structure and calculation characteristics directly thermoelectric converter. Obtained plots, reflecting the basic properties of the thermoelectric rectifier AC voltage

DEVICES FOR COOLING ELECTRONIC CIRCUIT BOARDS

In the work described structural variants of devices for cooling electronic circuit boards, made on the basis of thermoelectric batteries and consumable working substances, implementing uneven process of removing heat from heat-generating components. A comparison of temperature fields of electronic circuit simulator with his uniform and non-uniform cooling

A PROTOTYPE DEVICE FOR PRODUCING FRESH WATER FROM ATMOSPHERIC AIR

Objectives.The aim of the article is to develop the design and carry out the physical and mathematical modelling of a device for producing fresh water from atmospheric air in coastal areas, as well as under the conditions of sea transport.A Method for constructing the device for producing fresh water from atmospheric air is developed on the basis of a physical and mathematical model. Fresh water is obtained by condensation on a cold surface, which dew point is created using the natural cold of seawater with the application of the energy of moving waves for its circulation. The heating of the surface air layer adjacent to the cold surface by solar concentrators intensifies the process of the moisture condensation.Results. Data is obtained on the quantity (mass) of fresh water produced per unit of condensation surface area (1 m2 ) for 1 hour depending on the temperature difference between the condensation surface and seawater. The influence of the characteristics of solar concentrator and liquid heat remover with seawater on the device parameters is studied.Conclusion. It is established that the amount of the fresh water obtained from atmospheric air strongly depends on the temperature difference between the condensation surface and seawater. Thus, according to calculations, with an increase of the latter by 45 K, the mass of fresh water obtained from a condensation surface of 1 m2 in 1 hour approximately doubles to 5.8 kg

MODEL OF THERMOELECTRIC DEVICE FOR HEAT IMPACT ON FEET

Objectives. The aim of the study is to simulate the thermophysical processes occurring during thermal treatment procedures applied to the human foot using a technical apparatus in which a thermoelectric battery (TEB) acts as a source of heat and cold.Methods. A physical model of thermal impact on the human foot is developed by means of a device whose actuating element consists of a thermoelectric battery. Different procedural versions, varying by the zone of thermal influence as well as by the presence and absence of granulates, are considered. For the most general case, a mathematical model is constructed, based on a numerical solution of the nonstationary heat conduction problem of a layered system. As a numerical method for solving a system of differential equations, the Galerkin method, characterised by high accuracy and efficiency, is used.Results. The graphs of the temperature variation dependency on the “device-foot” system thickness for various heat flow values are obtained, as well as the temperature changes of system individual parts over time and the temperature distribution along the thickness of the foot for various values of the summand determining the looseness of its contact with the granulate.Conclusion. The developed model of a thermoelectric device for thermal action on the foot area allows a comprehensive study of the heat exchange processes during physiotherapeutic procedures to be be carried out, a thermoelectric battery with the required characteristics to be selected as well as the modes of device's operation to be determined. It is established that the duration of the steady-state output of all points of the “device-biological object” system determines the acceptable inertial properties of the device. When a granulate is used during the procedures, it is necessary to take into account the power losses when selecting the thermoelectric battery power modes