A. A. Shul’zhenko

Calculation of the thermal field of woven heating elements

To describe the thermal field at the surface of a woven electric heater with a characteristic matrix structure, a problem has been posed and corresponding equations have been derived. Solving this problem allows one to form a structure of a heater that provides the required level and necessary configuration of temperatures at its surface.

Method of designing heating units on the basis of carbon (graphite) threads

Existing methods of calculating thermal characteristics of heating units based on carbon threads with graphite structure are based on calculation methods applied to metal wire heating units with a very different structure from carbon threads. This approach results in serious imperfections in the representation of the real thermal fields formed by carbon threads. To eliminate this drawback, a method is suggested with separate consideration of the ongoing physical processes in a carbon thread affected by an external electric field.

Calculations for a woven electrical heater with a uniform temperature distribution on its surface

There exists a problem of local overheating when heating the flat surfaces of objects with woven electrical heaters with a nonuniform thermal field. A method for determining the location of high-resistance filaments in the heater, which provides more uniform distribution of thermal field, was proposed for the purpose of obtaining a more uniform temperature field. Results can be used by professionals involved in the creation and operation of woven heaters, water capillary heaters, and various kinds of filament heaters.

Computation of the thermal field of a woven heater with a compact arrangement of high-resistance filaments

The main purpose of the present study is to obtain working mathematical relationships that allow for the carrying out of practical thermal computations for woven heating elements consisting of a warp and weft of only high-resistance filaments without any gaps between them. Until the present time, a description of the thermal fields at the surface of such heating elements has not been made. The results of the study can be used in computations for woven heating elements and in computations for heating elements of a similar structure made by other technologies and other materials.

Some features of thermal interaction of heaters and humans on contact heating

Processes in the human-woven heater-thermally insulating layers of a belt with electric heating-environment system are considered. The temperature distribution in the system with contact heating for switched-off and switched-on heaters is described. The reaction of the system on switching on the heater that was obtained experimentally using woven heaters is shown. The results of the study can be used in the development of a wide range of products providing contact heating of biological objects.

Modeling of thermal processes in the tea withering chamber

An analysis of the temperature distribution in the tea-withering chamber has been carried out based on mathematical modeling. The revealed non-uniformity of the temperature distribution was adjusted due to the use of additional heat sources. The novelty of the work consists of applying additional heat sources in the areas where the conveyor belt that represents the modern energy-efficient elastic electric heaters are located.

Features of operation of heating elements based on carbon fibers

Various mathematical models of carbon fibers are analyzed. Models are proposed, which make it possible to numerically model more exactly the structure of carbon fibers and the degree of influence of production processes on their thermal characteristics.

Details of transporting and packaging semiliquid products

Details of the pipeline transporting and packaging of semiliquid products whose viscosity depends largely on temperature are considered. The type of liquid product used in our investigation is honey, pumped along the product pipeline of an ALB165 automated prepackaging and packaging line. The physical characteristics of honey are analyzed with allowance for temperature, and the effect of the product’s viscosity on the energy characteristics of the pump installed in the product pipeline is assessed. Our work is of value to specialists in the pipeline transporting and automated processing of semiliquid products.

Calculation of thermal field of woven electrical heater located in a heat-insulating layers of clothes

Calculation features of a thermal field of a woven heater located in layers of clothing are considered. The urgency of this work is determined by the expansion of the creation of winter clothing, special-purpose clothing and medical production with electrical heating. Mathematical relations for calculating the effect of a woven electrical heater located in heat-insulated clothes provided in the form of a cylindrical model are received. The work is of interest to a wide variety of professionals involved in the development of winter clothes and other products with electrical heating.

Woven heaters and their contacts

Recently, elastic heaters have become more widespread, including woven ones that provide heat formed by them and spread in the thermal field. The fact that they are elements of energy saving technologies contributes to their widespread occurrence. The main aim of this paper is to find ways to increase the efficiency and safety of the operation of woven heaters. The results of studying the behavior of the electric parameters in distributed matrix structures allows for a solution to these problems not only in regards to woven heaters, but also heaters with a similar structure, for example, knitted, film, some filament heaters, etc.