Vortex heat generators are installations that allow you to receive thermal energy in special devices by converting electrical energy.

The history of the creation of the first vortex heat generators dates back to the first third of the twentieth century, when the French engineer Joseph Rank encountered an unexpected effect, exploring the properties of an artificially created vortex in the device he developed - a vortex tube. The essence of the observed effect was that at the exit of the vortex tube a separation of the compressed air flow into a warm and cold stream was observed.

Research in this area was continued by the German inventor Robert Hillsch, who in the forties of the last century improved the design of the Rank vortex tube, achieving an increase in the temperature difference of the two air flows at the outlet of the pipe. However, both Rank and Hilsch failed to theoretically substantiate the observed effect ...

In every modern house - apartment, of course, there is an extensive electric network. Each room has one or two outlets. But, as on purpose, they are usually located in the wrong place. Or the number of electrical appliances that must be turned on exceeds the number of outlets. Or you must turn on a portable appliance, such as an electric heater.

These electrical appliances sometimes consume significant electrical power. Then portable extension sockets come to our aid. The cable for such a portable outlet is necessarily selected in double rubber insulation (the wires themselves are insulated and additionally placed in an external insulating sheath). Best when the wires in the cable are stranded, flexible. The diameter or cross-section of the wires must correspond to the permissible electrical load. What should be the cross-section of the cable wires? ...

Everyone, at least a little connected with electrical engineering (and this is a household, garage, car) has to deal with electrical wiring, a variety of cables and wires. We often use all kinds of extension cords, portable sockets.

How to determine whether we use cable or wire cross-sections? "Old electricians" determine the cross-section of the wire "by eye". And we will try to calculate its cross-sectional area more precisely.

Usually the wire has a circular cross-sectional shape. However, the permissible current in the wire is calculated based on the cross-sectional area of ​​the wire. Determine the cross-sectional area of ​​single-core and stranded wire. Open the wire sheath. If the wire is single-core, measure its diameter. According to the "old, school" formula of the area of ​​a circle, we determine the cross-sectional area of ​​the wire ...

I must say right away that I am not professionally engaged in lighting design and I am not a specialist in this field. I have always been more interested in technical issues in indoor lighting (lighting engineering, various light sources, automation and lighting control). Although I really like beautiful interiors and can spend hours watching thick glossy magazines on room design, construction and repair with bright color pictures. I especially like magazines with photo examples of real projects. My favorite magazines of this type are Major House and Beautiful Apartments.

Flipping through this type of magazine, first of all, I pay attention to how the lighting is organized in a particular case.At the same time, somehow imperceptibly for yourself, you begin to notice and clearly realize the general trends in the development of home lighting: what lamps and fixtures are used, how they are placed, how the illuminated interior looks from different angles, and much more ...

Many people at the word "cottage" imagine 4 acres and a small house hammered together from the boards, where all the electrics in the country are a lonely light bulb. However, if you look at the dictionary, it turns out that the cottage is a country house for an urban family, as a rule, not used by its owners for permanent residence.

Today, almost everyone has the opportunity not to limit themselves to any framework and to embody any fantasies in their country house. Life in the country is also comfort, calm atmosphere, clean air and beautiful nature. This often raises one main question. Build everything yourself or buy a cottage?

For the construction of the cottage it is advisable to hire professionals. But then, how to independently competently operate and maintain an electrician and other engineering systems in the country, or maybe make it more comfortable? ...

This collection contains the best articles on bgv.electricianexp.com on electrical and fire safety in the operation of electrical appliances and electrical wiring in everyday life.

Electric current is life threatening! Moreover, his main danger is that he does not see and do not hear. The degree of its influence depends on many factors: on the type and magnitude of the voltage and current, the frequency of the electric current, the path of the current through the human body, the duration of the electric current on the human body, environmental conditions. It must be remembered that the human body is not affected by stress, but by the magnitude of the current. Under adverse conditions, even low voltages (30 - 40 V) can be life threatening!

In order to minimize the possibility of electric shock at home, it is necessary to make the rules of electrical safety known and understandable to everyone and everyone ...

One of the simplest, but at the same time brilliant inventions of mankind is a corrugated pipe (corrugated pipe). Why is she so wonderful?

Corrugated pipe - this pipe with a variable cross-section. Short sections with thin walls and a small diameter are interspersed in it by sections with thicker walls and a large diameter. In this case, thick-walled sections give the pipe rigidity in the transverse direction and the ability to withstand impacts and loads, and thin-walled sections allow the pipe to bend at almost any angle and even stretch within limits depending on the type and total length of the pipe.

The corrugated pipe can be metal, but most often it is made of plastic. Flexibility and durability of a corrugated pipe predetermined its wide distribution. For the installation of cable lines for electrical wiring and various other networks, a special electrotechnical corrugated pipe is used ...

Soldering iron is the main tool for soldering. The convenience with which you solve the tasks depends on its correct choice. Soldering irons vary in design and power. Rod sleeves are available with ceramic and spiral heaters. Soldering irons with spiral heaters are practical and durable, but they warm up for a relatively long time. Ceramic soldering irons heat up much faster, but at the same time require careful use and a very careful attitude, since any blow can damage such a soldering iron.

According to their power, soldering irons can be different.Traditional soldering irons have the following capacities: 3 - 10 W soldering irons are designed for desoldering very small microcircuits, 20 - 40 W soldering irons are considered household and amateur radio, 60 - 100 W soldering irons are used, for example, car service employees use for soldering thick wires, 100 - 250 W soldering irons use for sealing ...