Functions - As a spiral tube, with a tank, as a tube plate

The stove is considered a traditional construction for heating buildings. But if it is installed in a large house with several floors, then its capacity may not be enough for even heating of all rooms. The outlet here can be a coil for the furnace, which is also called a heat exchanger.

It is connected to a heating device, then it is carried out in each room and thus provides ideal and uniform heating of the entire structure.

General information

Principle of operation

The coil is considered a device for indirect heating of water.

Its job is to circulate the fluid in a closed loop system through natural convention. In the process of exposure to heat, water is heated. In this case, the hot layer rises to the top, and the cold one takes its place. The process of mixing water by heat is called circulation. The heated coolant transfers its heat to the water as it rises.

Moreover, the stove here does not serve as a heat exchanger, i.e. because it creates warmth.

Functions of the coil

A coil or heat exchanger is often used to create another heating circuit, without which the combustible fuel begins to heat the walls of the furnace, which, in turn, when interacting with air, they begin to give off their heat, but it will simply fly away through the gas outlet pipe.

By means of a coil, excess heat is removed from the air to the circulating water, which increases efficiency due to obtaining a double coefficient per 1 unit.

fuel. The heat exchanger is used in sauna stoves, houses, garages. And everywhere the function performed will be different - heating the water in the shower, heating the premises, etc.

Varieties

Coils differ in design, in material of manufacture, as well as in place location in the system.

There are the following types:

• Coil in the form of a spiral pipes.

  This type is built directly into the tank, which contains the heat transfer fluid. The ends of this pipe are expanded into the walls, due to which the coolant circulates inside and heats the water in the tank. If you correctly calculate the length of the coil, select the material from which it will be made, the number of its rings, it is quite possible to speed up the process of heating the water. By leaving part of the coil open, you can increase the heating of the room.

• Coil with a tank.

  The container with the coil pipe is carried out as close as possible to the firebox. Here, it is important to strictly observe the slope of the pipe being carried out in order for natural circulation to take place. Sometimes an electric pump is installed for this. As a rule, this type is used when creating a heating circuit. Due to the fact that the water is heated when passing through the pipe around the firebox, the heating rate increases.

• Tubesheet with 2 sealed tanks and many small pipes.The tanks are located on opposite sides of the firebox and are connected by pipes. Heat transfer takes place at the connection points. Such structures are used for heating large premises, including multi-storey buildings.

Important : When operating this type of heat exchanger, it is necessary to take into account the chemical composition of the water, since when a large amount of scale forms, the walls can break through .

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• In the form of a water jacket. The design is represented by two sealed tanks located one in the other. This look is effective and easy to use.

  Due to the fact that the heat exchange is faster.

Materials

The coil can be made from the following materials:

• copper. It is the most optimal material for a heat exchanger. Since copper is very ductile, the tube can bend and take any shape. It also has a high coefficient of thermal conductivity exceeding 380.

  However, copper is not very resistant to heat and is rather expensive;

• stainless steel. This material also has sufficient ductility, resistant to temperature fluctuations, but its thermal conductivity is lower;

Note: Galvanized steel cannot be used when heated, t. because when heated, it begins to release toxic compounds.

• Metal-plastic. It is considered an easily accessible and practical material, but does not have a high thermal conductivity, which is half that of copper.

  However, metal-plastic has durability and resistance to temperature fluctuations.

Copper pipes are used most often to make a coil. A variety of fittings can be easily attached to such pipes.

As mentioned earlier, the heat exchanger is mounted in the firebox, from which pipes go along which water moves. When installing an oven for heating and cooking, it is suitable to use a coil in a metal tank made of pipes.

Thanks to the winding surface, rapid heating is ensured, however, specialist assistance is required to make them and clean them from combustion products.

A 50 mm U-shaped pipe is used for the construction. If a cooking place is not provided in the oven, then additional small tubes are welded on the top of the coil.

Coil made of steel sheets is mainly used in stoves only for heating the building. They are made of 0.

5 cm of metal sheet, pieces of rectangular pipes 40 * 60 mm and round pipes of the same size for supplying water.

By installing a water circuit in the stove heating, an increase in fuel efficiency can be achieved When the coolant burns out, its energy goes to heating the body, smoke channel and walls, and at the same time, a high temperature of the circulating water in the pipes is ensured.

The following advantages can be highlighted:

• It is easy to make a homemade coil for a brick oven;
• the possibility of combined heating using warm air vapor from the stove and hot water in the batteries;
• greater choice of fuel.

What to focus on when choosing

Of course, the main role is always given to the price of the product. The choice of material greatly influences the design of the system.

Next is the question of the possibility of manufacturing.

The final step will be the location of the oven. And here it is important to take into account the ultimate goal - whether you need a heating and cooking stove or heating for the house, a stove for a bath or heating a garage. Either option needs its own approach.

Note: It is necessary to specifically define such nuances as: what area needs to be heated, whether there will be parallel hot water supply, how much fuel can be consumed, etc.

Therefore, choosing the appropriate design option, you focus on the financial situation, material availability, and need.

So, for example, a bath will require a complex version. Here, the main task is to warm up 2 rooms and heat the water (steam room, dressing room and shower). So, the most suitable for this would be a coil for the oven and heating water.

In wooden houses, as a rule, a universal design of a heating and cooking stove is used.

The most common type is considered to be a coil with a tank. It is easy to use and can handle many tasks such as heating, hot water and cooking.

A homemade horizontal heat exchanger from available tools is perfect for heating a garage. A car radiator, an old cast iron battery, etc. can be used here.

Structural elements

In order to create a complete heating of the building, it is necessary to use a holistic system. Which includes a metal container and nozzles connected to it, not in direct contact with an open flame. Furnace equipment heats water, which travels along a coil throughout the house, heating it.

The quality and correct connection of the device to the oven is extremely important.

There are several types of coil connection:

• Outside.

  Here the coil is represented by a separate container that contains water. A part of the exhaust pipe for combustion products is located in the tank. The installation of this device is difficult and it is better to seek professional help. But it is quite easy to operate. If plaque forms on the walls or in the event of a leak, it can be easily dismantled.

• Inside. For this option, special equipment will be needed, which is installed directly inside the furnace and is connected to a coil laid along the entire perimeter of the house. It is better to do this even at the stage of construction of the stove, since after the construction is completed it will not be easy to get it.

The main nuances of creating a coil with your own hands

There are some rules that should be taken into account when creating a coil yourself:

• Voids can form in the heat exchanger, which should not be more than five millimeters. Otherwise, by exposure to hot gas vapors from the furnace, water in the device may boil;
• For the coil, pipes more than three millimeters thick are taken, otherwise, with a smaller pipe wall size, elements may burn out;
• When the internal arrangement of the device between the furnace compartment and the heat exchanger device must be left with a gap of twelve millimeters to compensate for the possible expansion of metal parts during the heating of water.

Features of use

Most often, the stove in the house serves only for heating the premises. Many also use it to provide hot water. And here the heat exchanger should receive up to ten percent of all heat generated by furnace heating.

For the manufacture of a coil, you need to use only high-quality pipes of a suitable diameter, only then will optimal heating of all rooms in the house be ensured. This question is very important.

As well as the choice of material, which must necessarily be resistant to high temperatures.

The use of a coil is the most expedient and optimal solution for heating a large house with stove heating.

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