Bimetal radiators are one of the most popular heating options for any room. Their main difference from analogs is high heat conductivity, durability and reliability. This was achieved by a combination of two metals - steel for the inner shell and aluminum for the exterior. These materials are not chosen by chance: steel is very resistant to high temperatures and corrosive environments, and aluminum quickly heats up and gives off heat. As a result, quality radiators with good technical characteristics, pleasant appearance and affordable price are obtained.
Most often there are bimetallic sectional radiators, consisting of several identical sections, located vertically. Each section consists of an aluminum casing with a steel pipe inside, into which the coolant enters. In addition, at the top and bottom all sections are joined in one construction by horizontal steel pipes.
There are also monolithic bimetallic radiators that do not have connecting elements (nipples). They are a single steel collector, placed in an aluminum casing. This design ensures the stability of the pipes to high pressure and hydraulic shock, eliminates the possibility of leakage, has a long service life. However, the weight of monolithic radiators is higher, the price is also higher than for sectional radiators, and in case of breakdown it will be necessary to completely change the battery (while for sectional analogs it is sufficient to replace the damaged section or connecting element only).
Calculation of the number of radiator sections
Bimetal radiators are suitable for both residential and non-residential premises, they can be connected to a central and autonomous heating system. To create a comfortable room temperature, it is important to choose the right number of sections and know how to calculate them. Calculation of bimetallic radiators is based on the parameters of the area of the room and the capacity of one section (it is indicated in the accompanying documentation). For calculation, the following formula is used: A = B * 100 / C, where A is the number of sections, B is the area of the room, C is the power of one section of the radiator.
However, in addition to the calculation of the area you need to take into account the features of the room, namely: the number and size of windows, a balcony (glazed or not glazed), the presence of external walls, the number of storeys of the house, etc. Taking these factors into account, you must use incremental coefficients and multiply the result by 1 , 1, 1,2, 1,3, and so on. The numbers are rounded up.
Advantages and disadvantages of radiators made of bimetal
Like all types of collectors, bimetal instruments have both pluses and minuses. Their advantages include:
- Versatile, thanks to which you can mount bi-metal batteries in any house or room and connect to any heat carrier.
- The service life of the sectional models is at least 20 years, and monolithic constructions last up to 50 years.
- High heat dissipation guarantees quick warming up of the room and maintaining a comfortable temperature.
- The use of steel tubular batteries guarantees resistance to high pressure and temperature.
- The weight of the radiator allows you to mount one person.
Also it is necessary to take into account the fact that bimetallic models have a neat shape with rounded edges. This reduces the risk of injury when it strikes against the battery and adds aesthetics to the appearance of the design.
If we talk about the disadvantages of bimetallic radiators, we should note the following points:
- Using a poor quality coolant reduces the life of the radiator. In addition, this causes clogging of the tubular elements and the appearance of corrosion.
- In sectional models leakage is possible because of poor-quality connecting elements (nipples and gaskets).
- The cost of bimetallic models is higher than cast iron, steel and aluminum.
Given the shortcomings of its products, manufacturers are working to improve its quality and are trying to eliminate or minimize the problems arising in the operation.
The most famous and popular are Italian, German, Russian and Chinese companies, it is difficult to choose among them. The rating of bimetallic radiators is unanimously headed by the Italian companies GLOBAL Radiatori, ROYAL Thermo, SIRA Industrie and GRANDINI. The second place is taken by the German company TENRAD, the third - the domestic producer of RIFAR. The Chinese brand GORDI closes the rating of bimetallic heating radiators.
In addition to these, there are other manufacturers on the market, but these brands are the best quality and durability indicators.
Which bimetal radiators to choose: tips
Before buying, you should carefully study the model you liked: make a visual inspection, try the metal for bends and strength, study the technical characteristics displayed in the accompanying documentation.
At visual inspection it is necessary to pay attention to the sizes of sections of a bimetallic radiator. The optimal width and depth of the sections is 80 mm, but depending on the size and type of room in which the radiator will be installed, you can choose bimetal radiators with smaller parameters. The main thing is to correctly calculate the number of sections. It is more critical to approach the thickness of the section. In quality models, it is at least 1 mm
. There are models with a thickness of 0.8 mm or less - this figure is allowed for production, but due to it the strength of the shell and heat transfer decreases. In general, the smaller radiators for an apartment, the slower and weaker they heat the air, so a powerful collector must have either impressive dimensions, or a sufficient number of sections.
When choosing a radiator, you need to conduct small mechanical tests: try bending the section, check the nipple for softness, evaluate the elasticity of the gasket. If even small chips are visible on the collector, this indicates a low quality of aluminum and it is better not to buy such radiators.
Of the technical characteristics displayed in the product passport, it is important to pay attention to the test pressure test pressure - it is responsible for the battery's resistance to high pressure and water hammers. You also need to look at the warranty period - if it is 1-2 years, this is an occasion to think about the quality of the device.
Installation of bimetallic radiators
As already mentioned above, the installation of bimetallic radiators can be made to premises of any purpose with connection to any heating system. The process of installation in both the private house, and in the apartment, and in the non-residential premises is the same.
At the first stage, the old batteries are removed, and a new place is being prepared. Marking for brackets is made, the position of the collector is calculated and the piping is tried. The recommended distance from the floor to the radiator is from 6 to 12 cm, from the radiator to the sill - at least 5 cm, from the rear of the collector to the wall - at least 2 cm.
At the second stage, a direct installation is carried out: first, brackets are installed in the wall, then the collector is attached to them. The installation is completed by connecting the radiator pipes to the pipes.
There are several schemes how to connect a bimetallic radiator to the pipes. The most common option, which is recommended to choose for an apartment, is a one-way (or side) connection scheme. In this case, the supply pipe is connected to the upper branch pipe, and the discharge pipe to the lower one, all on one side of the battery. With this scheme, heat losses are minimal (up to 2%).
The lower connection scheme is different in that both pipes are located at the bottom. This option is justified for certain features of the room, but the heat loss thus reaches 12%.
Another scheme, diagonal, is suitable mainly for multi-sectional collectors. It provides for the connection of the supply pipe at the top of the radiator on one side, and the connection of the outlet pipe is at the bottom of the radiator on the other side.
After all the installation stages, a tap for the coolant supply opens on the radiator. As a rule, installation is performed by experienced specialists who have the necessary equipment. However, if you have the equipment, experience and knowledge, you can install the radiator yourself.
Use in the interior
The choice of bimetal radiators is largely due to the fact that the size and number of sections can be varied in any way, choosing the best option for a particular room. For example, for a country house with tall windows, short models with a height of 40 cm are suitable: thanks to their compact dimensions, they easily fit into a limited space.
If you select a model for a spacious living room of an ordinary apartment building, it is better to choose a collector with sections of 50-60 cm in height in the number of 12-14 pieces. The exact number of sections should be calculated based on the area of the room and the technical characteristics of the radiator.
One of the advantages of bimetallic models is that they can be painted in different colors, but only with special colors. Having shown the imagination and talent of the designer, it is possible to create from an ordinary battery an original element of the interior, most appropriate to the style of the room.
To ensure that the battery has served for many years and does not cause problems, it is important to correctly calculate the power of the radiator and decide which model of the company is better to buy. Before choosing bimetal radiators, you need to study the documentation and carefully inspect the product - in this case the probability of buying a substandard product is reduced. Radiators from bimetal are versatile, and therefore perfectly suitable for any purpose.