What does a bimetallic heating radiator mean. Selection and installation of bimetallic batteries. What to look for when choosing

The efficiency of the batteries determines the speed and quality of heating. Market modern equipment offers all sorts of solutions. One of the worthy options are bimetallic heating radiators that meet the main requirements of the heating system: strength, resistance to water hammer, high heat transfer and durability.

We will talk about how to choose the right heating device, in the manufacture of which two metals were used. In the article we have proposed, the varieties popular among consumers are described in detail. Their technical characteristics are given, leading manufacturers are listed.

Externally, bimetallic models resemble ordinary ones. The difference lies in the inner content. The design of composite products consists of two basic elements: internal steel pipe and an external figured-ribbed body made of aluminum panels. Some radiators use copper instead of steel.

The coolant circulates through an internal steel or copper pipeline. Due to the corrosion inertness, the radiators do not rust and do not react with a chemically active coolant. External elements and the inner manifold are connected by spot welding or injection molding.

According to the physical and operational properties, the batteries are suitable for installation in apartment buildings any number of storeys and arrangement of the local heating system of cottage buildings.

The bimetallic structure determines the characteristics of the device. The steel core explains the resistance to aggressive environments and endurance to pressure drops, the aluminum "shell" increases heat transfer and lightens the radiator

Features of different heating convectors

You need to understand the differences between different types batteries made of two metals. Composite products are usually classified according to the following criteria: the composition of the inner rod, the external design and the type of metal used.

Bimetallic and semi-bimetallic radiators

Users often confuse true bimetallic batteries with "half-breeds" - semi-bimetallic counterparts.

"Pure" bimetal

Aluminum is used to make the outer casing of the device. The convector core is 100% stainless steel or copper. During the production process, pipes placed in special molds are filled with aluminum under pressure - a sealed structure is formed.

The outer shell is not in contact with the coolant and acts as a heat exchanger. main feature bimetallic radiators - high strength and guarantee against leaks

A full-fledged bimetal endures the pressure of a centralized and autonomous heating system.

The internal "skeleton" of the radiator is assembled from two metals: vertical guides - stainless steel, horizontal pipeline - aluminum. The reverse combination is also possible.

Such an alliance of metals is not able to ensure the proper reliability of communications. central heating. The coolant may contain alkali, which, in interaction with aluminum, provokes corrosion. Destructive processes eventually "transfer" to the steel components of the radiator.

In addition, the integrity of the product may be at risk due to the thermal expansion of metals - leakage is possible at boundary temperatures.

Externally, semi-bimetallic radiators do not differ from full-fledged bimetallic counterparts. "Half-breed" gives out lighter weight and lower cost

It is better to refuse to buy a low-quality composite, especially when it comes to centralized heating.

Sectional and monolithic models

Among the variety of bimetallic heating batteries, two types of structures are distinguished:

• sectional:
• monolithic.

Models assembled from sections attract with variability of characteristics. They provide an opportunity to purchase the device with exact values heat transfer required for space heating. Monolithic ones do not have such advantages.

Typesetting systems

Collapsible radiators, the panels of which are connected with nipples. Horizontal pipe sections of individual sections have multidirectional threads for joining the mounting nipples and the sealing strip.

Type-setting models are more popular due to their practicality - it is possible to adjust the thermal power by adding or subtracting the required number of sections. An additional plus is maintainability

Disadvantages of sectional radiators:

• joints - weak points of collectors, where leaks are likely;
• limited operating pressure - up to 20-30 bar.

Significant disadvantages also include partial ingress of coolant onto the aluminum "jacket" during leakage.

Monolithic devices

The listed shortcomings are deprived of integral modifications. The cast radiator is able to withstand pressure surges within 100 atmospheres.

Disadvantages of monolithic batteries: there is no possibility to vary the thermal power, overpriced - 20-30% more expensive than sectional models with similar parameters

For high-rise buildings (10 or more floors), experts recommend choosing solid radiators, since there will be significant pressure in the heating system.

Copper or steel core?

Most manufacturers offer steel tube frame hybrid batteries. The main reason is the affordability of the metal and good strength characteristics. The symbiosis of steel and aluminum made it possible to achieve resistance to vibrations, increase the level of heat transfer of the convector and reduce its inertia.

In "copper + aluminum" radiators, the heat exchange tubes are made of copper. Heating panels - aluminum plates soldered to an internal copper frame

Advantages of copper core batteries:

• there is no possibility of corrosion;
• a copper pipeline endures any water hammer - best option for operation in domestic central heating systems;
• high efficiency of the device - the heat transfer of copper exceeds that of steel.

Copper- aluminum radiators have a service life of more than 50 years. The disadvantage of copper modifications is the high price.

Technical and operational characteristics

All basic parameters of the radiator are indicated in the passport of the heater.

In order not to make a mistake with the choice, it is necessary to understand the meaning of the following characteristics:

• heat transfer;
• working pressure and temperature;
• center distance;
• dimensions;
• capacity, section weight.

Thermal power. The parameter indicates the amount of heat transferred from the battery to the room atmosphere at a given temperature (+70°C). The indicator is measured in W.

The average heat transfer value of a composite radiator is 140-190 W. The run-up of values ​​is explained by the dimensions of the section and the features of the execution of devices from different manufacturers

Based on the thermal power of one section, the required battery performance for the entire room is calculated.

Working environment indicators. The maximum coolant pressure depends on the thickness of the steel core. The choice of strength is at the discretion of the manufacturer. The parameter value ranges from 15 to 35 bar and is determined based on the operating conditions of the battery.

An important characteristic is the boundary temperature of the coolant. All full-fledged bimetals are able to withstand +90°C. Some manufacturers claim higher thermal stability.

The maximum temperature declared in the passport of the equipment of different trade items: Global Style - 110°C, Tenrad - 120°C, Altermo - 130°C, Grandini - 120°C

Radiator dimensions. Dimensional characteristics include the following parameters:

1. center distance- "run" between the axes of horizontal collectors. The standard value is 20-80 cm. Vertically oriented models with an enlarged center distance use if the layout of the room is not suitable for the installation of horizontal radiators.
2. Geometric parameters determine the height, width, depth of the section. Overall Height The radiator often exceeds the center range by 6-8 cm. The traditional width of the ribs of bimetallic models is 80 mm.

The depth of the section is 75-100 mm. Some manufacturers, in addition to external panels, add parallel ribs to the design to increase the heating efficiency due to convection currents.

Overall dimensions: a - section height, b - distance between horizontal axes, c - battery depth, d - width of one section. The most popular products with a core height of 35 cm, 50 cm

volume and mass. In bimetallic modifications, the coolant circulates through the core round section unlike aluminum counterparts with an oval-section heat conductor. The capacity of one bimetal section is less than the volume of an aluminum section with the same standard sizes.

For example, in convectors with an interaxal range of 500 mm, the fullness of the coolant is about 0.2-0.38 l, with a core height of 350 mm - 0.15-0.25 l.

The weight of a standard bimetallic battery with dimensions of 580/80/80 mm (height / width / depth, respectively) and a center distance of 50 cm is 1.8-2 kg. A smaller mass is one of the signs of a semi-bimetal.

Comparative analysis: bimetal and competitors

Before choosing a bimetallic or other radiator, it is advisable to compare its capabilities with its closest competitors. For composite convectors, these are aluminum, cast iron,.

The assessment should be carried out according to the main criteria:

• heat transfer;
• endurance to pressure drops;
• wear resistance;
• ease of installation;
• appearance;
• durability;
• price.

Heat dissipation. In terms of heating efficiency, aluminum units are leaders, bimetal takes an honorable second place. Steel and noticeably lose.

Aluminum is characterized by minimal thermal inertia - after starting the system, the air in the room warms up for 10 minutes

Water hammer resistance. The most durable are bimetallic units that can withstand up to 40 atmospheres (sectional models). The maximum working pressure on an aluminum heating network is 6 bar, steel - 10-12 bar, and cast iron - 6-9 bar.

It is bimetal that is able to withstand numerous water hammers of a centralized heating system. This property is a key argument in favor of composite radiators for apartment buildings.

chemical inertness. According to this criterion, the positions were distributed as follows:

1. Cast iron. The material is indifferent to the adverse environment. Cast iron radiators can be used for decades, transporting an "alkaline", "acidic" environment.
2. Steel and bimetal. By itself, the steel core endures the impact of aggressive components. Weakness steel pipelines - interaction with oxygen, contact with which leads to the formation of rust.
3. Aluminum. The metal reacts with various impurities in water.

Aluminum walls are especially susceptible to acidic environments - the pH of the coolant must be within 8. Otherwise, corrosion is actively developing.

Ease of installation. In terms of installation, aluminum and bimetallic products are easier. Cast iron radiators are more difficult to mount due to their impressive mass.

In terms of durability, the leaders are composite and cast iron batteries. Aluminum and steel products at observance of operational requirements are subject to replacement in 10-15 years. Among the indicated batteries, bimetallic ones are the most expensive

It can be concluded. The purchase of a bimetallic radiator is clearly justified for assembling a heating network in high-rise building, where there are risks of pressure surges and contamination of the coolant. In a private house, with stable operation of the boiler and filtration of incoming water, it can be used in affordable aluminum batteries.

What should be considered when choosing a radiator?

To achieve the proper thermal effect, it is necessary to calculate the total power of the battery. Bimetallic equipment is not a cheap purchase, so you should take care of its durability. Conscientious performance of the radiator is guaranteed by trusted manufacturers.

Opportunity assessment - thermal calculation

Having decided on the appropriate technical characteristics and dimensions of bimetallic radiators, it is necessary to calculate the required number of sections.

Basic formula: N=Ptot/Ppas, where Ptot. - the required battery power for the entire room, Ppass. – thermal power of the section according to the accompanying documents

The heat transfer index of the section is taken from the radiator passport, and the total power must be calculated.

Calculation by area

The normalized value of the heat output per 1 sq.m of living space for the middle climatic zone, subject to standard ceilings (250-270 cm):

• the presence of one window and a wall with access to the street - 100 W;
• a window in the room, two walls adjacent to the street - 120 W;
• several windows and "external" walls - 130 watts.

Example. Section power - 170 W, total area heated room - 15 sq.m. Additional terms: window - 1, outer wall– 1, ceiling height – 270 cm.

N=(15*100)/170 = 8.82.

Rounding is performed upwards. This means that for heating the room it is necessary to use 9 sections of 170 watts each.

Volume calculation

SNiP separately regulates the amount of thermal power per 1 cubic meter of premises in the amount of 41 W. Knowing the volume of the heated room, it is easy to calculate the heat transfer of the entire battery.

Example. Space heating with the previous parameters. For the purity of the experiment, the power of the section is left unchanged - 170 watts.

N=(15*2.7*41)/170= 9.76.

It is necessary to install a radiator for 10 sections. The second calculation is considered more accurate. When calculating, attention should be paid to the sources of heat loss inside the room.

The calculated value must be increased by 10% if the apartment is located on the first / last floor, the room has large windows or the wall thickness does not exceed 250 mm

How to avoid fakes: radiator inspection

In addition to the analysis of passport data, it would be useful to conduct a visual assessment of the goods. Some manufacturers, in pursuit of customers, tend to “embellish” their products by introducing incorrect data into the documentation.

First of all, pay attention to the thickness of the core and aluminum "shirt", overall dimensions, weight and quality of components.

The minimum thickness of the steel tube is 3 mm. With smaller sizes, the declared strength of the product is significantly reduced - resistance to and development of corrosive processes.

The walls of thin metal open access for the coolant to the aluminum "shell", which, due to chemical activity, begins to quickly collapse

The result of a low-quality steel core is the formation through holes and creation of emergency situations on the heating system.

Radiator fins. Aluminum panels must be checked for strength - they should not bend from the efforts of the fingers of one hand. The minimum thickness of the panels is 1 mm.

It is better to choose models with profiled channels between the ribs. The formed confuser increases the air flow rate, increasing the intensity of convective heat transfer.

To reduce the risk of injury, the outer edges of the aluminum panels are rounded off. There should be no streaks, color irregularities and “gaps” on the surface

Dimensions and weight. By individual order, it is possible to manufacture radiators with a section width of less than 80 mm. However, store models with an inappropriate parameter are most likely a fake.

Some manufacturers significantly reduce the width of the internal ribs to reduce costs, "masking" them behind standard-sized front panels. This measure worsens the heat transfer of the bimetallic radiator.

Battery accessories. It is almost impossible to check the quality of gaskets and nipples on site. You should rely on the manufacturer's name and the warranty period. Reliable companies guarantee up to 15-20 years of trouble-free operation.

Rating of popular manufacturers

The review includes high-quality foreign heating systems and domestic products adapted to the changeable conditions of heating systems.

• Global Style (Italy);
• Sira (Italy);
• Rifar (Russia);
• Tenrad (Germany).

Place #1 – Global

It is a recognized leader in the production of heating radiators.

The company produces three series of bimetallic batteries:

• Style - basic characteristics;
• Style Extra - compact dimensions;
• Style Plus - maximum heat dissipation.

The sections are connected by paronite gaskets, which ensure the tightness of the joints. Efficient heat transfer between metals is achieved by casting an aluminum "shirt" under pressure.

Additional characteristics: pressure - up to 35 atm, connection diameter - ¾ or ½ inch, coolant temperature - up to 110 ° C, outer shell - double color

Seat #2 - Sira

The Italian manufacturer positions its product as a premium product. The devices have gained popularity among consumers due to their durability and attractive design. The manufacturer provides a 20-year warranty for a series of full-fledged bimetallic radiators Sira Ali Metal.

Characteristics of Ali Metal products: center distance - 350/500 mm, heat transfer of models - 187/141 W (respectively center distance), pressure in the heating network - 35 atmospheres

Seat #3 - Rifar

The domestic manufacturer has developed a wide range of bimetallic radiators:

• Base - models with a center distance of 200/350/500 mm, a guarantee from Rifar - 10 years;
• Forza - reinforced outer coating, resistant to scratches and mechanical damage;
• Alp - shallow depth (75 mm);
• Monolit is a one-piece radiator.

Batteries of the Monolit series are distinguished by the highest performance index at high coolant pressure.

Technical data: working pressure - 10 MPa, bursting pressure - 25 MPa, maximum temperature - 135°C, warranty period - 25 years

Seat #4 – Tenrad

Bimetal German quality suitable for centralized and . It is acceptable to use in gravity, elevator and pumping systems with one- and two-pipe wiring.

Distinctive features:

• thickness of vertical tubes - 1.8 mm, collector walls - 3.6 mm;
• three-row finning;
• the side panels are sloped to create a diffuser effect for convective flow.

double layer enamel coating from high-quality coatings - when heated, the device does not emit harmful fumes.

Tenrad products are designed for operation in a system with a coolant pressure of up to 35 atmospheres. Bimetal radiators are certified and comply with the European standard EN442

He will acquaint you with the rules for calculating the power and number of radiators for a heating device, which you should read before purchasing appliances.

Conclusions and useful video on the topic

The video review clearly demonstrates the design features of composite radiators and the basic requirements that a high-quality device must meet:

Full-fledged bimetallic radiators combine the positive characteristics of both materials. Batteries are characterized by high thermal power, resistance to water hammer and excellent decorative properties. Their acquisition is a justified investment, subject to the purchase of a certified product.

Tell us about how you chose a bimetallic heating device for your own apartment or country house. Share which argument was decisive in your choice? Please leave comments in the block below, ask questions, post thematic photos.

Bimetallic batteries today occupy one of the leading places in popularity. They are inferior in this position, probably, only to the usual cast-iron radiators, and even then, rather, only due to the extreme prevalence of the latter, the commitment of many consumers to established traditions, a kind of “inertia of thinking”.

Bimetallic radiators are increasingly being chosen for installation in the heating circuit of both a private house and a city apartment, since, unlike aluminum and steel, they have a pronounced resistance to high pressure loads and temperatures. However, when choosing these heating devices, it is very important not to run into low-quality fakes or not to purchase products from a manufacturer that has not yet passed the test of time. Therefore, let's consider the question formulated in this way: "bimetallic rating of manufacturers" - since this selection criterion plays a far from secondary role.

It is very difficult to give an accurate assessment of all bimetallic radiators on sale. Therefore, only a few companies will be considered in the publication, but they have already won unquestioned authority with the quality of their products.

General information about bimetallic radiators

Before proceeding to the consideration of products from various manufacturers, a few minutes of attention should be paid to the design of these heaters. It is worth figuring out, at least in order not to purchase aluminum batteries at the cost of bimetallic ones, since outwardly they are very similar, but performance- already at a completely different level, and the difference in price is considerable.

Their outer heat exchange casing has almost the same shape and is made of the same material - aluminum. But that's where the main similarity ends.

Bimetallic models of batteries can be divided into two parts - internal, made of steel, and external, heat exchange, made of aluminum - hence the name. Steel vertical channels of each section consist of pipes, which are connected by welding in the lower and upper parts with horizontal sections larger diameter, which, when assembling the battery, form collectors. All this pipe steel structure intended for the circulation of the coolant.

Sections can be assembled into a single battery by means of a threaded coupling connection, factory welding is less commonly used. Depending on the type of this connection, the battery can be sectional, collapsible, or it can be a one-piece block design. A solid block may include several (for example, 3÷4) sections, but if necessary, it is quite possible to add the required number of sections to it or to assemble a battery from several such blocks.

Steel channels are much more resistant to aggressive components of the coolant of the central heating system than all-aluminum batteries. Therefore, the permissible acid-base index (pH) of the coolant can lie in an extended range, from 5 to 11 units - such indicators aluminum batteries didn't even dream.

Internal steel tubes are a kind of "skeleton" of a bimetallic radiator, which makes the whole structure more rigid and durable. Steel, especially if it has protective covering, or if high-quality stainless steel is used for the manufacture of channels, it is inert to corrosive processes, and the connection of such pipes is able to withstand increased pressure.

This type of battery has excellent heat dissipation, and this is due to the fact that steel is capable of accumulating and retaining heat when warming up, and an aluminum outer case with a sufficiently large area, due to the high thermal conductivity of this metal, effectively transfers heat energy to the premises.

You might be interested in information on how

Almost all modern designs bimetallic devices are equipped with additional "petal" ribs that form convection channels. And the more there are, the more area heat exchange and the higher the heat transfer from the heater. Moreover, these elements are configured in such a way that convection flows warm air head towards the room.

High-quality bimetallic radiators must be rated for a pressure of at least 40 bar, therefore, when choosing them, you must pay attention to this parameter. Special attention. Usually it is indicated as used in product testing. be so surprised high rate it’s not worth it - such pressure may well be provoked in the central heating system by water hammer.

By the way, bimetallic radiators fully reveal their operational capabilities precisely under conditions of high pressure and heating temperature, therefore they are preferable for central heating systems. And if this type of batteries is planned for an autonomous system, then a powerful water pump will have to be installed in it, which will create the necessary pressure for the circulation of the coolant.

You may be interested in information about what

Popular manufacturers of bimetallic radiators

On the Russian market there are products of various manufacturers, both domestic and foreign, and their products differ from each other both in their characteristics and in the price level. To give an idea of ​​these parameters, a number of models of bimetallic radiators manufactured by different companies will be considered next.

And it’s worth starting with the most affordable option.

WARMA Co.

WARMA is a Russian-Chinese company that produces sectional cast bimetallic radiators. Production facilities are located in China, but they are equipped with high-quality European equipment, and the technical control of manufactured products is carried out by Russian specialists.

These products fully comply with GOST 31311-2005 and all other standards of the Russian central heating system.

Bimetallic batteries "WARMA" are designed for installation in autonomous circuits of private houses, and apartments of high-rise buildings connected to heating plants.

Models "WARMA BIMETALL" are produced in two versions - WB350 and WB500. They differ in center distance and, accordingly, in some other operating parameters. The main characteristics of these batteries are summarized in the table below.

The steel core of these radiators is made of carbon steel - its vertical channel has a wall thickness of 2 mm and an inner diameter of 20 mm, and the steel thickness of the horizontal collector sections of the sections is 4 mm.

The manufacturer declares the following technical and operational characteristics of its products:

To make it easier for the consumer to decide on the choice of the number of WARMA radiator sections required for space heating certain area, the manufacturer presents tables indicating the recommended solution.

Model WB350 with a height of 410 mm, a depth of 80 mm and a center distance of 350 mm, are assembled into batteries from a different number of sections and have the following heating options when assembled:

The WB500 model, having a height of 560 mm, a depth of 80 mm and an interaxal distance of 500 mm, composed in a single structure, also from a different number of sections, has a greater heat transfer, which is:

In order not to return to this issue, it should be noted right away that this approach to quantification radiator sections only by the area of ​​\u200b\u200bthe room - very approximate. It does not take into account many other features of the room and the way the batteries are installed. Therefore, in the appendix to this article, a convenient universal calculator will be provided that allows you to calculate the number of radiator sections of any brand with high accuracy.

The cost of one section of the WARMA radiator is approximately 450÷500 rubles for the WB300 model, 600÷630 rubles. for the WB500 model. The price level, of course, may vary slightly in different regions countries.

Radiators "Könner"

"Könner" - despite the clearly German-language name, a Russian company is registered under this trademark. Its products (again, completely Russian-made) are in no way inferior in quality to other European counterparts, as they are designed on the basis of modern technologies and taking into account the peculiarities of the regions of Russia. The main production facilities of Könner are located in China.

The company began its work on the production of cast iron batteries about 25 years ago, but was sensitive to market demands, and launched into the development and production of more modern appliances heating. So, already in the early 2000s, aluminum and bimetallic radiators of their own design began to arrive in Russian construction stores. In this short period of time, the products managed to become quite popular, thanks to its affordable prices and high quality.

The company's engineers, knowing the special specific conditions of the Russian central heating system, improved and adapted the technical characteristics of the devices, the design of which was taken as a basis. That is why these models of radiators compare favorably with other foreign analogues. Due to their reliability, Könner radiators are suitable for installation in both central and autonomous heating systems.

Heating devices of this brand have high anti-corrosion characteristics, have good resistance to pressure loads, calmly withstanding water hammer. Radiators owe their reliability to strong pipes, vertical pipes and a horizontal collector, which are made of high-alloy steel and are the backbone of the structure. Die-cast aluminum body with large contact area for excellent heat dissipation.

The high quality of Könner products is confirmed by international ISO certificates and full compliance with domestic GOST 31311-2005, section "Heating appliances". The products of this manufacturer have repeatedly occupied the first places in the Russian Federation in terms of consumer demand.

The technical characteristics of these products are presented in the table:

Bimetallic radiators "Könner" go on sale in sectional and block versions. The block can include from 4 to 12 sections. The price for one section averages from 400 to 500 rubles. It is more profitable to purchase a block version - the prices for a block decrease as the number of sections increases, and can even be less than 400 rubles per section.

Radiators "TENRAD"

"TENRAD" - a company producing radiators, was established in 2005 in Germany in the city of Dresden. The enterprise was organized by young talented engineers working in the direction of design heating systems.

Like many other companies, the production of these heaters, due to favorable conditions in the labor market, was located in China. The TENRAD radiator manufacturing plant is equipped with its own chemical-technological laboratory, state-of-the-art metal casting complexes Farm New Brass, robotic manipulators developed by the German company Kuka and body painting lines made in Switzerland. All this equipment has turned a small factory into a high-tech enterprise, in no way inferior to the leading European factories. The production of radiators is carried out under the watchful supervision of German specialists-technologists of the parent company TENRAD.

The walls of the TENRAD BM radiator collector on horizontal channels have a thickness of 3.6 mm, and on vertical channels - 1.8 mm. The fins, installed in three rows, create two convection gaps in the upper part of the radiator, through which the heated air enters the room. Radiators are covered with high-quality paint and varnish compositions in two layers, and the outer one consists of sprayed epoxy polyester, which meets the requirements of SanPiN 2.1.2.729-99 and RD 52.04.186-89 standards, which establish the hygienic safety of materials. In addition, TENRAD BM products comply with GOST 31311-2005, which confirms their adaptation to Russian systems heating.

Prices for bimetallic radiators TENRAD

bimetal radiators TENARD

The technical characteristics of these devices are as follows:

The average cost of TENRAD VM radiators is from 620 to 720 rubles per section, but it can vary up or down, depending on the region of the country. You can purchase batteries already assembled in blocks of 4÷12 sections.

Bimetallic radiators "Radena"

Radena is an Italian company whose office, design bureau and testing laboratories are located in Italy, but the products themselves are manufactured again in China, at the WANGDA Group plant, under the close supervision of Italian specialists.

This brand of radiators has decent quality and good adaptation to Russian networks heat supply, so negative feedback hard to find about them. Products have been presented on our market since 2010, and during this time they have gained wide popularity, despite the relatively high price. This is explained by the fact that buyers are attracted by the quality and reliability of these radiators.

The model range is represented by three items - with different center distances: 150, 350 and 500 mm.

The design features of these radiators include the following:

• Self-centering gaskets installed between sections are made of graphite, so there will be no distortion during assembly and disassembly of the battery. Thanks to this, a high degree of sealing is achieved, and no leaks form at the joints.
• The threads on the joints of the sections are absolutely even and never filled with paint.
• The ends of the radiators are perfectly cleaned and ready for installation.
• High-quality factory packaging reliably protects products from damage during transportation.

This brand of radiators is one of those products that are characterized by increased thermal conductivity and durability. All manufacturing materials fully comply with environmental European standards.

This table presents the technical characteristics of different-sized Radena models:

All surfaces of these radiators, both internal and external, undergo a special anti-corrosion treatment before painting. After that, they are dipped in a bath of paint, and then dried well and subjected to a second stage, during which a top layer of high-strength epoxy is sprayed.

The price of Radena radiators with different center distances may vary not only depending on this parameter, but also on the region where they are purchased. So, "CS150" - 420÷500 rubles; "CS350" - 600÷800 rubles; "CS500" - 645÷ 850 rubles.

Radiators "Rifar"

"Rifar" is a widely known domestic manufacturer, specializing in the manufacture of aluminum and bimetallic batteries. Bimetal heaters are equipped with an internal monolithic manifold made of steel and housed in an aluminum housing. Batteries are produced with bottom and side connection, in three sizes.

Production facilities are located in Russia, in the city of Guy, Orenburg region. The equipment of automated lines, from the beginning to the end of the entire technological chain, is at an ultramodern level.

Heating appliances of this brand comply with European quality and Russian regulatory documents GOST 31311-2005, TU 4935-004-41807387-10. This version of radiators is mostly intended for installation in multi-storey residential and administrative buildings, as they have high strength and performance characteristics suitable for domestic heating systems.

• "Rifar Monolit" is produced in two dimensional versions - with a center distance of 500 and 350 mm. Due to the fact that this “Rifar” range is highly resistant to corrosion processes, housing managers often recommend it for installation in apartments of multi-storey buildings.

The technical and operational characteristics of Rifar Monolit radiators look like this:

The average price for domestic radiators "Rifar Monolit" is quite high and is approximately 715 - 850 rubles, but it can also vary and be different for individual regions.

• Another model line of bimetallic batteries from this company is Rifar Base Venti. It, in turn, is divided into three options, which have a center distance of 200, 350 and 500 mm.

In terms of color quality and design, the models of this series are more aesthetic than those of Rifar Monolith, however, they are significantly inferior to them in terms of their technical and operational characteristics. Therefore, the manufacturer gives a guarantee for these products for only 10 years, and estimates the operational period at 25 years.

Prices for bimetallic radiators Radena

bimetal radiators Radena

It should be noted here that the manufacturer clearly warns that this battery option is more suitable for autonomous heating systems, since all indicators are designed specifically for it. For example, "Rifar Base Venti" radiators require a clean coolant, which can only be provided in an autonomous system. In addition, the test and operating pressure of these heaters is several times lower than that of Rifar Monolit.

So, the main technical and operational characteristics of this line are as follows:

The cost of radiators of this line is quite high, it is 725 ÷ 900 rubles per section, but it can also vary.

Bimetal radiators "Fondital"

The Fondital company was founded in 1970 in the city of Weston in the Italian province of Brescia, and since its inception has been engaged in the design and manufacture of heating systems. Over the years of work and constant development, a small enterprise has turned into a large company with several large production facilities. Today, Fondital is one of the world leaders in the design and manufacture of devices and accessories for heating systems. From heat exchange devices, this manufacturer mainly produces aluminum radiators, but there is also a bimetallic model in its assortment, which is quite popular among consumers.

The bimetallic model "Fondital" has a name that speaks for itself - "Alustal", and is designed for installation in central system heating of multi-storey buildings.

"Fondital-Alustal" is characterized by the following technical and operational indicators:

Radiators "Fondital-Alustal" can be block, and the batteries presented for sale can include from 4 to 14 sections, to which additional blocks or separate sections may well be added. Devices are quite expensive: average cost one section in different regions of the country is 740÷950 rubles.

The manufacturer provides a guarantee for the free elimination of all types of manufacturing defects for a period of 20 years from the date of installation. However, such a guarantee is valid only if the installation is carried out by a qualified craftsman in compliance with all the installation conditions specified by the manufacturer in the product passport.

Radiators bimetallic company "Global"

The Italian company "Global" was founded in 1971 and, we can say that it stood at the very origins of the development and production of aluminum radiators. Having come a long way from a small workshop, where assembly was carried out by hand, to industrial automated workshops, today the Global company manufactures not only aluminum options heating appliances, but also four models of bimetallic radiators of different sizes.

The company has its own testing laboratory, in which all raw materials entering the enterprise are subjected to strict quality control. The development of new models and the improvement of technical and performance characteristics existing product samples. The Global company issued certification for the production of radiators according to the ISO 9002 and ISO 9001-2000 European standards, and in 1996 the products of this manufacturer were also certified in the GOST RF system. Year by year, the demand for heating appliances of this company is growing, which indicates a high consumer confidence in products under the Global logo.

The main characteristics of bimetallic radiators produced by the company are given in the table:

The color gamut of GLOBAL bimetallic radiators is wider, but the coloring of released models is often carried out at the request of consumers, and white glossy remains the standard color for batteries.

Bimetallic radiator "GLOBAL STYLE PLUS" 500 - 7 sections in basic color

All radiators go through a two-stage painting process. The first stage is to immerse the products in special bath and is called anaphoresis. The second stage includes spraying onto the prepared surfaces of a coloring substance based on epoxy resins with the addition of a coloring pigment.

As you can see from the table above, GLOBAL produces four models of bimetal radiators, named Style, Style Extra, Style Plus and Sfera. Each of the models is available in two versions - with center distances of 350 and 500 mm. The table also shows the difference in some parameters of the radiators of this manufacturer - it is easier to navigate when choosing batteries for specific conditions.

Pay attention to the warranty period - 20 years. This once again indicates that the manufacturer is completely confident in the quality of its products.

The price of GLOBAL radiators is quite high (the highest of all those discussed in this publication), but they are justified by the reliability, durability and efficiency of the devices. Thus, the average cost of one section of a heater starts from 800 and reaches 1200 rubles. More information about the price can be found on this link.

Application: How to independently calculate the number of sections of a bimetallic radiator

The method of calculation often practiced, based on 100 W of thermal energy per square meter of area, is not accurate - each of the premises has its own characteristics, which must also be taken into account. Therefore, we will take the liberty of offering the reader a more accurate algorithm, which is implemented in the program of the calculator located below.

Necessary comments on the calculation program

A few brief explanations for the calculations:

• The total amount of heat loss is affected by the presence and number of walls in contact with the street, as well as their location on the cardinal points and in relation to the prevailing winter winds. The program provides the appropriate input fields for these data.
• The climatic features of the region will be taken into account when specifying the minimum winter temperatures. In this case, it is necessary to indicate not anomalous, but quite normal frosts for your region in the coldest decade of winter.
• The wall insulation parameter may raise questions. Here it is better to approach from those positions that a wall is considered to be fully insulated, the thermal insulation of which was carried out in full on the basis of the performed heat engineering calculations. There should be no uninsulated walls in residential buildings at all - no heating will simply help with this approach: it will still be cold in the room, and the walls will be damp.
• Features of the room, that is, its height and proximity from below and above - directly affect the required amount of thermal energy to warm up the volume of the room and replenish heat loss through the ceiling.
• After entering the parameters of the windows, the program will calculate the percentage of glazing (of the area of ​​the room) and enter the appropriate correction factor. A similar approach is if there are regularly opened doors to the street or an unheated balcony.
• Finally, the overall heat transfer from heating radiators is significantly affected by the scheme of their connection to the circuit and the location on the wall. All this is taken into account by the calculation algorithm.
• Attention! The program is capable of producing two totals.

- If the calculation for a non-separable radiator model is selected, then the result should be taken into account "BUT"- this is the required total radiator power for a given room, expressed in kilowatts.

You may be interested in information on what to guide when choosing

Prices for popular bimetallic heating radiators

- If the goal is to calculate the number of sections of a collapsible radiator, then after choosing this path, additional field, in which it is necessary to enter the nameplate power of one section of the selected model (in watts). The result is taken from the item "B"- this is the required number of sections, rounded up to the nearest integer.

Bimetallic heating radiators: features, types, how to choose

Today, various types of radiators are used to heat the house. The most popular are bimetallic batteries that combine the properties of steel and aluminum. In the article we will consider design features, the pros and cons of such batteries, and also answer the question: how to choose bimetallic Radiator?

Bimetal heating radiators

How bimetallic radiators are arranged

As already mentioned, two materials formed the basis of bimetal batteries: steel and aluminum. The inner part of the structure (pipe), through which the process of movement of the coolant is carried out, is usually made of stainless steel (sometimes copper). This metal is very strong and does not lend itself negative influence aggressive environment of the heated coolant.

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The outer side is made of aluminum and is a casing with fins. Aluminum has a high thermal conductivity, warms up to the maximum short time and the air in the room begins to warm up instantly.

Device bimetallic radiators

The inner and outer parts of each section are joined together by casting. This process is carried out under pressure or spot welding. By means of steel nipples and heat-resistant gaskets, which are able to withstand a maximum temperature of not more than 200 ° C, the sections are assembled into a battery.

The fact that in the design bimetallic radiator there are parts made of steel, due to a number of positive characteristics that this metal possesses:

• steel is able to withstand pressure drops;
• steel is highly resistant to electrochemical influences, while aluminum internal surfaces rust quickly, and therefore their service life is short.

However, in turn, aluminum is characterized by high thermal inertia. On the one hand, this is a virtue, but on the other, a kind of disadvantage. Aluminum surfaces very quickly give a reaction even to minimal changes in temperature. Thanks to this property, you can very quickly adjust the temperature parameters of the heated room.

Due to the high heat transfer of aluminum, less coolant is consumed, while the amount of heat given off is identical to that of cast iron radiators. That is why the dimensions of bimetallic heating radiators are more compact, and the shapes are very attractive in appearance.

Pros and cons

By purchasing an installation made of bimetal, your heating system will be provided with many positive aspects:

1. First of all, it is a long service life. Due to the high quality of the construction, in which two good materials are combined, such radiators can work effectively for 30-50 years.
2. Durability and reliability. These qualities are ensured by the steel core, which is able to withstand high working pressure and water hammer.
3. Bimetal heating radiators are suitable for any heating system, even with low quality coolant.
4. High heat transfer is another important positive quality. Due to the fact that the outer case is made of aluminum, heat is distributed throughout the room very quickly. Standard models, in which the distance between the axles is 500 mm, have a heat output of up to 190 W, which is much more than in radiators made of only one metal.
5. Thanks to the built-in, you can control and regulate the heating temperature.
6. Externally, bimetal batteries are very attractive. Various colors and design solutions allow everyone to choose a radiator to their taste.

As you can see, bimetallic radiators a large number of pluses, causing a wide demand for such products. However, there are some disadvantages that should not be ignored when choosing:

1. Different coefficients of expansion of steel and aluminum. For this reason, after prolonged use in heating circuit noise and squeaks may occur, and the strength of the structure will be lower.
2. During the installation of radiators in the central heating system, heat pipes can quickly become clogged. This is due to the fact that they have a small diameter. Given this feature, it is better to be careful and install a coarse filter.
3. The high price of bimetallic radiators.

Varieties of bimetallic radiators

Radiators made of bimetal are of two types: monolithic and sectional.

Sectional ones are designed from sections, each of which has a multidirectional thread inside the horizontal pipe sections on both sides, through which connecting nipples with sealing gaskets are screwed.

It is this design that is one of the most important shortcomings of bimetal batteries. The downside is that defects very often appear at the joints, for example, from a low-quality coolant. As a result, the operating period of the radiators is reduced.

Also in the areas where the sections are connected, under the influence high temperatures leaks may be observed. To avoid such unpleasant moments, another technology for the production of bimetallic heating radiators has been created. Its essence lies in the fact that initially a one-piece welded steel manifold is made, then it fits into special form and under the influence of high pressure, aluminum is poured over it. Such radiators are called monolithic.

Both varieties have their advantages and disadvantages. We have already talked about the disadvantages of sectional ones, but their advantage is that if one section is damaged, then it is enough just to replace it. But, if a breakdown or leakage occurs in a monolithic structure, you will have to purchase a new radiator.

Let's carry out a comparative analysis of monolithic and sectional bimetallic radiators.

The cost of a monolithic radiator is higher than that of a sectional radiator by about 20%.

The choice of bimetallic heating radiators

When choosing bimetallic batteries, you should pay attention to a number of criteria on which the operating efficiency will depend.

Design

As already noted, radiators can be monolithic and sectional. In order to choose the most optimal option for a particular heating system, you need to know what the working pressure in the system is. If it is exposed to powerful water hammers, then it is better to give favor to monolithic models. In all other cases, it is recommended to purchase sectional ones, since they are much cheaper.

To purchase a more reliable device, you should know that there are two types. The first type is made of a steel frame, the other is supplied only with steel-reinforced channels through which the coolant moves.

Batteries belonging to the first type are characterized by greater strength and reliability. In such designs, the coolant does not come into contact with the aluminum alloy, as a result of which the risk of corrosion is minimal.

The main features characterizing the first type are weight and cost. They are produced by the following companies: Royal Thermo BiLiner, Global Style, Rifar (Model Monolit) and domestic company Santekhprom BM.

Another type is called semi-bimetal radiators. The main characteristics of such devices are high heat transfer and lower price. Most popular device brands Gordi, Sira and Rifar, excluding Monolit.

center distance

Most of the manufactured models of bimetallic radiators are equally functional. However, the distance between the axles of the models varies. Standard indicators of the distance between the axes: 35 and 50 cm.

You can find radiators in which the gap is 20 cm, this length is considered the minimum. Batteries with such a distance are manufactured by companies: Sira, BiLUX and RIFAR. The maximum distance is 80 cm, such models are available from the manufacturer Sira.

Production material

It is important that the radiator is well resistant to the effects of an aggressive environment in case the coolant is of insufficient quality and contains a large amount of alkali and acidity. This is mainly typical for batteries in apartment buildings.

1. It is important that the internal channels are made of one metal, preferably stainless steel.
2. The wall thickness of the inner pipe should be 3-3.5 mm.
3. A very important role is played by the quality and elasticity of the pads. It is they that affect the reliability of the connections, so usually rubber or silicone acts as the material for their manufacture. To check the quality of the sealing ring, it is enough to bend it with your fingers. If the gasket is stiff and inelastic, then this indicates its poor quality.
4. If the radiator is sectional, then here you should pay attention to the nipples. It is important that they are made of high quality steel. The low quality of these parts is evidenced by the softness of the metal. If it is of poor quality, then the hooks for the key will definitely break off and in this case the nipple will need to be sawn with a grinder and its parts removed from the section holes.
5. The width of the front part of the radiator fin should be more than 70 cm. If this figure is lower, then this will affect the heat transfer of the radiator in a negative direction. The most optimal ratio of section size to section is 80*80 mm. With such indicators, heat transfer will definitely be high.
6. The thickness of the protruding ribs is also indicative of quality. This indicator should not be lower than 1 mm.

Guarantee

The warranty period also indicates the quality of the product. If the manufacturer gives a service life of only 1-2 years, then this means that the likelihood that the radiators will work with high efficiency is small, because. operational period quality product is 20-30 years old.

Specifications

Battery specifications include dimensions. The height of the radiators is from 20 to 80 cm. To choose the right size radiator, you need to take into account the distance between the base of the window and the floor and subtract 20 cm from this number. The width is directly dependent on the place where the device will be installed.

Another important indicator is the working pressure, which varies between 15-35 atm. For centralized heating systems, it is better to choose the maximum values, for autonomous ones, you can also choose the minimum.

One of the most important and significant criteria affecting the efficiency of radiators is power. This indicator is determined based on the power of one section (it is indicated in the data sheet).

Calculation of sections of bimetallic heating batteries

In order to effectively heat 1 m² of area, you need 100 W of thermal energy. To calculate the area of ​​a room, multiply the width by the length.

N= S*100/P N is the number of radiator sections, S is the area of ​​the room, m², P is the specific thermal power of one section.

Use the calculator for calculating the required number of sections of a bimetallic radiator.

Installation of heating radiators from bimetal

Bimetal batteries must be installed in accordance with the instructions specified in the device's passport.

In order to connect the radiator with your own hands, you need to consider a number of factors:

• as a location for the battery, it is better to choose the middle of the window;
• installation is carried out exclusively in a horizontal position;
• from the wall to the battery, you need to maintain a distance of 3-5 cm. If you place the radiator too close to the wall, then the result will be an uneven distribution of heat;
• the distance to the window sill should be 8-12 cm, if it is less, then this will negatively affect the heat transfer of the batteries;
• the distance from the floor to the battery is 10 cm.

Installation of all elements of the system is carried out in a polyethylene package of the radiator. Do not remove this packaging until the entire installation process is completed.
The procedure for performing the installation of bimetallic heating radiators:

• initially it is necessary to mark the intended area on the wall where the brackets will be attached;
• then the brackets are fixed;
• batteries are installed on them;
• then the radiator must be connected to the pipes;
• then a thermostatic valve or faucet is mounted;
• an air valve is installed at the top of the battery.

Manufacturers

Currently, on the heating equipment market, you can find a large number of different models of bimetallic radiators manufactured by both Russian and foreign manufacturers. Consider the main characteristics of the most popular models.

Thus, high-quality bimetallic heating radiators are able to work effectively for a long period of time.