Bimetallic heating batteries which are better. Which bimetallic radiators are better - expert advice. Opportunity assessment - thermal calculation
Bimetallic heating radiators have recently become an integral part of the heating system. planning overhaul residential or office space, it is impossible to ignore the work on updating heating devices. The most progressive and cost-effective is the use of bimetal radiators, which are able to supply heat evenly and are also attractive from the point of view of modern interior aesthetics.
More and more we see how the apartments of compatriots are changing. Repair acquires a broader concept than the banal plastering of cracks. Increased attention is paid to design. Even choosing conventional batteries for an apartment, the owners tend to buy bimetal radiators heating with a concise, attractive appearance.
Why exactly bimetallic heating radiators? - you ask. D reality, common sense and optimal prices make this productwe will answer the most popular heating batteries. And we will try to reveal all the pros and cons, while not forgetting to take into account the internal content of the devices.
Uniform distribution of heat by bimetal heating radiators
Bimetallic heating radiators in modern heating appliances
Cast-iron radiators have long been replaced by bimetallic radiators. What distinguishes them from post-Soviet models is Beautiful design lightness and protection against corrosion. The reputation of the best and most reliable batteries for heating an apartment is so great that even desperate skeptics do not argue with this.
The very name of the batteries suggests that bimetallic heating radiators are made up of two different metals. passes through steel pipes, which are least susceptible to corrosion. The steel is wrapped in aluminum, which has good heat dissipation qualities and a beautiful appearance.
Note that in addition to steel, a system of copper pipes can be packed into aluminum by the manufacturer. Such a design is indispensable if the batteries for the apartment are mounted in systems where it is used. The presence of glycol-containing coolants will require the owner to opt for bimetallic heating radiators on models where copper is used as a core, since it is more stable in such an aggressive environment.
You can find on sale and semi-bimetallic options. Here, the internal filling of the radiator is represented by a double core. Horizontal elements made of aluminum, and vertical steel. This increases heat dissipation but reduces durability.
Internal filling of bimetallic heating radiators
As we noted, bimetallic heating radiators include two metal element in addition, they are made in an all-metal case or contain composite sections. Despite the fact that there are semi-bimetallic options, however, bimetallic heating radiators have the main division into only two categories:
- modification steel plus aluminum;
- modification of copper plus aluminum.
Category of radiators “steel plus aluminum”, includes two steel pipes running horizontally like a collector, they are connected to each other by vertical columns that are mounted in. The coolant flows inside the steel tubes without coming into contact with aluminum.
The constructive solution allows you to use all the charms of an aluminum radiator, additionally counting on a working temperature of + 110 C with a pressure of up to 40 bar. Sealing the joints of the sections allows you to exclude leaks, provided there is no frank marriage. To the advantages of sectional models of bimetallic heating radiators, a simple increase in the number of sections is added at the request of the consumer.
Copper plus aluminum design does not involve sectional modeling, bimetallic heating radiators with a copper core are always made in a single and integral case. Inside the aluminum case battery, there is a copper alloy coil. Brazed coil, capable of operating with a working pressure of 50 bar.
The advantages are not only in the increased working pressure, the thermal conductivity of copper metal is higher, respectively, the radiators have an increased thermal output. The most important advantage of a bimetallic heating radiator with a copper core is the low susceptibility to carbonate deposits in it during the corrosion process.
The radiator is perfect for a system where the coolant includes various antifreezes. In this battery, the coolant comes into contact only with copper. Among other things, bimetallic heating radiators with copper pipes have a low roughness coefficient, which favorably affects the operation of the pumping group.
What to choose - a section or a monolith?
When buying bimetallic heating batteries, you should pay attention to the design features. The most common are sectional radiators, as they were among the first to appear on the market. Such radiators will require pressure testing, as there is a possibility of leakage due to insufficiently reliable joints.
Recent modifications are already favorably distinguished by their solidity. The coolant is a one-piece unit made of copper or steel, dressed in an aluminum case. It is these batteries for an apartment that you should choose, since their performance is much higher than that of sectional radiators. Despite the fact that thermal power these varieties are almost the same, on monolithic ones it is allowed operating pressure 5 times higher.
Quality always costs more, so you have to take into account the possibilities of your own budget. If the price does not matter, then it is better to install monolithic bimetallic radiators at home. And design views and battery modifications can be selected for every taste.
The use of bimetallic heating radiators is becoming more and more popular not only for private houses and apartments, but also in enterprises and company offices.
The growing popularity is explained high efficiency of these devices and the attractiveness of their external design. Bimetal radiators fit perfectly into the interior of any style, without violating its harmony and beauty.
Bimetallic radiators: advantages and disadvantages
When compared with aluminum counterparts, bimetallic radiators are slightly inferior to them in heat transfer. But they are significantly superior in strength and service life. Bimetal is less susceptible to corrosion and is able to withstand high water pressure (up to 24 bar). As for the price, it is noticeably higher than that of aluminum radiators. However, the bimetal option will last at least 25 years and will fully justify the high cost.
Buy bimetal radiators for home or office
Today, specialized stores offer wide selection models from different manufacturers supplying excellent products to the consumer market. These are firms such as Global, Rifar, Sira and many others.
Those who wish to buy bimetallic radiators for home or office should take into account the area of the room and purchase a sufficient number of sections, because their number affects the efficiency of the installed radiator. We will not describe the calculation of the number of sections in this article, firstly, this has already been done, and secondly, we are posting a video clip where the calculation of the number of sections in heating radiators is described in as much detail as possible:
Bargain Rules
In order for bimetallic radiators to serve for a long time, you should purchase them in stores with a solid reputation. Before buying it will be quite superfluous:
- make mathematical calculations that will help to coordinate the footage of rooms and the number of sections in the battery;
- take into account the features of the selected model;
- study consumer reviews;
- weigh your financial options.
Heating radiators Sira (Sira) (bimetallic)
The domestic consumer is well aware of the reliable, practical and high-quality products of the Sira Corporation, a reputable Italian manufacturer of heating systems. Made of steel and designed for heating a variety of public, warehouse and residential premises.
The entire model line of bimetallic heating radiators, in addition to traditionally high performance, is distinguished by an up-to-date stylish design, which allows you to use the product without the slightest harm to interior design. The center distance of such a model is only 30 cm, and its depth is 9.5 cm. Also, Sira heating radiators (Sira) (bimetallic) have excellent technical properties and exceptional performance.
The viability of Sira products has been proven by their many years of effective use in domestic conditions and is determined by the multi-level control of all production processes and stages. So, each section of a SIRA bimetallic heating radiator? of a particular product - is subjected to separate testing, and the assembled heating device is necessarily compressed with compressed air.
The entire range of Sira products perfectly resists pneumatic and hydraulic shocks, due to which it is resistant to pressure drops. calling card Such a radiator is justifiably considered to have high heat transfer and a long service life.
The absence of welding seams of Sira bimetallic heating radiators, which is achieved by pouring the structures under pressure, determines the tightness of the products. The coolant circulates through a special internal channel, which is made of first-class, corrosion-resistant steel.
Heating radiators Sira (Sira) (bimetallic) do not require operational repair intervention or additional maintenance. Maximum comfort and comfort in rooms heated by Sira heating devices is achieved due to the zero level of noise inside the device itself and the ability to quickly and flexibly adjust the temperature regime.
Particular emphasis is the Italian concern manufacturer “ Sira group” doing on safety own products, which is ensured by the absence of sharp corners and all kinds of burrs. hallmark bimetal heating radiators Sira is its proper economy. Thus, the minimum amount of coolant and the high heat transfer of each design make it possible to optimize the cost of the energy carrier.
Popular bimetallic heating radiator Syrah
The most popular on the market is the Sira RS BIMETALL series. Model Sira RS 300, Sira RS 500 The figure indicates the height of the section, corresponds to the dimensions of the height - 372 mm and 565 mm with the same width - 80 mm and depth - 95 mm.
Comfortable dimensions, make it possible to mount the radiator in rooms with different heights of window sills. The standard sectional assembly comes in even numbers from the factory. Any changes in the individual request are carried out by the seller company. If you wish, within reason, you can order bimetallic heating radiator of suitable length. reasonable limit, Company " Sira Group” limits assembly regulations to no more 20 sections.
Bimetal heating radiators of the Sira brand are allowed to be connected both in the gravitational and in the forced circuit system. The acidity range of the coolant should not exceed (6.5−9 pH). Design temperature should not exceed 110 degrees.
A heating device is called bimetallic, in the design of which two metals are used simultaneously: steel and aluminum. At the same time, a bimetallic radiator combines all the advantages of both metals: it has a high heat dissipation of aluminum, as well as strength, reliability and resistance to corrosion, characteristic of heating devices made of steel.
How is a bimetallic heating radiator arranged?
Outwardly, to distinguish a bimetallic radiator from a conventional aluminum heating device is not easy even for an experienced craftsman who has installed a lot of heating devices. At first glance, they look exactly the same: it is true that the bimetallic radiator is slightly heavier, but this does not mean at all that a more massive and heavier radiator is necessarily made of two metals.
The main difference lies under the outer shell, or rather under the outer plates of the heater, made of aluminum and attached to the core of the radiator, made of steel pipes. Thanks to this design, the coolant moves only through steel pipes and does not come into contact with aluminum. At the same time, the outer shell of the heating device, made of aluminum, quickly heats up upon contact with hot steel and effectively transfers heat to the surrounding space. Predominant in this case (as well as in aluminum radiators) is convective heat transfer.
This design results in unique performance characteristics bimetallic heating radiators, namely:
Ability to withstand operating pressure in the heating system up to 20 atm and pressure testing up to 60 atm
Ability to operate at coolant temperatures up to 130 C.
Of course, in a conventional autonomous heating system, such parameters are hardly achievable, and there is simply no need for them, but such performance characteristics can be safely called a “real find” for those who decide to install real steam heating in their home. Bimetallic radiators will also come in handy for those who want to be absolutely sure of the reliability and durability of their heating system and are afraid of leaks.
In heating systems with bimetallic radiators about possible emergency situations and the associated risk of flooding the neighbors from the lower floors can be forgotten.
How to choose a bimetallic heating radiator?
When choosing bimetallic heating radiators, you need to know that not all heating devices, on the label of which two metals used in their design appear at once, are equally good and reliable.
The fact is that today on the market heating equipment 2 types of bimetallic radiators are presented:
Instruments whose core is entirely made of steel. They can be conditionally called “100% bimetallic” or completely bimetallic.
Devices reinforced with steel, which can be safely called "semi-bimetallic", in which aluminum is in contact with the coolant, which means that it simply does not make sense to talk about any corrosion resistance, reliability and strength.
It should be noted that semi-bimetallic radiators are often passed off as full-bimetallic ones, selling them at almost the same price. When buying such a heating device, the consumer acquires a low-quality product, the service life of which is unlikely to be long.
How to avoid deception?
Semi-metal radiators are heating devices in which steel is used only to reinforce the structure. Usually vertical channels are made from it, connecting the upper and lower collectors. In this case, the radiator housing and horizontal channels for the movement of the coolant are made of aluminum. Reliable connection these two metals is impossible: the vertical channel is simply installed in the radiator housing and is not fixed by anything.
It is clear that during installation or simply due to careless handling, the vertical channel may shift, which will lead to the formation of a leak.
It is not uncommon for unscrupulous manufacturers to make only nipples out of steel, calling radiators bimetallic heating devices.
Deception can be detected using simple magnet. It is enough to bring it to the radiator and, by the level of attraction, determine where there is steel in the heating device and where it is not. You can buy only those radiators in which horizontal collectors and channels for the movement of the coolant are made of steel, connecting them, which is possible only in full bimetallic radiators.
The choice is made: we take full bimetallic radiators!
In turn, fully bimetallic radiators are monolithic and sectional.
Sectional bimetallic heating radiators consist of separate sections, which are then connected into a single heating device. Each section is made from a steel billet, which is two horizontal pipes(core), interconnected by a vertical pipe of smaller diameter, filled under pressure with aluminum melt. The result is a strong and robust construction from a steel base designed for the movement of the coolant, and an outer aluminum casing that effectively transfers heat to the surrounding space.
When connecting sections, various seals are used to ensure the tightness of the heating device.
The distance between the cores can be different from 20 cm to 120 cm or more, which allows the production of radiators various heights and thermal power, suitable for heating almost any room.
If desired, a heating device of almost any thermal power can be assembled from separate sections.
Among the disadvantages of sectional bimetallic radiators, one should mention the vulnerability of connecting individual sections to each other, which makes it impossible to use them in heating systems filled with antifreeze, as well as in autonomous systems with steam heating. (leakage may occur at the junction of sections)
Sectional bimetallic radiators can work with a coolant heated to a temperature of 95 C and work for a short time when the coolant is heated to 115 C, withstanding pressure in the heating system up to 3.5 MPa.
Monolithic bimetallic radiators
More reliable and durable are monolithic bimetallic radiators, in the design of which there are no separate sections. Inside them, the steel channels through which the coolant moves are connected by welding into a single structure, which is then filled under pressure with an aluminum alloy.
Thanks to this device, there are no separate elements or gaskets in the monolithic radiator, which means there is no room for leaks.
At the same time, the heating device has a high thermal output, has a low thermal inertia and can withstand, in truth, extreme loads. In particular, monolithic bimetallic radiators can withstand pressing pressure up to 150 atm and heating of the coolant up to 135 C.
The height of monolithic bimetallic radiators can also be different, and their thermal power depends on the geometric dimensions of the heating device and is a constant value.
Advantages and disadvantages of bimetallic heating radiators
Bimetallic radiators are characterized by high heat transfer. On average, one section has a power of 170-190 W (more accurate specifications are indicated in the device passport)
Bimetal radiators can be installed in any heating system (autonomous, central, with plastic or steel pipes)
Heating devices can have any geometric dimensions, which allows them to be matched to any interior design and installed even in a limited space
Bimetal radiators are durable. Monolithic heating devices are designed for a service life of at least 25 years
Bimetal radiators have low thermal inertia, which allows them to be used in controlled heating systems.
The only drawback of bimetallic monolithic heating radiators is their relatively high cost, as well as the fact that it is not possible to change the radiator power or reduce its size.
This article is an instruction for the selection and installation of bimetallic radiators in a city apartment. We will also touch on the general features of bimetallic batteries, and the basics of calculating the required thermal power.
Let's start, however, with an acquaintance with this heating device.
What it is
Strictly speaking, any design that combines two different metals has the right to bear the proud title of a bimetallic radiator. Radiators with a copper core and aluminum fins, respectively, should also be on the list.
In practice, however, we are not dealing with precise definitions, but with the established terminology, within which a very specific heating device is called bimetallic - having a steel core and aluminum fins on the outside.
Why were these metals chosen?
Because at the lowest cost per unit mass, they combine two valuable qualities:
- Steel provides maximum tensile strength.
- Aluminum, in turn, has excellent thermal conductivity and provides uniform heating of the entire surface of the radiator in contact with air.
However: the manufacturing technology itself is relatively complex and somewhat increases the cost. The price of one section can reach 700 rubles, depending on the manufacturer and the margin of the distribution network.
Why Bimetal
The market is full of alternatives. In fact, why do you need to spend money on bimetallic radiators?
Let's start with positioning the solution. It is intended for central heating systems. Owners of private houses in full control of the parameters heating system, can close this page and safely buy an aluminum radiator or a copper-aluminum convector.
How does central heating differ in terms of operational loads?
- More constant pressure in the system. On average - 6 kgf / cm2 versus 1.5 in closed systems of private houses.
- Possibility of water hammer. Water is practically incompressible, and the rapid filling of the entire available volume in the heating system ends with a significant pressure jump.
It is necessary to quickly open the house valve in the elevator unit when starting the heating, as the weak points of the heating system will be revealed in the most unpleasant way for the residents.
- Finally, you can never know for sure which pipes other residents used in their area of \u200b\u200bconnections to radiators.
If copper is used in one of the neighboring apartments, they form a so-called electrochemical pair with aluminum. The emergence of a constant flow of ions from aluminum to copper cells greatly accelerates the destruction of aluminum batteries.
In addition, various horror stories are periodically mentioned about the oxidation of aluminum by air dissolved in water, and about accelerated erosion by slag particles.
But water hammer is an absolutely real phenomenon.
One way or another, a bimetallic radiator:
- Designed for pressure up to 35 atmospheres against 16 for aluminum structures.
Attention: it is better to check the exact value with the seller. Product options may vary.
However, normally in the heating system apartment buildings there is never more than 7 atmospheres, and even when testing the tracks with pressure (with the houses turned off), no more than 12 kgf / cm2 is injected into them.
- More resistant chemically: steel does not form electrochemical pairs with any metal used in heating systems.
Is the steel core afraid of anything? Undoubtedly. Combinations of humidity and the presence of oxygen. Corrosion-resistant steels are used in the production: stainless steel would drive up the cost of the product to heaven.
The good news is that if the heating system is filled with water in the summer, as prescribed by housing standards, corrosion will not get close to the radiators. The bad news is that for a number of reasons, in practice, heating systems are reset in the summer, and the batteries begin to rust rapidly. Wherein: - The strength of the core is reduced;
- The clearance of the tubes inside the radiator decreases, and, therefore, its heat transfer. The amount of coolant passing through the heater becomes smaller.
Fortunately, the process is quite lengthy: even in the worst case scenario, the consequences will become noticeable in 20 years.
Choice
How to choose a bimetallic heating radiator?
Which manufacturer is better can be discussed ad infinitum. Let's put it this way: the number of marriages for everyone is extremely small and for the most part is detected during an external examination. It is enough to carefully examine the correct geometry of the fins and the condition of the threads.
For the buyer, only two characteristics are important:
- Interaxal distance of the eyeliner.
- Number of sections.
It is to them that we will pay attention.
Section height
Most manufacturers offer radiators in fairly large ranges - from 250 to 500 millimeters of center distance between the eyeliners. What to choose?
Let's use the main tool inherited from our ancestors. No, not hands. And not a club.
Common sense.
- If you want to install a bimetallic radiator instead of a cast iron clogged with dirt, minimal cost time and effort - it is easiest for you to opt for heater with the same center distance. 500 millimeters.
- If you need compact batteries and are willing to spend the time and money to adapt the eyeliner - sections with a height of 250 and 300 millimeters are waiting for you.
However: remember that to obtain the same heat output, such sections will require a third more. However, we will touch on this issue a little further.
Number of sections
How to choose heating radiators - bimetallic or any other - by the number of sections?
The easiest way to do this is based on the area of \u200b\u200bthe room; however, we will go the more difficult way.
- For effective heating of a cubic meter of room volume, 40 watts of heat is needed.
- The window adds about 100 watts to the calculation. Door to the street - 200.
- For corner rooms a coefficient of 1.2 is taken.
- For regions of the Far North, the coefficient is even higher - 1.5 - 2.0, depending on the climate.
- The thermal power of one section with a center distance of 500 millimeters can be taken equal to 200 watts, with 350 millimeters between the axes of the eyeliners, it will decrease by a quarter.
Let's do a simple one: a 4x5 meter stalinka room with three-meter ceilings is located in the corner of the house. Two windows face different directions.
Region... Let there be the city of Komsomolsk-on-Amur of the Khabarovsk Territory.
The average January temperature is -28C, the minimum is 45C.
- The cubic capacity of the room will be 4x5x3 = 60m3.
- The basic thermal power will be 60x40=2400 watts.
- Two windows will add another 200. 2400+200=2600.
- The room is corner. 2600x1.2=3120.
- Regional coefficient… Well, not Oymyakon with its minimum of -82, but fresh, fresh. Let it be 1.7. 3120x1.7=5304.
Since we are too lazy to remake good-quality wiring from galvanized pipes, which is in excellent condition even after half a century, we will take radiators with the same center distance - 500 millimeters. 200 watts per section. 5304/200=26.52. 27 sections, which will be distributed over two window openings.
Mounting order
Radiators purchased. How to install them yourself?
Let's stay within the framework of our example: we dismantle the old cast iron radiators and install new ones instead. The plugs at the ends of the radiators have a smaller diameter compared to cast iron ones (threads - an inch versus 1 1/4); however, the diameter of the thread inside the plug is the same 3/4 that was used to connect to the old radiators.
No special problems are foreseen.
- We block the paired risers and unscrew the plugs on both.
- We slightly open the flushing valves on the old radiators and let the risers merge. Residual water can drain for 10-20 minutes. Somewhere the water will definitely hang and pour out under your feet later, so it’s better to have a basin and a rag ready.
- Armed with a gas wrench No. 1, we give lock nuts on both radiators and remove the winding with minium from under them.
- Using the key No. 3 or No. 4, we unscrew the radiator plugs from the radiator. Do not be afraid to make an effort: even if you are very strong, and the stuck cork bursts, we will no longer need it.
Important: if the radiator is mobile during disassembly, substitute any object under it. Breaking off the eyeliner is definitely not in our interests.
- The radiators were disconnected from the supply lines, the rest of the water from the risers merged - partly into the basement, partly under our feet. Now we remove the radiators from the mounts. Most likely, for this you will have to unscrew the two nuts on each of them between the sections.
- We drive old plugs and locknuts from the eyeliners. We screw on new, perfectly even and shiny, locknuts with plugs and put the radiators on the mounts. Of course, nothing prevents you from cutting off the old brackets and mounting new, more aesthetic ones: everything is in your hands.
- With moderate effort, first tighten the plugs, and then the locknuts, wrapping them with linen and paint. A little paint is applied to the carving; then a strand of winding is wound along the thread and a little more paint on top. When you tighten the locknuts, the flax will soak evenly.
Actually, everything. You can run the risers and bleed the air on the top floor.
Conclusion
Normally, Additional information you will find about the properties in the video at the end of the article. Warm winters!
An important component of creating a heating system is. The speed and quality of heating the area depends on their productivity and efficiency. Unlike Soviet times, when there was no analogue, in modern times We offer a wide range of different radiators. One of functional options bimetallic heating radiators are considered. Which is better to choose depends on the specific firms and the characteristics of the material.
This type of radiator perfectly copes with heating the home and is a stylish addition to the interior.
Read in the article
Design features
Bimetallic models fully comply with all the standards and restrictions that accompany installation in an apartment. In appearance, bimetallic products are similar to aluminum, but their internal content is different.
What is better to choose bimetallic heating radiators will be prompted by studying the design of products. The bimetal element is distinguished by stainless steel parts that protect aluminum from dangerous components in the water. Thanks to these details, the body of the equipment does not come into contact with. Steel is characterized by resistance to the influence of an acid or alkaline environment, which are in the schemes of the central one.
In addition to "Global" in our market there is another Italian manufacturer Sira, which offers three product variants, mostly semi-bimetal. At the same time, the devices are known for excellent. To maintain the desired temperature, fewer sections will be required than other companies of similar products.
Among domestic manufacturers, it is worth highlighting the Rifar company. Semi-bimetallic products of this company are characterized by reliability and long service life. Models with special anti-corrosion coating Rifar-zin, which makes aluminum so durable.
In the table you can see the significant characteristics of the radiators of several well-known firms on the example of models with a center distance of 500 mm.
Italian products are focused on durability and reliability of products, even at the expense of thermal power.
Helpful information! Rifar offers a model that operates at a pressure of 100 bar. This is possible thanks to monolithic installation where there are no threaded parts.
Pros and cons of heaters
The structure of bimetallic products makes it possible to improve the quality indicators of this type of equipment. The steel rod inside the device is characterized by a long operational life and exceptional resistance to corrosion. The shell is made of aluminum, which ensures fast transfer of thermal energy.
Similar products have the following parameters:
- Long service life. The steel elements inside the case are resistant to corrosion and damage, so the service life of the device can reach 20 years;
- strength. The body can withstand significant pressure and is not afraid of water hammer;
- a variety of types of products, a stylish look and combination with any;
- excellent heat transfer rate, small inertia and corrosion resistance;
- compactness, ease of installation and light weight;
- economy. Water supply mechanisms create an optimal combination of thermal inertia and energy costs.
The disadvantages of such structures include a significant cost and a small indicator of throughput.
Which heating radiator is better: aluminum or bimetallic version
When deciding which heating radiators are better than aluminum or bimetallic, you should carefully study the features and characteristics of these options.
Aluminum models are made from molten aluminum that is poured into molds. In this case, the radiator becomes completely sealed, which protects against leaks. Aluminum has more than bimetal or cast iron. In addition, the material has excellent corrosion resistance.
The disadvantages of the models include the fragility of the material, the product can be easily damaged. Also, such devices are designed for low pressure in the pipes. The main advantage of a bimetallic radiator compared to an aluminum counterpart is its high resistance to high pressure. Similar designs can be installed as in .
Helpful information! The aluminum device is designed for a pressure of 16 bar, but in apartment buildings, even in season, the installation pressure does not exceed 15 bar. But in private households, you should be careful, as pressure is often pumped up by additional devices.
Rules for calculating sections of bimetallic radiators
Before approaching the connection of bimetallic heating radiators, calculations should be made. One section of such a device is designed to warm up two square meters premises. To choose the right number of sections, the calculation is carried out:
- produced premises;
- the result obtained is multiplied by 100 watts. If the ceiling area is larger than the standard value, then a correction factor is applied, which is equal to 1.1;
- the number that turned out is divided by the heat transfer value of one section.
Owners of private housing should be especially careful to carry out the calculation. In this case, the thermal conductivity of elements such as windows, roofs, walls and floors must be taken into account.
Calculator for calculating sections of a heating radiator
When choosing radiators, they usually focus on two main criteria - the heat transfer rate and what is the maximum pressure for them. These two parameters should be taken into account.
The radiator housing has a figuratively ribbed structure, which is made of aluminum alloy. For the heating circuit, copper or steel pipes. The average bimetallic radiator can withstand pressure up to 40 atm, but there are models in which this figure reaches 100 atm, despite the fact that the coolant has a temperature of 130 degrees. Aluminum made it possible to lighten the mass of the device, while not losing the quality of heat transfer.
Bimetallic radiators can be sectional or solid. Each species has its defenders and opponents. Some believe that the presence of sections increases the risk of a breakthrough at the joints. In addition, the quality of the coolant can also damage the battery from the inside. Therefore, focusing on such "shortcomings", a monolithic model was developed. It has a greasy or copper collector, which is closed with an aluminum "shirt". The integrity of the design significantly reduces the risk of a breakthrough. But even one such device has its own initial power, while sections can be independently removed or added.
Some models have vertical installation so there is no need to use brackets for installation. So special trouble does not occur with installation.
Is the purchase worth the money?
On average, one section of bimetallic batteries costs from 400 to 900 rubles. To some, such a price may seem high, and someone will be surprised at the cheapness. However, it would not hurt to know what you have to give money for.
Such devices have their advantages over other types of heating elements:
- Aesthetics. The panel type of radiators looks so neat and attractive that they fit perfectly into any interior, whether it is a residential building, apartment or office. Compact dimensions allow you to occupy a minimum of usable space. You can choose almost any color or paint the sections yourself, the main thing is to choose the right paint. In addition to the fact that the absence of sharp corners gives a more attractive appearance, this is what makes such batteries safe. Therefore, they can also be installed in children's rooms, because even their surface does not heat up to high temperatures, which means that children will not burn themselves.
- Long operation. Manufacturers claim that their products can last 25-30 years. In order for this statement to justify itself, it is worth saying that this period depends on the operating conditions. And if in a private house the moments of pressure drops can still be controlled, then in an apartment building this is practically not realistic. It is also important to take care of the products from the inside, for which they need to be removed. But again, in the house this issue is solved more easily.
- Versatility. Bimetallic batteries can work with any type of heating systems. Unfortunately, in modern central systems, about good quality coolant is not necessary to speak. And this has a destructive effect from the inside, which significantly reduces the service life. Nevertheless, the bimetal is highly resistant to chemical impurities in the coolant and corrosion. This material is able to withstand pressure of 35-37 atmospheres.
- High rate of heat transfer. This plus is one of the most important in the list of all the advantages of this type of battery. If a thermostat is installed on the device, then it becomes possible to control the temperature. Also, such an installation allows you to save the coolant (which is especially appreciated in private homes), as it allows you to almost instantly adjust the mode due to the small cross section of the channels in the batteries.
- Ease of repair. If you install a sectional battery, then if any element breaks down, it is disconnected by means of nipples. After spending everything necessary manipulations, the old or new section is put back in place.
- Easy calculation. There is a formula (to be given below) that helps to calculate the number of sections for a certain cubic capacity of the room. This allows you not to overpay for excess material. And if at the very beginning there is not enough money for a full-fledged purchase, then you can buy fewer sections, and then add a radiator.
- Ease of improvement. And here we mean not only the ability to add or remove extra sections. Such batteries can also be painted. The main thing is to choose a paint that does not produce chemical substances during heating. Otherwise, the coating can not only quickly lose its attractive appearance, but also significantly harm the health of the household.
The list of advantages of bimetallic radiators is quite wide.
But for the sake of justice, it is worth saying a few words about weak points these appliances:
- despite the fact that manufacturers indicate that the quality of the coolant does not play a special role, in fact, bad water significantly reduces battery life;
- since two alloys (aluminum and steel) are used to create devices, they have a different coefficient of expansion - after a few years, a creak occurs and the strength of the joints decreases;
- low quality of the coolant leads to rapid clogging of steel pipes, corrosion, and a decrease in heat transfer;
- price - the cost of bimetal is higher than cast iron, aluminum or steel.
But, if we compare the number of positive and negative points, it becomes clear that the former really win. But everyone decides for himself.
Quantity calculation
Regardless of where the radiator will be installed, in a house, apartment or office, there is a formula that helps to calculate the number of batteries for a room.
Initially, you need to calculate the area of \u200b\u200beach room where the battery will be installed. To do this, the length, width and height are multiplied together. You also need to know the power of the device. But this indicator is always indicated on the packages. To determine the number of sections, the formula is used - the area of \u200b\u200bthe room X 100 and divided by the radiator power. For example, 20 sq.m. X 100 and divide by 180 watts. The result is the number 11.11. It can be rounded up or down. Experts recommend making a stock and then as a result you will need 12 sections. BUT! As practice shows, devices in more than 10 sections do not heat efficiently. Therefore, it is better to install two batteries, but 5 sections each.
How to choose a radiator?
The original purpose of the battery is to provide heat that will warm the room. At first glance, it may seem that choosing a radiator is quite simple. But if you walk around the house, where there are already old-type batteries, you can notice that they are somewhat different from each other. Starting with the number of sections and ending with the location.
In order for a thermal device to fully fulfill its purpose, it is necessary to choose the right thermal power. To do this, remember the following nuances:
- Section size. If we compare several radiators different manufacturers, you can see that the sections may differ slightly in size. Of course, "small" batteries are compact and cheaper, but their heating efficiency is slightly higher. Therefore, it is worth choosing models with an interaxal gap of 0.5 m, a width of 8 cm and a depth of 9.5 (not lower than 8 cm). By the way, the last two parameters may differ for each manufacturer, in particular, decrease.
- Section weight. The design provides air channels for the passage of heated air. Ideally, there should be at least 4 of them. But it is impossible to visually calculate their number, and this is despite the fact that few buyers generally pay attention to this moment. The greater the weight of the section, the more channels in it, which means that the higher the thermal power will be. One bimetallic element must weigh at least 1700 g.
These two criteria help you choose batteries with maximum efficiency.
There are a number of other tips to help you the right purchase:
- the seller must be required to provide all certificates and guarantors of quality, as well as to compare passport indicators with those indicated on the price tag;
- the seller needs to be interested in the thermal power of the model they like and the weight of the section, which are then rechecked with technical passport- if the seller lied, then there is a possibility that the store does not have a quality product, which means that there is a high risk of buying a fake (or the person is not competent in his field);
- the minimum thermal power of a bimetallic radiator should be 170 W, otherwise you will need to buy additional sections;
- it is important to clarify the service life for each element, and not just for the radiator - it is best to go to the manufacturer's website and study the information there before going to the store.
The place of purchase must be verified. Of course, everyone wants to save money, but this savings can affect the quality of the product. And then it will be difficult without a check and a warranty salon to make claims to anyone.
Overview of popular manufacturers
The modern market for heating equipment is full of various firms. Some are more expensive, while others are cheaper. Little-known manufacturers always have difficulty selling, because there are few reviews of their products, which leads to low level confidence from buyers. But as practice shows, not always a little-known company offers bad things.
However, there are a number of manufacturers that are in active demand among consumers:
- Italy. Some of the most popular firms are Sira, Global Style and Radena. Such devices are distinguished by high-quality and neat finish, aesthetic appearance, low weight and dimensions. Manufacturers give a guarantee of up to 20 years. The section power indicator goes from 120 to 185 watts. Maximum temperature coolant - 110 degrees. The indicator of working pressure is 35 atmospheres. Radena radiators are different increased strength, where each section is interconnected by paronite gaskets and steel nipples. Carbon steel is used for the inner frame. The cost of one section of such firms varies from 700 to 1500 rubles.
- Russia. Initially, domestic manufacturers were famous for not very high-quality bimetallic radiators. But over time, they improved their abilities, thanks to which Rifar batteries appeared on the market. The main model range is represented by Base 200 (350) (500), Base Ventil 200 (350) (500), Monolit 350 (500) and Monolit Ventil 350 (500). Thermal power indicator - from 100 to 200 W, working pressure - up to 20 bar. The maximum temperature indicator of the coolant is 135 degrees. This company has a line of MONOLIT. Here the devices have more powerful features: working pressure - up to 150 bar, thermal power - 134-196 W, maximum coolant temperature - 135 degrees. Unlike the previous version, here the price per section is in the range of 500-900 rubles.
- Forza. This option has proven itself in central systems. It takes into account all the unfavorable service conditions for radiators in domestic apartment buildings. There are models where the center distance is 200 and 350mm. Such radiators easily work in conditions with height differences at installation points. There is also a closed back wall so that the devices can be used with French windows. But there is a requirement here - only water that meets the rules can be used as a coolant. technical operation. According to the manufacturer, Forza radiators can last 25 years. average cost one section - from 700 rubles.
- MARS. This is a representative of a South Korean company. There is a copper core at the base. Maximum rate coolant - 130 degrees, heat transfer - 167 W, operating pressure - up to 20 bar. Despite the fact that this is an imported manufacturer, these models are adapted to the specific operating conditions in domestic heating systems. The price of one section is 400 rubles.
- REGULUS-system. This is Japan. There is also a copper core. The operating pressure indicator is 15 bar, the maximum heating of the coolant is allowed up to 110 degrees. The manufacturer gives a guarantee of 25 years. The average price per section is 1000 rubles.
- Global. Italian firm, which has been on the market for several years now. Style 350 (500), Style Plus 350 (500), Style Extra 350 (500) are the most popular models. These are ready-made radiators, where there is an even number of sections - from 4 to 14. Products are produced in white. The company gives a guarantee of 10 to 20 years, depending on the model you like. The maximum temperature of the coolant is 110 degrees, the working pressure is 35 bar. The average price of one section is 800 rubles.
There are many companies on the market, and each has its own technical characteristics. To make the right purchase, it would not hurt to first ask about the future "working conditions" for the battery. Indeed, if the system does not have a high-quality coolant or there are constant pressure drops, then it is better to buy a more expensive product. Yes, for this you will have to spend money, but then you will not need to think about repairing the battery or replacing it.