Whatever excellent thermal insulation performance the profile would have, the main heat loss occurs through the double-glazed window, so special attention should be paid to its choice.

Energy-saving windows, what is it?

A feature of windows with an energy saving function is the ability to reflect heat waves emanating from heated objects back into the room, significantly reducing the percentage of heat loss. This effect is achieved due to the presence of glass with a low-emission coating in the composition of the double-glazed window. Today, there are two types of such coatings - hard (k-glass) and soft (i-glass). The latter is more popular due to its higher energy saving characteristics. In the production of k-glass, tin oxides are used, and i-glass is made by applying silver oxides. Since i-glass can be quickly destroyed by mechanical or atmospheric influences, it is placed directly into the double-glazed window.

The effectiveness of energy-saving windows is evidenced by the fact that a double-glazed window with i-glass, even with one chamber, has a higher coefficient of resistance to heat transfer than a conventional double-glazed window, and the cost of such a window will be lower.

The main advantages of energy-saving windows are:

• high rate of thermal insulation due to the reflection of thermal radiation back into the room;
• significant savings on space heating;
• an obstacle to the fading of things;
• lower leaf weight with single-chamber energy-saving double-glazed windows and, at the same time, better thermal insulation compared to conventional double-glazed windows.

What are energy efficient windows made of?

1. Energy-saving double-glazed window

A double-glazed window is a key part of an energy efficient window. Heat-saving double-glazed windows incorporate glass with a low-emissivity coating (i-glass) which is coated with a layer of silver ions that reflect heat back into the room. The presence of such double-glazed windows in combination with good profile and accessories allows you to make the house as warm as possible.

2. Profiles of various types

As a profile for the production of heat-saving windows, the profile of the German companies Rehau and KBE, which have gained popularity all over the world, is most often used. Energy-saving Rehau and KBE windows will have high thermal insulation and reliability. For those who prefer products domestic manufacturer and seeks to find the optimal combination of cost and quality, you should pay attention to the Novotex profile. For connoisseurs of natural materials, windows made of pine, larch or oak wood are suitable, which have high strength and can last for a long time. For the production of structures large sizes a warm aluminum profile with thermal inserts from Alutech and NewTec is used.

3. Fittings

Reliable fittings will allow you to maintain good tightness of the window and will not allow cold air to penetrate into the room, reduces the cost of heating the entire house. Fittings from German manufacturers Roto or Siegenia Aubi have proven themselves well, which are distinguished by increased reliability and are designed for more than 40,000 window opening cycles.

Technical characteristics of double-glazed windows with energy-saving i-glass

single chamber	Single chamber energy saving	Double chamber	Double chamber energy saving
Double glazing formula
4-16-4		4-10-4-10-4	4-10-4-10-4і
Insulating glass thickness
24		32	32
Heat transfer resistance, m2°С/W
0,32		0,49	0,61
Soundproofing, dB
24	24	37	37
Sash weight, kg/m2
20	20	30	30

How to decorate heat-saving windows?

For this, various decorative elements, and through lamination, plastic windows can acquire any color required by the customer or be made “under the tree”.

stained glass	Profile lamination	Glass window tinting	Window layouts

Decorative layout or spross can be attached both inside the double-glazed window and be outside. Sprosses can be divided big window visually into several parts. Tinting not only helps to give the double-glazed window, and therefore the window, unusual view, but also to protect both from curious glances and from bright sun rays. Double-glazed windows with stained-glass windows will be beautiful and unusual. You can order an expensive type of stained-glass window - classic or Tiffany, or you can order a decorative film with a pattern glued inside the double-glazed window - it all depends on the financial capabilities and desire of the customer.

4 reasons to buy energy-saving windows from REHAUpartner

REHAUpartner offers a wide range of products for glazing any objects at an affordable cost. All products are manufactured in automated production, which ensures high quality products and completely eliminates the "human factor".

Are double-glazed windows with argon beneficial? Is it worth it to pay for modern technologies? What are the advantages of Rehau energy-saving windows? Are they worth their money? There are many offers on the market for installing energy-saving windows, but can everyone be trusted? How to distinguish a fake? These and many other questions are of concern to a modern person who has started a major overhaul at his "eye" at home. Let's try to see to what extent replacing a window with a high-tech package will help save energy, heat and money, and to what extent this is just a myth.

old and new

Until recently, it seemed that metal-plastics are the best, technologically advanced, effective windows. They did not stay in the first place for long: less than five years later, new, energy-saving plastic structures began to force them out of the market. Manufacturers pay attention, let in more light, retain heat better, which means that only them need to be installed, and the old time has come to urgently change. Of course, replacing windows is a good idea, but it is not cheap, so a reasonable person will think twice whether such a waste of money is justified.

The main idea of ​​the novelty among window technologies is the effective prevention of heat loss through the window opening. As studies show, on average, through this area in environment Almost half of all the heat lost by the dwelling is wasted. As manufacturers assure, and this is also indicated in some reviews, energy-saving windows are one-third more efficient than metal-plastic - which means they are incomparably better than old wooden structures.

We lose heat: how?

Why do they work? What is the logic of such a construction? Manufacturers pay attention: when installing a modern system, special attention must be paid to the glazing area, since the frame is no more than a fifth of the entire window area. Energy-saving glasses are effective due to the type of glazing used, the number of glasses used in the manufacturing process of the glass structure and the distance that separates them from each other. In addition, the efficiency of heat preservation is determined by the material from which the frame is made, and the gaseous medium that fills the space between the panes.

Modern double-glazed windows - ordinary two-chamber windows - with high tightness cannot be considered sufficiently efficient in terms of energy conservation. This is due to the use of ordinary glasses in their design, which conduct heat well. In order for double-chamber windows to store energy indoors, it is necessary to use specific insulators. It is possible to determine a window with low thermal conductivity in the cold season - it cools down from the inside, and when humidity rises, condensation quickly forms. All this points to the low efficiency of the system.

What's the difference?

What are energy saving windows? Many ordinary people, when buying ordinary metal-plastic structures, heard from sellers and managers that these are real windows assembled using this technology. In the process of operation, many were disappointed. When installing a conventional PVC construction, the tightness will be at its best, but this greatly disrupts the normal air exchange, which negatively affects humidity, condensation occurs and falls, which is immediately visible on the cold glass of the window.

What are energy saving windows? These are structures that inner surface does not cool even in severe frost. So, if the outside temperature drops to -26, and inside the room is warmed up to the standard 20 degrees Celsius, the window surface maintains the temperature at 13 degrees. Of course, if the room is very high humidity, even this will not save you from condensate, and yet its amount will be much lower than when installing PVC windows. A reliable manufacturer will definitely tell you that these are energy-saving windows, and also explain how the design works. It must be remembered that efficiency is maintained only if integrity is maintained.

Features of different options

How to check if the manufacturer offers energy-saving windows or ordinary ones? You need to carefully study the specification for the proposed product. For example, if this regular window, then the frame is made of aluminum. In fact, it is a bridge of cold. But the effective window construction is made of composite polymer materials. An alternative option is plastic-wrapped steel. Thanks to this addition, the thermal conductivity of the metal is greatly reduced, and the efficiency of the structure as a whole is increased.

Which ones on the market are better, which ones are worse than energy-saving windows? How to determine? The best option is two-chamber designs - they are always warmer than one chamber. If the package consists of two glasses, this will be one camera. Some designs include as many as three chambers - these are the warmest of all. Considering that these are energy-saving windows, you need to pay attention to the fact that inside they are filled with inert gases that do not conduct heat.

Geometric parameters

In the general case, a single-chamber design consists of two glasses, the distance between which varies from 6 to 16 millimeters. If the system consists of two chambers, the glasses are placed at a distance of 6-12 millimeters from each other. The specific value is determined by what kind of energy-saving windows are installed, what type of profile is used in the design.

It's believed that the best option- this is the distance of the glasses from each other by 14-16 millimeters. Both increasing the distance and decreasing it leads to a deterioration in the heat retention performance.

Save energy: how does it work?

Another will rightly think: only a couple of years ago he changed the windows, and then they offer another novelty. Spending money on constant new clothes is stupid, and it's not cheap. Why not buy a simple one for windows, stick it on and live in peace? The option, by the way, has the right to exist, although it cannot be recognized as the most optimal. However, before deciding to save money, it is worth considering what features of thermal physics are used in the design of new types of windows - perhaps potential buyer he will understand that he really does not need it, or vice versa - he will decide that the investment is worth the money requested for it.

It is worth remembering that the classical methods of insulating floors, walls, are not applicable in the design window openings designed to let natural light into the house. The newest technologies for designing window structures are developments that allow, with a decrease in heat loss, to increase the percentage of light transmitted by the glass.

Heat energy: general course

There are two options for the distribution of thermal energy - rays and convection. In the first variant, the source is considered as an emitter in the infrared spectrum. The radiation intensity is directly determined by the level of surface heating. Convection is direct heat transfer when the air warms up or cools down.

Ordinary glass is not an obstacle to heat rays, that is, the infrared spectrum. That is why energy-saving films for windows can really bring some benefit - they do not allow this radiation to leave the walls of the dwelling so easily. Under production conditions, glasses installed in energy-efficient double-glazed windows are coated with special components - non-ferrous metal sulfides, silver sputtering. You can also use special films - they are also applied in industrial conditions. At high-quality processing surfaces, the ability to reflect infrared radiation increases by an average of 80%, which means that heat loss is significantly reduced. The use of current technologies allows not to harm the ability of glass to transmit light - up to 72% of the sun's rays easily pass through the barrier, and 28% of the difference does not play a role in the level of illumination perceived by a person. If in winter such a window will retain heat, then in summer its use is no less relevant - it effectively reflects the radiation emitted by the sun.

Spray features

No matter how many cameras there are in the window system, spraying is done on only one glass and only on one side. In order to have a longer service life, the treated side is usually located inside the first chamber, on the street side. There are several varieties of layers used to save energy.

One of the most common options is k-coating. It is considered solid, as it has increased strength, resistance to mechanical damage. Created using metal oxides. For application, the surface is first heated to a very high temperature, so the least resource-intensive spraying process is during the manufacture of an insulating glass unit.

An alternative option is an i-cover of two layers. It is more destroyed under the influence of aggressive mechanical factors, therefore it is classified as soft. First, a silver layer is deposited, for which the glass must be fully prepared and placed in a vacuum. The second layer - protective - consists of titanium oxide.

What's better?

Some experts point out that both of the described technologies have been used for a long time and cannot be attributed to the most effective and reasonable options. AT European states in the last few years, selective methodologies have been actively used, in comparison with the described ones, showing the best parameters by about three times. At the same time, new items are more economical for the buyer. Thus, the Swiss company Euroglass proposed the Zero option, which, with a difference in cost per square meter of glass, is only ten dollars more expensive, but retains heat two and a half times better. However, at present it is not clear when the most advanced technologies will reach our country. Perhaps in the near future: we will see.

What threatens?

It is believed that the main advantage of k-technology is that the coating endures possible mechanical damage. At the same time, practice shows that in most cases these are typical only production process. When a double-glazed window is assembled, the coating is inside, in a protected sealed chamber, where nothing threatens it, so there is no real difference for the user - unless, of course, the manufacturer of reliable and energy-protective glass is carefully manufactured.

At the same time, surveys have shown that many do not see the difference between these two technologies. There is an emission, but it is too small to be felt without using high-precision measuring instruments. If we take the base temperature outside at 26 degrees below zero, while at the same time heating up to 20 degrees of heat is maintained in the living room, k-glass will cool down to 11 degrees, and i-technology will show a level of 14 degrees. The real benefit and difference in the presence of condensate is usually not noticeable, so you can safely choose any of the options.

Is it worth doing?

As can be seen from the experience of numerous users, installing an energy-saving window helps to significantly reduce the amount of condensate released, it is easier to maintain air humidity at a comfortable level. The microclimate in the living room is significantly improved, especially in comparison with the classic metal-plastic structures. When using an energy-saving window, the edge zone does not freeze, and ice does not form. If the user is currently experiencing such window system problems, it is worth seriously considering replacing the design with a more advanced one.

Inert gas: effect or beautiful words?

Typically, windows are filled from the inside with krypton or argon. In general, it is believed that such a gas helps to reduce heat loss through the panes. Explaining the logic of this system, it must be remembered that the air inside the living space is warm, it constantly contacts the colder glass surface, transferring the accumulated heat. The lower the surface heating, the faster the heat is released, but when using energy-saving technology, the indicator decreases. When the glass heats up, it gives off heat to the air that fills the chamber space. It transmits energy further - to the outer layer of glazing and to the outside world. The lower the temperature of each layer, the more intense the heat transfer process.

In many ways, the efficiency of heat preservation depends not so much on the filler, but on the distance by which the glass is separated. If it is large enough, then the glasses are far from each other, they can transmit, receive a lot of heat. If the distance is short, then the energy is transferred directly. It is believed that the range of 6-16 millimeters is effective.

And why do we need gas?

If, instead of ordinary air, an inert gas is pumped between the panes, heat will be transferred at a slower rate, since these substances are characterized by low thermal conductivity. In addition, the filler of the double-glazed window will be completely devoid of water molecules that can form condensate. Water is an excellent conductor of heat, and the less it is, the more efficiently energy is stored.

Is it worth overpaying for window packages assembled using this technology? It is believed that argon reduces energy losses by approximately one tenth, which in reality is very difficult for an ordinary person to notice. Most users note that they did not feel any significant difference. On the other hand, it cannot be denied that the use of special gases improves the performance of window systems and, with a high level of heat retention, can provide an additional improvement. But when installing an ordinary plastic window, filling the chambers with argon or krypton does not bring any real benefit - the energy losses are large enough so that a tenth of it does not play any significant role.

And finally...

It has long been considered that one of the leaders in the field of manufacturing energy-saving and simple plastic windows- Rehau company. The price of its products is not the lowest, but many are willing to pay this amount to get a durable design. According to experts, one of best products on the market are the Geneo windows developed by this company. The advantage of the design is the presence of a well-thought-out ventilation system, due to which the humidity is not so high. As can be seen from the reviews, when working with an authorized supplier, there will be no problems with the quality of the system. On average, the price for one window is about 25 thousand. Is it worth spending that kind of money? It is up to each buyer to decide on their own: the amount is quite large, but these designs will also retain heat better than most of the competitors on our market.

Hi all!

I received an e-mail from one of the readers with a question about energy-saving double-glazed windows. They have in kindergarten windows are planned to be replaced, they decide which ones are better to install.

Since in the children's room all year round cool, then parents want to make the conditions more comfortable.

First of all, he was interested in the ratio of price and quality, that is, how much better these windows retain heat and how much higher their price is.

I am writing about all this especially for him and other enterprising parents who want to give their children all the best.

Welcome!

Energy-saving double-glazed windows are the number one choice among consumers today.

They represent certain kind glazing, which perfectly retains heat in the room.

Unlike ordinary double-glazed windows with energy-saving glass, they are made of special glass, over which a certain low-emissivity coating is applied.

This allows you to freely pass solar energy with short waves directly into the interior of the room, and tending to the outside heat flows freely reflect, thus retaining heat.

There are several types of heat-saving windows:

1. Energy-saving double-glazed windows with argon. They contain a special gas that creates a certain pressure inside the system and prevents heat from escaping to the outside.
2. Single-chamber double-glazed windows are energy-saving. Has one camera.
3. Energy efficient double glazing. Represented by two cameras respectively.

Production implies the use of several types of glasses in the process of their creation:

• I-glass with improved energy-saving effect, absolutely transparent;
• K-glass having a metal oxide on its surface has more low degree transparency.

They depend on the type of glass used in the process of their manufacture and the number of chambers. They are determined by the type of double-glazed window and the resistance to heat transfer.

Drawing an analogy with a conventional single-chamber window, we can note:

- that the level of its resistance to heat transfer is - 0.32,

- energy-saving single-chamber - 0.59,

- two-chamber conventional - 0.47,

- two-chamber energy-saving - 0.64.

Thus, we can say that, unlike the usual one, the energy-saving package is 1.5 - 2 times “warmer”.

Before checking an energy-saving double-glazed window, it is necessary to check the presence of such an important indicator as a marking that indicates the type of glass used, the number of chambers and the level of energy saving.

This is a prerequisite for their high level, quality, practicality and durability performance.

Note!

Single-chamber or double-chamber package with energy saving function, save about 38-40% more heat than conventional metal-plastic windows at the same price!

Many manufacturers, unlike us, offer their customers deliberately inflated prices. Our price is the personification of democracy and acceptability for various categories of the population.

Or you can send a request for calculation to our managers and they will call you back and announce the cost of your window.

According to research, such windows pay off in 1 season!!! After that, you get a net savings for the rest of the time.

Energy-saving double-glazed windows purchased from us are distinguished by:

• high quality;
• reliability;
• practicality;
• aesthetics;
• high degree of functionality;
• excellent heat-saving properties;
• good fittings from the world's leading manufacturers.

We will provide you with the highest level of service fast production windows and a long warranty period.

source: okna-region23.ru

That's why modern manufacturers they try their best to make their window as energy efficient as possible.

To do this, the windows use double-glazed windows with energy-saving glass - i-glass.

Energy Saving Features

The characteristic of energy saving is the emissivity of glass.

Emissivity (emission) is understood as the ability of a glass surface to reflect long-wave thermal radiation invisible to the human eye, the wavelength of which is less than 16000 (Nm).

The surface emitter (E) determines the emissivity of glass (for ordinary glass it is > 0.83, and the emissivity of selective glasses is less than 0.04) and, therefore, the ability to “reflect” heat radiation back into the room.

The reason for the appearance of radiation lies in the movement of free electrons of atoms located on the surface of the glass, and the density of moving electrons.

Useful advice!

The surface emissivity (E) of ordinary glass is > 0.83, while the emissivity of selective glasses is less than 0.04

Not all metals that conduct electricity well have the ability to reflect long-wave thermal radiation. Therefore, the lower the emitter, the less heat loss. At the same time, glass with an optical coating having an emitter value of E = 0.004 reflects back into the room more than 90% of the thermal energy leaving through the window.

That is why most window manufacturers in Russia currently use energy-saving double-glazed windows and the share of their use on the market is constantly growing.

Difficulties with transportation and work with i-glasses associated with their design features, have led to the fact that, as a rule, only large, specialized firms are engaged in the production of energy-saving windows in the world.

Energy-saving windows with i-glass are also offered to their customers by Okna-Etalon. By purchasing it, you get the maximum possible efficiency from the money spent!

i-glass is a low-e glass with a multi-layer coating (including silver) deposited by plasma spraying in a vacuum.

This is a "soft" finish.

A sheet with such a coating should only be turned inside the double-glazed window. I-glass is produced by vacuum deposition and is a three-layer (or more) structure of alternating layers of dielectric silver (BiO, AlN, TiO2, etc.).

The application technology requires the use of high-vacuum equipment with a magnetron sputtering system. Low-emission i-glass during the heating period "returns" to the apartment up to 90% of the heat waves emitted by heating devices.

And in the summer it reflects the thermal, infrared (IR) part of the solar radiation. As a result, the room becomes warmer in winter and cooler in summer.

I-glass has improved thermal protection performance. For example, when outdoor temperature-26 degrees and the temperature in the room +20, the temperature on the surface of the window inside the room will be +5 degrees for a conventional double-glazed window, and +14 degrees for an energy-saving one.

Advantages of using double-glazed windows with energy-saving I-glass:

• i-glass reflects long-wave heat rays towards their emitter (that is, in winter towards the apartment where the heating devices work, and in the summer towards the street, where there are stones heated by the sun, asphalt, etc.), which significantly reduces heating costs in winter and air conditioning in summer. In other words, the coating leaves heat where there is more of it.
• The heat-insulating ability is much higher in comparison with a two-chamber double-glazed window. Thus, in any climate zone thermal comfort in the room is achieved by using double-glazed windows with energy-saving glass. The effect is eliminated - "blowing from the window".
• The temperature on the surface of an insulating glass unit is higher than on the surface of ordinary glass, which reduces the likelihood of condensation on the glass.
• i-glass prevents fading of upholstery and interior items. At the same time, the transparency is similar to the transparency of ordinary glass.

Compared to ordinary glass, i-glass can provide truly incredible savings.

On average, a private house has about 4 windows, with a total area of ​​​​about 9 square meters. m. The total savings for the heating season will be: 2070 kW, which is equivalent to 1.5 tons of coal for the heating period and will bring savings of about 6000 rubles in the first heating season.

source: www.okna-etalon.ru

When choosing new windows, the buyer first of all looks at whether they are made of plastic or wood, not taking into account the fact that this plays a small role in energy saving, because. materials framing the translucent structure make up an insignificant part of the window.

But the light openings, which make up the bulk of the area of ​​​​the double-glazed window, account for more than 40% of all heat losses in the building. The use of ENERGY-SAVING GLASS PACKAGE will help to keep heat as much as possible, preventing its exit from the room through the window.

Energy-saving double-glazed windows have a number of advantages not only over single-chamber double-glazed windows made of ordinary glasses, but also over two-chamber double-glazed windows, consisting of 3 of the same glasses. Why are energy-saving double-glazed windows better than triple-pane double-glazed windows?

1. The energy package provides 30% higher resistance to heat transfer - about 0.61 m2K / W;
2. A single-chamber double-glazed window is one third lighter than a widely used double-glazed window, i.e. is one third less material-intensive;
3. Such a double-glazed window is more acceptable for our climate;
4. In energy-saving double-glazed windows, a significant reduction in the load on fasteners and hinges helps to reduce their wear and, as a result, increases the durability of the frame structure;
5. A double-glazed window with energy-saving glass is actually cheaper than a two-chamber one by 20 - 30%;
6. The energy package significantly limits the passage of ultraviolet rays into the room, which prevents furniture and window curtains from fading.

Often, when buying windows, we allow ourselves to save money by choosing cheap, “old”, unimproved and unadapted technologies for our weather conditions.

We gave an example of a technology that is currently the most suitable for the buyer in terms of price and quality.

Our company successfully works with this technology and in its production uses only high-quality glass "ClimaGuard N", "ClimaGuard Solar", "Sun-Guard High Performance" from the world famous company "GUARDIAN" USA, which has its own glass production plants around the world.

One of the concerns of consumers is the question of the definition of glass with an energy-saving coating.

Useful advice!

One of the most popular and available ways checks - bringing fire to the glass, the reflection color of which will change from yellow to red.

The red color of the flame indicates an energy-saving coating. This method is optional but not primary.

most faithful and professional way determination of an energy-saving coating in glass is a special electronic device that determines both the presence of the coating itself and the side on which it is applied, which cannot be done using the above method.

What is ClimaGuard N glass?

1. Heat-saving glass with silver coating;
2. Effectively retains heat indoors in winter;
3. Reduces heat loss;
4. Raises the temperature of the inner glass by 6 degrees (temperature at the center, calculated value);

Produced in Germany, Luxembourg, Russia, Poland, Hungary. Vacuum-magnetron sputtering technology allows you to deposit transparent layers of silver atoms and silicon nitride (to protect silver).

Note!

With the help of silver on glass, we get the same effect indoors as in a thermos - the heat remains inside, and does not escape into the atmosphere. Heat losses during the installation of such glass are reduced by 15 - 20%.

What is ClimaGuard Solar glass?

This is a multifunctional glass that protects against heat in summer and cold in winter. Ultra-thin layers of metals deposited on the glass make it possible to keep it as transparent as possible.

A special coating of silver and other metals creates the effect of a transparent filter that allows visible light to pass through, but significantly reduces the penetration of solar heat into the house in summer and heat leakage in winter.

The silver coating on the ClimaGuard Solar glass reflects long-wave thermal radiation, for example, from heating devices, into the room, preventing it from escaping to the outside.

• ClimaGuard Solar glass provides effective protection from the sun, which helps to significantly reduce the cost of air conditioning (solar factor 42%);
• High coefficient of resistance to heat transfer (0.65 m2K/W) reduces the cost of space heating in the cold season (heat savings - up to 78%);
• Visually transparent glass (no color distortions);
• ClimaGuard Solar glass is preferably used in projects where energy saving, sun protection and good natural lighting are important.

What is Sun-Guard High Performance glass?

Peculiarities:

1. sun protection properties. Multifunctional glass "Sun-Guard HP" Able to filter the sun's rays by wavelength. The bulk of the thermal radiation is reflected (blocking solar (thermal) radiation), and natural light penetrates into the room with virtually no obstacles.
2. thermal insulation properties. Multifunctional glass "Sun-Guard HP" provides high thermal insulation (low coefficient of thermal conductivity) in double-glazed windows, where the second glass is ordinary transparent.
3. Wide range of shades and colors.
4. Benefits for end users. The use of multifunctional glass "Sun-Guard HP" reduces the cost of air conditioning and heating of the building without loss in illumination and color rendering.

Improved thermal insulation increases the glass surface temperature, which reduces cold air circulation and the likelihood of condensation on the interior glass in cold climates, and reduces condensation on the exterior glass of the façade in hot and humid climates.

You can choose any design, but we always remind our customers that when right choice You will not only avoid heat loss and save on heating costs, but also drastically reduce the penetration of annoying noises from the street.

Most importantly, with your choice, ensure the durability of the structure while maintaining all its original properties.

source: www.shklyarus.by

To date, our country has centralized system heat and power supply. This is mainly a heat supply system, in which about 65% is the share of CHP.

The remaining share falls on boilers and autonomous systems heating.

Tariffs for heat and energy carriers tend to constantly increase, and therefore efficient work heating systems and a significant reduction in heat losses is considered as a strategic task.

In this regard, the problem of energy saving has become one of the most urgent for our country. That is why manufacturers of plastic windows solve the issue of keeping the heat in the room by using energy-saving glass.

It should be noted that the heat-shielding and energy-saving functions of the window are of great importance for the end user, because. through windows, depending on the type of house, heat losses from 37% to 56% occur (apartments located at the end of the house).

Areas with a red background are “hot” areas through which heat escapes most intensively:

• walls ~ 30%
• roofing ~ 14%
• gender ~ 12%
• windows ~ 44%

100% of the living space of 4 5-storey buildings accounts for approximately 12-16% of window openings, through which heat loss in modern residential premises averages about 40%.

Useful advice!

Heat loss through old wooden windows is about the same as heat loss through walls. It turns out this is because through the windows there are heat losses through cracks, leaks and during ventilation of the premises.

German experience

So in Germany, in order to reduce heat loss, a massive reconstruction of buildings was carried out, namely walls, facades and replacement of windows.

After conducting an analysis related to calculations to reduce heat loss, the result showed the following:

— heat loss through the walls was reduced by 73%,

– thermal radiation through windows by 62%,

- heat loss during air exchange by 50%.

Similar calculations were carried out in our country for the relative reduction in heat loss:

if we replace the existing wooden windows with plastic ones, then in terms of the average cost of thermal energy from a thermal power plant in central Russia, the savings on an average apartment will be about 3 thousand rubles per heating season. Of course, the figures are approximate, and the tariffs for heat carriers differ even within the same region.

Here are some more examples: in Moscow, during the reconstruction of panel houses, windows are replaced simultaneously with the insulation of facades. The energy saving program in Moscow plans to install windows with energy-saving double-glazed windows.

This is beneficial because it solves the problem of eliminating significant heat losses. At the same time, the appearance of the facades of houses after the reconstruction as a result of unauthorized installation of windows by residents is preserved.

In Chelyabinsk, at the end of 2009, a project was carried out to install individual accounting heat in two multi-apartment panel houses.

The results showed the desire of residents to save money, since this immediately began to affect the bills for heat carriers. The temperature began to be regulated by a thermostat on the battery, and not by a window.

This means that less heat escapes from the windows into the atmosphere.

For residents of private houses and cottages, the following example can be given:

- experts have calculated that the windows of a medium-sized country house, equipped with double-glazed windows with energy-saving glass, save as much heat energy during the heating season as 300 kg of such liquid fuel as fuel oil or diesel fuel.

So what exactly are energy-saving glass and how do they help keep the heat in the house? What is the difference between energy-saving glass and ordinary glass?

To make it clear to an ordinary end user, on the one hand, an invisible coating is applied to the surface of energy-saving glass, which is a kind of filter.

The coating prevents the exit of long-wave thermal radiation (infrared waves) from heating devices and reflects it into the room. Thus, the heat is retained and does not escape to the outside.

Note!

Energy-saving glass has a metal coating thickness of only a few tens of nanometers.

It is no different from ordinary glass and is absolutely transparent to our eyes. Energy-saving glasses are used in the manufacture of double-glazed windows, since their operation requires complete tightness.

For the production of ordinary sheet glass, two methods are used: vertical - by drawing and horizontal - on a metal melt.

When using the horizontal method, the so-called float glass is obtained, which has excellent optical properties and high light transmission. So it is used for the production of energy-saving glasses. A coating of non-ferrous metals (mainly silver) or their oxides is applied to the polished surface of float glass by spraying.

Due to the phenomena of electrical conductivity and interference, such glass acquires the ability to reflect thermal waves in the infrared range and, thereby, reduce heat loss in the room.

Glass with such properties is also called heat-saving, low-emission, and selective.

The first definition speaks for itself.

The second definition is related to physical concept, as surface emissivity or emission. The emission of energy-saving glass is an order of magnitude less than that of ordinary glass, which is why it is called low-emission glass.

The term "selective" means that our glass transmits waves of light and heat ranges selectively and it turns out that in the summer heat the use of energy-saving glass will protect your home from the penetration of infrared sunlight that can quickly heat the air in the room, and in the cold season, on the contrary , from heating devices, heat will be reflected inside the room.

This means that in any weather the house will remain optimal for comfortable living microclimate. In regions with a hot climate, it is recommended to use darkening low-emissivity glasses.

They have an even lower degree of transmission of sunlight, protecting in summer period room from the heat that the sun brings. Such solar control glass can have a different tint color: bronze, gray, green, pink.

Currently, two types of coatings are used for energy-saving glass:

• soft (Double Low-E), the so-called I-glass;
• hard (Low-E) or K-glass.

Hard-coated energy-saving glass (K-glass) is produced by applying a thin layer of oxides of certain metals to the still hot surface of float glass directly during its manufacture.

On its surface chemical reaction At high temperature (pyrolysis method), a thin layer of InSnO2 metal oxides is created, which is transparent, and at the same time has electrical conductivity.

It is known that electrical conductivity is directly related to the emissivity (E) of the surface. Emissivity value plain glass is 0.84, while K-glass is usually about 0.2.

This coating is particularly durable and therefore it is called hard.

K-glass, significantly reducing heat loss, improves the thermal insulation of the room and thereby reduces the cost of heating it. In appearance, it is no different from ordinary glass and has the same high light transmission. K-glass as part of a double-glazed window is turned with a low-emissivity coating towards the room.

It does not allow thermal radiation of the long-wave range from heating devices to pass through the interwindow space.

Note!

Soft-coated energy-saving glass (I-glass) is produced using a more sophisticated technology.

I-glass is a high-quality glass with a low-emissivity coating deposited on one glass surface under vacuum conditions by cathode sputtering in a magnetic field of metal-containing compounds with specified selective properties.

A layer of silver is applied to the float glass, and titanium oxide is applied as a secondary coating. It has the best performance compared to K-glass, in particular, higher light transmission and lower emissivity.

Please note that I-glass has low abrasion resistance (it can be easily scratched).

The use of double-glazed windows, which include I-glass, allows not only to reduce energy costs for heating the room, but also significantly increase its comfort.

However, due to the fact that its energy-saving coating is always located inside the double-glazed window, on performance characteristics this shortcoming is not affected.

So, what is it - energy-saving double-glazed window? First, let's find out what a regular package is.

The product is a system consisting of two or three sheets of glass connected along the contour so that a hermetically closed chamber with a layer of dried air is formed between them.

That is, double-glazed windows can be divided into three types according to their design:

• SPOR - single-chamber with a framing frame (the width of the framing frame shelf should be 15 (± 1) mm and the distance between the glasses can be 6, 8, 9, 10, 12, 15 mm);
• SPO - single-chamber (the distance between the glasses can be 6, 8, 9, 10, 12, 15, 16 mm);
• SPD - two-chamber (the distance between the panes can be 6, 8, 9, 10, 12 mm).

There are double-glazed windows filled with air and noble gases (argon, krypton).

Thus, an energy-saving double-glazed window is a product that includes glass with low emission.

To understand how low-e glass works, it is necessary to understand the meaning of the term emissivity.

Emissivity is a measure of a surface's ability to absorb or lose heat (E). It is customary to evaluate the emission on a scale from "0" to "1" (from 0 to 100%).

A high value on the scale indicates that the surface is a good heat emitter (loses heat quickly). A low value on the scale indicates that the surface is a poor heat emitter (loses heat slowly).

Surface emissivity of ordinary glass = 0.9. Emissivity of glass surface with low-e coating = 0.17. These coefficients show that ordinary glass has a high emissivity of 0.9 and is therefore a poor insulator because it loses heat quickly.

Low-e glass has an emissivity of 0.17, a very low value, it loses heat slowly, so it is a good insulator.

Advantages of energy-saving double-glazed windows

1. Effectively retains heat indoors in winter up to 60% (maximum energy-saving performance)
2. Defence from solar energy summer (reflects up to 34% of solar heat)
3. Reduces the likelihood of condensation on the windows (the temperature rises in the window zone)
4. Reduced heating costs (electricity or gas consumption in winter is reduced by reducing heat loss)
5. Improves the microclimate (which ensures, for example, the optimal development of indoor plants)
6. Cleans the room from germs (due to the transmission of ultraviolet radiation)
7. Visually transparent glass inside (no color distortion)
8. Protects interior details from fading

Comparison of the thermal characteristics of windows with energy-saving glass and ordinary double-glazed windows shows that a single-chamber double-glazed window with energy-saving glass is more efficient than a two-chamber double-glazed window.

Window manufacturers give a comparison at a window temperature of -26 degrees and an indoor air temperature of + 20 degrees:

• Ordinary glass pane. The temperature on the inner glass is + 5 degrees.
• Double-glazed window with K glass. The temperature on the inner glass is + 11 degrees.
• Double-glazed window with I-glass. The temperature on the inner glass is + 14 degrees.

How to determine the presence of energy-saving double-glazed windows?

If you bring a lighter or a candle to the double-glazed window and consider the reflection of the flame.

Then on ordinary glass, both reflections of the flame will be the same - yellow, and on energy-saving glass, one flame will be, like on ordinary glass, yellow, and the second flame will have a pronounced red tint.

Energy saving glass

They are both solid and soft coating, found wide application in many countries.

The technology of their production is quite complex and requires high qualifications from manufacturers. Therefore, there are only a few large companies in the world that produce energy-saving glass in large volumes.

In Russia, until recently, the bulk of high-quality glass was imported. After the completion of the construction of a new Glaverbel production complex in the Klinsky district of the Moscow region, the Russians got the opportunity to use domestic energy-saving glass in the glazing of their homes and offices.

So how come better in winter keep the heat in the house as efficiently as possible? The advantages of double-glazed windows with energy-saving glass are obvious here. And their use, especially in the construction of private houses and cottages, can be very profitable, provided modern systems heating and ventilation.

For the manufacture of energy-efficient windows at ISOLUX, manufacturers can order ClimaGuard ® heat-saving double-glazed windows 4 mm thick with a silver-based protective layer, as well as packages with I-glass 4 and 6 mm. Both those and others are filled with argon.

Advantages of heat-saving double-glazed windows

Durability and reliabilityWindow systems with heat-shielding double-glazed windows are lighter and load the fittings less, prolonging its service life. Low-emission coating is maintained throughout the entire period of operation of the system.

Effective thermal protection in winterThe design insulates heat much better than the standard, although it weighs less. A package with one chamber of two energy-efficient glasses is 1.5 times lighter than a typical one and retains 25% more heat in the room.

Comfortable microclimate in summerIn the summer heat, the bags reflect heat waves to the outside and keep the room pleasantly cool.

The heat in the room is provided by two sources. The first is solar radiation entering the windows from the outside - ultraviolet, visible light and short infrared waves; the second is heated objects and heaters in the room, from which long IR waves emanate. Help prevent heat loss I-glass with low-e coating reflecting infrared radiation into the room. The ion-coated glass is mounted first so that the coating is located inside the glass unit. Silver ions on the surface of the heat-efficient package create a mirror effect. In contact with heat waves from heating devices, they direct the radiation back. As a result, the heating intensity can be reduced by up to 50%.

Energy packagesClimaGuard®Solar multifunctional. They solve two problems: in winter they keep heat in the room and in summer they protect the room from the sun. One layer of their coating reflects heat waves from heated surfaces into the room, the other one retains up to 60% of solar energy. Silver plating does not affect the transparency and optical properties of glass, helps to save on heat supply, and prevents windows from fogging.

Application and prices for heat-saving double-glazed windows

We offer affordable designs High Quality. All of them are certified and meet the requirements of GOST. Thermal packs are popular in glazing:

• cottages,
• city ​​apartments,
• shopping and business centers,
• medical institutions.

The cost of such products depends on the choice of their modification - with I-glass or multifunctional ClimaGuard ® , on the area of ​​glass filling, glass thickness. An energy-saving glass package quickly pays for itself - it saves up to 40% more heat compared to a standard counterpart.

Relatively recently in the construction market finishing materials a thin polymer film appeared, which has the thinnest coating of gold, silver or chromium-nickel alloy, the thickness of which does not exceed a few nanometers and is commonly called a heat-saving film on windows.

Its efficiency in the house is due to a number of factors, given which you can really achieve the effect of heat saving, saving up to 30% of heat consumption in an apartment or on a balcony during the cold season, but you can also get a number of completely undesirable effects that this material has.

How does film work?

The basis for the production of the film is polyethylene terephthalate (PET) polymer, the thickness of which, depending on the manufacturer and operating conditions of the heat-saving film, can vary from 80 to 200 microns. Due to the high plasticity of the heat-saving film, it can, to some extent, increase the strength of window glass, especially when glued directly to its surface. But the biggest advantage is that accidentally broken window glass will not shatter into small pieces. They will remain in the window frame tightly “glued” to the film.

But the protection of window glass, of course, is not the main task of using a heat-saving film.

Due to the microscopic layer of rare-earth metals deposited on its surface by plasma evaporation and subsequent deposition of metal vapor in an argon medium, a layer is formed that, without preventing the penetration of visible spectrum rays through the film, changes the transparency of the film for UV and IR rays due to refraction. Sun. These rays are not visible to the human eye. But IR (infrared) rays are responsible for the transfer of heat, their film, refracting, reflects into the room, it is due to this that its “heat-saving” effect is manifested. But the rays of the UV (ultraviolet) part of the spectrum, which make up a significant segment of the light of the Sun, it reflects, preventing their penetration into the room.

The UV rays of the Sun have a strong ionizing effect. Being vital for the body in small doses, they contribute to the production of vitamins of group D in the human body, normal photosynthesis of indoor plants and the purification of indoor air from pathogens.

When is film appropriate?

Most manufacturers recommend sticking a heat-saving film on the windows of an apartment or balcony only for the cold period - from October to March. It is during this period that protection from heat loss through windows affects. The rays of the Sun, trying to penetrate the windows into the room, practically do not carry heat with them in winter, so the reflection of the UV part of the Sun's light does not cause discomfort, since the films are absolutely transparent and do not give a tinted effect. But the IR (infrared) rays that seek to leave the room, emanating from heating devices, on the contrary, are reflected inside the room. It is in this that the heat-saving properties of the film are manifested. Another important factor in which the heat-saving effect is most fully manifested is the technology of applying a heat-saving film to glass.

There are two types of films: the most common are heat-shrink films that can stretch when heated. warm air from a household hair dryer and film, directly glued to the glass in a "wet" way, using soap solutions.

In the first case, the film pasted on double-sided tape on the window frame also plays the role of a “third glass”. A thin air layer is formed between the window glass and the film, which, like the air between the panes of a double-glazed window, is an excellent protection against heat loss.

Negative film properties

In addition to positive, the film also has negative properties.

The most serious of these is the almost total reflection of the Sun's UV rays. From this negative property of the film most suffer houseplants growing on a windowsill or balcony, which begin to wither and die. Therefore, if you are using winter period heat-saving film on the windows, be sure to organize for plants located on your windowsills, 12 hours of illumination with phyto-lamps that give the correct radiation spectrum necessary for normal plant growth and allow you to make up for the lack of natural light from the Sun. True, in this case, there can be no talk of any “energy saving” in your apartment. Even very economical LED phytolamps, with daily illumination of plants for 12 hours, will completely “absorb” your savings on space heating.

The second negative effect of a heat-saving film applied to the windows of an apartment or a balcony is its complete inefficiency in spring and autumn periods. When the heating in the apartment is not yet turned on, or is already turned off, the film prevents the penetration of the sun's heat from the street. On the balcony and in the apartment, especially in spring, it becomes cold and damp.

Another disadvantage of heat-saving films is their ability to reflect radio waves. The radio signal going to your TV antenna or mobile phone, will be reflected metal coated film, and the signal coming from your mobile device will also be reflected inside the apartment.

Therefore, cellular communication in houses where heat-shielding film is pasted on the windows is usually very poor.

How to mount film

It depends on what kind of film you are using - shrink, self-adhesive or soap-based. In any case, you will need an assistant. The film can be sold both in sheets folded in half and in rolls.

First preparatory stage is washing and drying the window.

After that, a layer of soap solution is applied to it from a household sprayer. To prepare it, you can use a children's uncolored shampoo or colorless dishwashing liquid. After that, a film cut to the size of the glass is applied to the abundantly moistened glass of the window. Be sure to first the upper edge, and with a soft rubber roller or a rubber scraper for cleaning windows, expel excess soap solution from under the film. First, from top to bottom - in the middle of the glass, and then - from the glued middle of the film to the sides. If possible, the formation of large air bubbles should be avoided. In these places the film will not stick. Small wrinkles and liquid bubbles will disappear on their own as the film dries and the film will completely straighten out.

Glue in the same way self-adhesive film. Only the base that protects the adhesive layer is not removed immediately from the entire film, but a narrow strip is peeled off from the upper edge of the film. It is necessary to work together. Having glued the upper edge, the person at the top smoothes the glued film with a soft cloth, and the person at the bottom gradually removes protective layer pulling it towards you. The main thing is not to rush.

Installation of shrink film is also best done by two people. A double-sided adhesive tape is glued along the perimeter of the window frame, a blank 2 cm larger than the glass is cut out of the film, and glued to the adhesive tape around the entire perimeter. First, the top, while the assistant should pull the bottom edge of the film by the corners, preventing premature gluing of the film. The resulting wrinkles and folds are not terrible.

After gluing, the film is blown with hot air from a hair dryer, and it straightens and stretches itself. Shrink film is especially effective on the balcony, where it acts as a second or third glass.

Summing up

If you are going to apply heat-saving film on windows in your apartment, weigh the pros and cons. Perhaps it would be cheaper to insulate a balcony or windows if they are wooden, or a freezing wall or floor? The film is not in a radical way insulation, in addition, it requires annual replacement.