Formula of a double-glazed unit: simple about incomprehensible

Modern PVC window - a complicated design, without training, it's difficult to orientate, which profile to choose, how many cameras and "energies" should be in a double-glazed unit. But the most incomprehensible indicator is the formula of a double-glazed unit. But she just shows what you are buying.


Three key points:

Decoding of the formula of the glass packet
Why exactly with energy saving?
Additional indicators in the formulation of a double-glazed unit
Decoding of the formula of the glass packet
What is the main thing in the window today, except for quality? - Energy saving. Contrary to the widespread myth of exaggeration of the profile's value, energy conservation generally provides a double-glazed unit. And to make sure that you sell exactly an energy efficient window, pay attention to the formula of the double-glazed unit which, in design calculation, should be provided by a consultant of the window company. Understanding the formula will also help with the independent calculation of the energy efficiency of the window Energy Calculators OKNA.ua (point "Glass Packet").

Consider the example of 4i-14Ar-4-14Ar-4i - this is the formula of a two-chamber glass unit with two "energies" and filled with argon, where:
4 is the thickness of glass in millimeters (in all, in a double-glazed unit there are three glasses, in one-chamber - two).
i is an energy efficient layer (for matching the window to the normative indicators of energy efficiency for the I climate zone, two layers of "energy" are needed - one on the inner and outer glass).
14 is the distance between the glasses in millimeters, which strongly affects the thermal characteristics of the window: the main insulator in the glass pane is the gas environment between the glasses (usually: air, argon, and krypton), and if you compare windows that differ only in the width of the chambers in the glass pane, then the window with a smaller gas interlayer in a double-glazed unit isolates considerably worse (this is true for the width between glasses up to 14-20 mm according to DSTU EN 673: 2009 - further increase in distance does not lead to significant changes in the thermal characteristics of the window and).
Ar - filling the glasses with argon (this is an inert gas that, in combination with i-glass, improves the energy efficiency of the window).

Formula of a double-glazed unit
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Photo: OKNA.ua
Why exactly with energy saving?
Now in Ukraine the process of thermo-modernization of buildings is gaining momentum and already a number of programs on compensation of expenses for warming are already working. Windows can be installed within the framework of these programs, for the I climate zone of Ukraine there must be a two-chamber energy-efficient double-glazed unit filled with inert gas - just the one that is discussed above (see the article "How to buy energy-efficient windows at the price of ordinary ones for account of the state? ").

Additional indicators in the formulation of a double-glazed unit
The glass pane can also have a warm frame and the sunscreen layer is represented by the formula, for example: 4s-10Ar (T) -4-10Ar (T) -4i, where
T - the presence of a warm frame, greatly affects the thermal characteristics of windows, especially with small "warm" glass units, and reduces the likelihood of condensation along the perimeter of the glass unit;
s - the presence of a sunscreen layer (present in multi-functional fiberglass windows, which are used for windows facing the sunny side, in order to reduce the heating of the premises in the summer by the sun).

Other variants of double-glazed windows
4-14Ar-4-14Ar-4i - energy only on the inner glass
4-14-4-14-4 - without energy and argon
4-10-4-10Ar-4i - with one energy and argon in the inner chamber
Options for single-chamber double-glazed windows
4i-16-4i - two glasses with energy
4 [16-20] -4i is the energy on the inner glass, the distance between the glasses can vary from 16 to 20 mm.