Energy efficiency standards can be confusing. A good insulating structure has a low ‘U-value’.
Most manufacturers quote the U-value of their glazing units (defined as Ug) rather than the whole unit’s (Uw) energy efficiency. Besides the glazing however you have to consider the insulation of the window frame (defined as Uf) as well as thermal bridges at the glass edge and in the connecting area window to wall.
“The Uw value refers to the whole window and is a true indication of the energy efficiency of a window or door unit – so this is what you should look for when comparing window & door products”
Thanks to the energy-saving triple-pane technology and the innovative special SOLAR+ coating, climate protection windows from Internorm achieve optimal solar gains and guarantee maximum thermal insulation. This reduces the emissions of CO2, widely reckoned to contribute to global warming.
AVOIDING HEAT LOSS IN YOUR HOME
The fact that around 30% of the heat of a house can be lost via the windows is the reason for the increasing demand for high thermal insulation windows. However, it is not generally the glass that creates the thermal insulation properties. The entire structure of the window unit needs to be insulated to avoid thermal bridging.
INSULATING GAP BETWEEN PANES
With Internorm windows & doors, heating costs are saved through precious metal coatings that are applied in a wafer-thin layer to the surface of the glass and ‘noble gases’ in the gaps between the inner and outer panes. The noble gases used are argon and krypton. They have a much lower heat conductivity than air and thus also reduce the heat loss to the outside.
The differences in the thermal insulation value Ug result from different coating structures and noble gases. Furthermore, the thermal insulation values are better with triple glazing than with double glazing.
TRIPLE-PANE HEAT PROTECTION GLAZING
Bigger windows – no loss of heat
Compared to double glazing, the high insulation properties of the Internorm window systems with triple heat protection glazing allow an increase in glass area of up to 40% without any effect on the heating costs.
The use of this type of insulating glass significantly improves the energy balance and thus keeps the heating costs low. Furthermore, the special SOLAR+ coating allows solar energy gains and therefore additional heating free of charge from sunshine.
Our premium glass coating offers unprecedented thermal insulation, making it extremely eco-friendly. It also offers high transparency, ensuring up to 10% more daylight
Internorm Glass Types
INSULATING GLASS & VSG (LAMINATED GLASS) & ESG (TOUGHENED GLASS)
Thermal insulating glazing.
The innovative coating of the glass pane allows more light and more energy into the inside than any other special glazing. This makes your living areas on the one hand even lighter, on the other hand the coating offers excellent thermal insulation. Thus heat loss is very low and you can enjoy even more daylight – a crucial advantage especially in the dark winter months.
The one pane security glass (ESG – toughened glass) lends increased resistance against mechanical and thermal tensions. The composite security glass (VSG – laminated glass) ensures burglary protection through active and passive security. The splinter-free glass with a tear-resistant, elastic layer additionally gives protection from injuries.
“Compared to double glazing, the high insulation properties of the Internorm window systems with triple heat protection glazing allow an increase in glass area of up to 40% without any effect on the heating costs”
European Standards – calculating the true U-value of a window unit:
According to the European standard DIN EN ISO 10077-1, the insulation values of a window are calculated by splitting it into three zones: frame, glazing and glass composite edge. The components for the calculation are named accordingly: Uf (f for frame), Ug (g for glazing) and ψ (psi = glass composite edge). The values Uf and Ug are factored into the calculation with their respective area. By contrast, the glass edge psi is considered according to its length. From these components, the total thermal insulation value Uw (w for window) is calculated according to the following formula:
Uw = (Af • Uf + Ag • Ug + lg • ψg) / Aw (W/m²K) *see note
Uw: U-value of the window [m²]
Aw: area of the entire window, including the frame
Ag: visible glazing area [m²]
Ug: uninterrupted glass U-value [W/m²K]
Af: frame area [m²]
Uf: U-value of the frame [W/m²K]
lg: circumference of the glazing (length of the glass composite edge
ψg (psi): thermal bridge loss coefficient of the glass edge in W/mK
* Important note: The Uw value therefore refers to the whole window unit and is a true indication of the energy efficiency of a window or door unit – so this is what you should look for when comparing products.
Internorm SOLAR+ Glazing
The glazing can be used to control the insulating properties of the window and the quality of the relationship between the inside and outside. Internorm achieves the best insulating values with triple glazing as standard. But the window can do more: Thanks to the SOLAR+ coating it supplies heat.
The SOLAR+ triple insulating glass has an extremely high thermal insulation. It also has a total energy transmission value (g-value) that can otherwise only be achieved at this level with double glazing. Due to this special relationship between thermal insulation (U-value) and energy transmission (g-value), these glasses are perfectly suited for solar construction.
In winter in particular, it utilises the weak solar irradiation optimally and keeps the heat gained in the building. The high g-value allows the gain in passive solar energy to be optimised, even if the construction site is not optimal or the glazing is not precisely south-facing.
THE BENEFIT FOR CLIMATE PROTECTION
Efficient energy usage is one of the most important measures against climate change. Thanks to the energy-saving triple-pane technology and the innovative special SOLAR+ coating, climate protection windows from Internorm achieve optimal solar gains and guarantee maximum thermal insulation. This reduces the emissions of CO2 and SO2, widely reckoned to contribute to global warming.
MORE LIGHT, MORE BRILLIANCE with Internorm SOLAR+ technology
The high light transmission produces a more welcoming brightness inside: an important advantage, particularly in the dark winter months.
With Internorm, larger windows and doors can be produced without compromising the energy efficiency of the whole unit. The Solar+ triple glazing contributes to heating your home too!