Energy-Saving for Windows and Doors
- Time of issue:2019-06-20 00:00:00
Windows and doors are one of the most important components of building facades, which carry more complex functions and upon which more requirements are placed by demands from customers, compared with closed and opaque parts, such as walls and roofing. Therefore, it’s more technologically difficult to improve the energy efficiency of windows and doors.
The most important indicator for measuring the energy efficiency of windows and doors is also the thermal insulation performance, which is quantified as “thermal conductivity coefficient”, K-value for short (called U-value in Europe). Generally, at a certain temperature, the smaller the K value is, the less heat is transferred through windows and doors, which means that the thermal insulation performance of the windows and doors is better.
It is required that the U-value of windows should be max. 0.8 W/m2·K, according to Danish 2020 energy efficiency requirements.
However, different from wall and other building materials, it is not applicable for windows and doors to improve the insulation effect only by increasing the thickness of insulation layer, because users will actually touch and use them, which requires their safety, operability, permeability and aesthetics should not be reduced or lost. Energy efficiency improvement of windows and doors must therefore take into full consideration the needs and feelings of customers.
WinGreen has already adopted stricter and higher standards for future when developing new products, and always bears in mind the user’s needs and feelings. With the thickness of profiles to be controlled over a certain range, WinGreen has boldly made a breakthrough in traditional idea of using broken bridge as heat insulation and creatively invented a new thermal insulation material called polyurethane thermal insulation aluminum alloy, or PUR-AL for short. It is a solid profile with high insulation performance formed by the combination of traditional aluminum alloy and polyurethane. The thickness of broken bridge is at least 60mm. Paired with proper energy-saving glass and high-quality hardware, the window or door can lower its U-value between 0.7 and 1.0, with its thickness much smaller than that of the profile by using the broken bridge design to achieve the same U-value.
WinGreen insists on choosing aluminum alloy and polyurethane, these two kinds of common materials, as window and door profiles because they are not only solid, safe and stable, but also compared with other profile materials more widely accepted by the public for being more environmental friendly, universal, inexpensive, and easier to maintain. The users’ interests and their pursuit of high cost performance are always the key elements WinGreen bears in mind. At the same time, we believe only the energy-saving materials accepted by most customers can really promote the idea of energy efficiency.
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