Windows for passive houses
The best energy efficiency
Caring for our planet is the only option! If you are planning to build or renovate an energy efficient home, you should consider your frames. Because aluplast is committed to sustainability, our system engineers have been working for a long time to improve the thermal insulation of our systems, using various technical features. And their success proves that we are on the right track: With energeto®, we have managed to create the first frame system without iron reinforcement, which is able to achieve top insulation performance, thanks to the use of technical innovations such as fiberglass ( powerdur inside), for stability.
energeto® 8000 - Fully passive house according to the standard of Dr. Feist
As the only complete PVC frame system, energeto® 8000 foam inside has received the passive house certificate of Dr. Feist. Thus, not only different types of windows, but also atrium doors, floor-to-ceiling patio doors, sashes with dividers and slides, semi-fixed, fixed or even opening sashes are now certified so that they are compatible with passive houses according to the standard of Dr. Feist. Also, the most common installation cases have been taken into account: walls with an external thermal insulation system, wooden light constructions and concrete cladding blocks. With a construction depth of 85 mm, energeto ® 8000 is ideal for new buildings.
energeto® 5000 - Certified for passive houses by ift
With its small construction depth of only 70 mm, energeto® 5000 is the ideal system for renovation, according to the passive house standard. It has been included in the passive house category according to ift (German Institute for Window Technology) as the first frame system to be provided with such a small construction depth.
Technical terms of passive houses
New buildings
Passive houses are buildings that are not equipped with a conventional heating system. To generate heat, passive houses often use energy from the sun's rays, for example, through the placement of large windows on the south facade. They usually do not have any windows on the north-facing facade, or if they do, the windows are usually very small, as the benefit of solar radiation is small. There are a number of specifications related to the design of windows that apply to passive houses. For example, KfW requires a maximum value of the thermal transmittance coefficient for windows (Uw) to be equal to 0.8 W/m²K for the residence to be eligible for financing, while the private Passive House Institute of Dr. Feist sets additional specifications for individual components, which often increase the price of those components. ift (the German Institute for Window Technology) has also issued a new policy for passive house windows, which roughly corresponds to the average of the two standards described above. For window manufacturers, it should be noted which version is required, as the specifications set out in the tender details should be met, regardless of the existence of other alternatives.
Old buildings
Accordingly, not many old buildings are renovated according to the passive house standard at present, although the German state hopes that this will become the standard in the medium to long term. In the window construction industry, aluplast is the only system supplier that provides a small construction depth of just 70 mm, which is certified according to the passive house standard of the ift (German Institute for Window Technology).
Certificate of passive residence of Dr. Feist. Feist.
The most famous expert in the field of passive house, Dr. Wolfgang Feist, is the head of the Passivhaus Institut, based in Darmstadt. The Passivhaus-Institut PHI uses a set of strict criteria for the certification of building elements: the heat transfer coefficient (thermal permeability) for the windows should not exceed the value: Uw ≤ 0.80 W/m²K in total. The frame itself should be close to the same level: Uf ≤ 0.80 W/m²K. The window is also evaluated after it is installed, where the threshold (limit) reaches an installed value: Uw ≤ 0.85 W/m²K.
Certificate of passive residence according to ift
The German Institute for Window Technology (ift, based in Rosenheim) issues a number of technical certification reports, including the passive house certificate. ift also defines the value of the heat transfer coefficient: Uw ≤ 0.80 W/m²K for the entire window, although the corresponding value for frames is slightly higher: Uf ≤ 0.95 W/m²K.
