Dec.2017. Low Lambda strips in Passivhaus certified window
The Passivhaus is a certification that defines a standard designing and construction of homes developed by the German Institute of the same name. The main objective of the Passivhaus is to create energy efficient, comfortable and affordable homes.
All the above criteria are achieved through the intelligent design and implementation of the five principles of Passivhaus: thermal insulation, design without thermal bridges, high-end windows, ventilation with heat recovery (commonly cross ventilation), and finally, the construction should be hermetic.
1) Thermal insulation
All opaque building components must be completely insulated.
2) Designs without thermal bridges
There must be no thermal bridges and those that can not be avoided should be minimized as much as possible.
3) High-end windows
The windows must be well insulated and equipped with low emissivity glazing filled with argon or krypton to avoid heat transfer (depending on the demands of each climate zone).
4) Ventilation with heat recovery
Efficient ventilation is key to allow good indoor air quality and energy savings. In passivhaus constructions, at least 75% of the heat of air that is evacuated is transferred to the fresh air that enters by means of a heat exchanger.
5) Hermetic construction
Uncontrolled leaks should be less than 0.6 of the total volume of the house per hour during a pressure test at 50 Pascals (both pressurized and depressurized).
Taking these criteria into account during the construction of a certified home as Passivhaus can save up to 75% of the energy consumed compared to a conventional building. This saving is not only translated as a way to contribute to the environment, but also as an economic benefit for the user.
Although the building itself is the one that obtains the Passivhaus certificate, the German Institute also issues certificates for building elements. This certification aims to help designers and architects to choose construction systems when they have to face the design of a building with Passivhaus requirements. The certificate is then a guarantee of the energy efficiency of the products who possess it.
From the Passivhaus prism, in the Iberian Peninsula, there are two climatic zones, the 'Warm' (warm) that applies to all coastal regions (including Portugal) with the exception of the Cantabrian and the 'Warm-temperate' (warm-temperate) for all the interior.
Technoform Bautec is always looking to contribute to energy improvements and those of its customers, which is why it is very important that CentroAlum has managed to certify its Renova 75 window with 16 channel, as a Passivhaus constructive element suitable for the 'Warm' zone.
This makes it the first aluminum window with thermal breakture in Spain with this certification.
One of the key elements to achieve this is the thermal bridge break that is incorporated in the window, since it is made with Low Lambda strips from Technoform Bautec. These strips have a better value of thermal conductivity (0.21 W / (m · K) than polyamide strips 6,6 with 25% normal fiberglass (0.30 W / (m · K)).
This lower conductivity contributes to achieve the necessary values for the level 5 certification (Warm) that CentroAlum has obtained.
In this way, Technoform Bautec demonstrates the great value of its solutions, and the good disposition it has for its customers in the development of increasingly efficient windows committed to the environmental impact.
With this, it is clear the importance of starting to consider the Low Lambda rods of Technoform as part of new projects, since they open the possibility to reach values suitable for the most demanding certifications that are, without any doubt, the future of construction and the sustainable architecture.