The main premise of passive houses is the low demand for thermal energy for the building. According to the guidelines, it should not exceed 15 kWh/m² per year. In this way, heating costs are reduced, thanks to which the investment in the construction of a passive house quickly pays off. It is also important that, in addition to the low demand for thermal energy, passive houses do not generate a large amount of energy consumption for residential needs. It should be within 120 kWh/m².
Window joinery is one of the very important elements that should be considered already at the planning stage of the construction of a passive house. Incorrectly selected windows can lead to significant heat loss (up to 40%). Thus, the house will not meet the conditions of passive construction. Therefore, in addition to aesthetic qualities, the most important is the heat transfer coefficient (Uw). In the case of openwork joinery, this parameter must not exceed 0.8 W/ (m²K). It is even recommended to strive for the thermal conductivity parameter of passive windows at the level Uw=0.6 W/m2K.
When choosing windows for a passive house, you should pay attention to the previously mentioned key parameters and values. It is they that determine the energy efficiency and passivity of the building.
Deciding on windows made of PVC plastic It is worth considering the system Veka SoftLine 82. This is a profile with a 7-chamber design, which provides excellent thermal insulation. Thanks to its construction, it obtains a heat transfer coefficient for the reference window at the level Uw=0.76 W/m2*K. Opting for larger dimensions, of course, a better parameter can be obtained. Another PVC profile that is perfect for passive construction is Aluplast NeoLine MD. Its 6-chamber design provides a heat transfer coefficient of Uw=0.77 W/m2*K for the reference window. An alternative to the mentioned window profiles can be Decco EconoLine 83. It is an excellent combination of high parameters and an attractive price.
Passive houses are also buildings with large glazing, which deliver a large amount of light and sunlight to the interior. When deciding on this solution, it is worth considering the system Aliplast Star. It is a system with a very modern design line and high thermal insulation. The profile has a thermal spacer with a depth of 45mm, made of solid and proven materials. Another aluminum profile that will be perfect for passive buildings is Aluprof MB 104 Passiv. The Aluprof MB 104 Passive system has a special thermal partition, which guarantees the highest thermal insulation parameters. With the use of insulating elements, it is possible to obtain a parameter of thermal conductivity of the reference window at the level of 0.64 W/m2*K.
Passive construction requires the use of appropriate solutions that reduce energy demand. That is why it is so important to choose the right window joinery. Windows with the appropriate parameters ensure a reduction in heating costs. When choosing a window system, it is worth betting on Veka SoftLine 82, Aluplast NeoLine MD, Decco EconoLine 83, Aliplast Star or Aluprof MB 104 Passive. Thanks to them, the building will have high thermal insulation parameters within the windows. For passive houses, proper installation of the structure is also important. The suggested type of installation is installation in the warming layer.
