Passive House Windows
In passive house the windows play an important role in two ways: heat loss can be reduced despite large glass areas and windows open possibilities for heat gain through solar irradiation.
Internorm’s highly thermally insulated windows fulfil this double role exemplary which first appears contradictory. Ug values as low as 0.4 W/(m2K) can be achieved with thermal insulation glazing which is used in passive houses.
Advantages of passive house windows
Passive House windows are tripled glazed and the frames are also very well insulated to fulfil the high requirements. At least a third of the of window unit consists from the frame, so the quality of the frame insulation must be perfect.
Our passive house windows have the following advantages:
- Highest quality thermally insulated glazing.
- Highest quality thermally insulated frames.
- Thermally optimised edge compound.
- Hight quality professional installation.
A crucial stage in planning for a passive house is the positioning and orientation of the windows to optimise the necessary amount of solar gain for each area of the building. For the winter months the positioning of the windows allow for more solar energy to enter the building than release warmth from to the outside. It is common practice that larger glass areas are positioned South-facing. In the Summer months the sun is higher in the sky resulting in less sunlight being able to reach the interior of the building thus the majority of it is reflected. Consequently, solar irradiation on south-facing windows is reduced in summer and normally no extra sun protection is necessary. Areas of concern come sometimes come from the East and West orientation of the building. The low level sun at these times increases the chance of overheating so added precautions are sometimes taken for relevant sun protection.
A common figure for Solar irradiation from South facing windows affecting the East and West sides of the house often average around 60% whereas the North elevation commonly only receives 40%.Passive houses should keep to a max. deviation from south facing by 10°.
Data on the sun’s positioning throughout the whole year as well as environmental shading caused by trees, buildings and objects is important in the planning of a passive house.
A highlight of alpine architecture - in passive house standard
'Schiestlhaus' - Styria: passive house at an altitude of 2154 m. A high alpine mountain chalet that is incredibly effective at its energy efficiency, so much so that It does not require any direct electricity connection to the main grid and runs purely on economic and ecological sustainability. The whole nature of Schiestlhaus energy fuelling, is built around the optimising and storing of solar gain from the South side of the building. The fact that more warmth is taken in than given off is another feature of the highly insulating Internorm windows. As well as the solar panels there is a rapeseed oil heating and power unit, a sophisticated ventilation system with a 85% heat recovery rate, as well as the building utilising 100% of the rainwater collected. The 'Schiestlhaus' really is cutting edge when it comes to building technology.
'Schiestlhaus' was awarded first prize of "Energy Globe" in the federal provinces category. General planer ARGE: pos architekten ZT-KG (planing) www.pos-architecture.com, Treberspurg&Partner ZT GmbH (tender and building supervision)