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Heat insulation in Passive House construction in
China with warm-edge spacers

High-energy efficient construction methods are the key to a significant reduction in CO2 emissions all over the world. As a modern industrial nation, China also relies on active climate protection through the construction of Passive Houses. Especially in a large country like China with its different climate zones, and correspondingly different requirements for heating or cooling the house, the Passive House concept unfolds its full potential. It reduces the primary energy requirements of the building, in addition to lighting and technical equipment, both for heating and cooling.

The nuts and bolts of the passive house is the optimal thermal insulation of the building. Here the windows are of special importance. Usually triple-glazed, they must prevent energy losses by transmission. This is important for the Uw-value of the window. In order to keep this as low as possible, additional warm edge spacers are installed between the glass panes. It is important that all components are Passive House certified or suitable. The “Made in Germany” warm-edge spacer Thermix® from Ensinger, for example, is a guaranteed passive house solution. In Germany, Thermix® is regularly Passivhaus-certified by the “Passive House Institute”. The warm-edge spacer from Ensinger is also listed in China by the “Passive low energy building products selection directory” and recommended for optimum thermal insulation in Passive Houses. Thermix® is Passive House suitable for hot and cold climates.

Active for the Passive House

Even as passive houses were still a niche topic, the founder and innovator of Ensinger, Wilfried Ensinger already saw the future of improved thermal insulation in warm-edge spacers. Thermix®, one of the first hybrid spacers made of highly heat-insulating plastic and stainless steel, is similarly easy to process as aluminium spacers. The special plastic used, however, has a 700 times lower heat transfer coefficient. A thin stainless steel diffusion barrier ensures that the space between the panes of the insulating glass remains permanently gastight.

Safety and quality through official listing

The Chinese “Passive low-energy building products selection directory” and the German “Passive House certification” give developers, builders, planners and architects more planning security. Manufacturers of metal windows can be assured with certified and listed products like Thermix® to only fit passive, high-quality components into their windows and thus increase the quality of their own products.

Passive House principle
A Passive House gains a large portion of its energy from the heat recovery of the radiated heat of people and technical equipment in the house. The requirement for this is optimal thermal insulation, which does not allow any energy to escape through walls, windows or the roof. The ventilation system brings fresh air into the house and also decimates heat losses, since the passive house is built air-tight.

Picture credits: Ensinger GmbH, Germany

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