LowE - the magic word to explain the whole world of solar irradiation at membrane roofs. Of course, this is not the whole truth but this is it about in textile architecture. This property can be attributed to many membrane materials more or less, especially when the coating or film itself receives appropriate additives. Materials with pronounced lowE properties are found in PTFE glass, silicone glass, PVC-PES and ETFE membranes. These materials typically have a surface coating of metal to reflect as much energy as possible with minimal heating of the substrate. Since metals corrode unfortunately they are part the coating or the film itself. But this also results in a large proportion of the desired effect, which is for example very suitable for covering in ice rinks in order to "separate" the cold air above the ice surfaces from those in the roof construction. This was successfully realized by Temme // Obermeier with the projects in Inzell and Landsberg am Lech.
Low Emissivity (lowE) coatings ensure that as much of the thermal radiation as possible is reflected thus limiting the heating of the coated fabric. The less the membrane material heats up, the less heat can dissipate inside. The more effective this lowE coating is, the more the temperature difference between inside and outside could be, the less you feel the heat on the material itself - this is the general explanation. An influence on the longevity of the different materials is not known actually but it reduces the translucence. ETFE appears e.g. Gray-blue as with sunglasses or sun protection glazing, etc.
- Temperature-resistant as described in the properties of the membranes
- Not more flammable than without low-E particles - according to DIN4102 + EN13501
- High solar reflection by metal particles
- Translucence somewhat restricted, many colors
- Nontoxic since no problematic metals are used (usually TiO2)
- The surface characteristics do not change