Electrochromic glass in the conservatory


The summer heat protection is probably one of the biggest challenges at Wintergaten. Only very sophisticated solutions are reasonably optimal, without an automatic control of the individual shading elements is usually not. Electrochromic or "intelligent" glass offers an interesting alternative here. Read more here.

How electrochromic glass works

Electrochromic glass surfaces are usually constructed in sandwich construction. As with a conventional thermal insulation glazing, there is a two-disc system, as the outer pane is a disc made of electrochromic laminated glass used.

The composite disk contains a microscopically thin layer of tungsten oxide or polyaniline. This is the active layer whose light transmission can be controlled.

Dimming and dimming

If a low DC voltage is applied to the electrochromic laminated glass pane, it "dimmes" itself. The molecules of the coating become optically active and change their color. In most cases, DC voltages of about 3 volts are used, the resulting color is then slightly bluish.

Dimming can be easily stopped by switching off the applied voltage. If the polarity of the voltage is reversed, the glass becomes transparent again.

power requirements

Power is only required until the completion of the dimming phase or the dimming phase, ie during the control processes. The small amount of electricity that is needed, even with large glass surfaces only leads to a very low power consumption.

Alternative: Thermochromic glass

The thermochromic glass uses two sheets of glass laminated together with a special foil in between. Thermochromic glasses need no control, they control the light transmission through the thermochromic materials automatically.

As the glass heats up (for example, by sunlight on the glass surface), the thermochromic materials begin to become active and discolour. This prevents further solar radiation and heating of the conservatory.

A decolorization takes place again when the glass cools down. This creates a completely automatic control of the room temperature through the glass surface itself.

Smart glass at the winter garden

Electrochromic and thermochromic glass surfaces offer a number of important advantages, especially for the residential conservatory, where shading is extremely important:

  • the control can be completely automatic
  • it can be kept automatically a certain temperature
  • The costs for planning, conception, acquisition and maintenance for mechanical shading solutions are eliminated
  • a controller can also work perfectly during your absence
  • with switchable glasses can also be controlled by a temperature sensor inside
  • Glare protection is achieved even without complete darkening

At the same time as the heat protection function of the glasses, cold protection can also be achieved by simply using a correspondingly efficient triple glazing. This even allows the values ​​of passive house windows to be achieved, up to 0.5 W / (m²K) is possible with electrochromic glazing.

Price for electrochromic glazing

The glass, also known as "smart glass", is slowly spreading to the German market as well, with the early high prices starting to drop significantly.

For example, at EControl, the price per square meter is around EUR 700 per m², but other manufacturers are also represented on the market, such as Infraselect or SageGlas.


Video Board: SFI ElectroChromic Glass for Office