The switching time for dimmable glazing from the lightest to the most intense shading depends on a variety of factors. It is influenced by the size of the panes, their geometry and the outside temperature at the exterior pane.
The average switching time is 20-25 minutes for a complete change of colour at a pane temperature > 20 °C.*
This applies to panes of up to 2.5 m² in size. As the size increases, and depending on the geometry, the process can take longer.
Due to its method of function, dimmable glazing switches more rapidly in sunlight and warm outside temperatures. Temperatures under 10 °C lead to significantly slower switching times.
ECONTROL® – Dynamik solar control
We recommend operating an ECONTROL® system in combination with indirect automated control using a light sensor. This ensures that the dimmable glazing reacts promptly to the amount of sunlight, thereby darkening in time when insolation increases. EControl-Glas provides such a control system.
* In keeping with common international definitions for dynamic glazing, this refers to 90% of the maximum change in transmission.
ECONTROL® – specificities when switching ECONTROL® glazing
All ECONTROL® panes have an integrated temperature sensor. One of this sensor's functions is to control the temperature depending on seasonal conditions:
Due to the high absorption of the ECONTROL® panes in connection with the blue shading, the exterior ECONTROL pane becomes warm. It is usual for ECONTROL® panes to reach a maximum surface temperature of around 65 °C in the summer and at maximum shading; in rare cases this can climb to 70 °C. However, this is not a problem, as the panes are made from thermally toughened glass.
At temperatures above 60 °C, which are usually only reached with darkened panes and intense insolation, ECONTROL® panes no longer switch. Once the surface temperature drops over the course of the day or after sunset the pane can again be switched to any desired level.
In winter, when the surface temperature of the panes drops below 5 °C (not the exterior air temperature; this can be significantly lower), ECONTROL® panes are automatically switched to undimmed. As long as the temperature of the exterior surface remains under 5 °C (cloudy sky, diffuse sunlight, frost or snow) the panes remain in the undimmed state. As soon as the sun shines on the panes and their temperature rises above 5 °C, they can be switched to the desired level.
Usually the panes are undimmed in the winter anyway.
Generally, when the exterior temperature falls under 0°C the surface temperature of the panes during the day is more than 10 °C warmer. In other words, at an exterior air temperature of -5 °C the pane surface temperature is > + 5 °C.
Should you want the dimmable glazing to be dark in the morning, the controls can automatically darken the panes on the previous evening.