ElectrochromicGlass
Dynamic solar control glass. By applying a low electric current, the panel changes its light transmission from transparent to heavily tinted, eliminating the need for mechanical solar shading devices.
The electrochromic stack is usually laminated into an outer laminated glass, then assembled into a standard IGU with Argon and additional Low-E coatings.
In all-glass architecture, summer thermal loads and glare are the most critical challenges. Electrochromic glass solves the problem at its root: the facade dynamically changes colour like a pair of sunglasses, blocking up to 91% of solar heat without ever obstructing the view.
By applying a very low voltage (about 3-5 volts), lithium ions (Li+) migrate from the storage layer to the electrochromic layer (typically tungsten oxide WO3). This migration colours the tungsten, gradually turning the glass from transparent to dark blue. By reversing the polarity, the ions return and the glass clears. The system is bistable: it consumes energy only during the few minutes of transition.
The use of this glass eliminates the need for external brise-soleil or internal roller blinds, cutting cooling (HVAC) costs by up to 20%. The system integrates with building automation (BMS): rooftop sensors measure solar radiation and automatically darken only the facades exposed to the sun at that precise moment.
Standards
European and international references applicable.
Physical properties
Usage environment
Unlike PDLC (which turns white-opaque for privacy), electrochromic glass turns dark blue-grey but always remains visually transparent. Do not use where total opacity is needed. Systems integrate with building automation (BMS) for automatic shading based on irradiance sensors.
Documented applications
TAV. DOffice Facades (Corporate)
Reducing screen glare without lowering blinds, preserving the psychological benefit of exterior views.
Skylights and Rooflights
High-irradiance horizontal roofs where motorised blinds would be costly and failure-prone.
Hospitals and Clean Rooms
Sterile environments where fabric blinds are prohibited for hygiene reasons.
Aerospace and Premium Automotive
Latest-generation aircraft windows or panoramic roofs of premium electric vehicles.
Solar Factor g (lower = less heat entering in summer)
TAV. EThe Solar Factor (g) indicates the percentage of radiant energy entering the building as heat. Electrochromic glass shifts from g=0.40 (clear, winter) to g=0.09 (dark, summer) in 3-10 minutes, automatically eliminating peak air-conditioning loads.
Operational documents from this sheet
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