Presentation and interests of a heated glazing
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How does a heated glass work?
The general principle is almost always the same and is based on the principle of radiation emitted by an electrical resistance (radiant) incorporated in a window, a picture window, a glass ceiling, etc.
Smart glass surface method is based on a layer of metallic micro-particles (by metallic oxides understand copper and silver strips) embedded in the glazing. They are connected to a 220v power supply incorporated in the carpentry. Heated micro-particles emit a radiation towards the inside of the housing. An insulator forces the radiation towards the interior and not towards the exterior.
@Heated glazing Calorglass
For which applications is the heated glass suited the best?
There are numerous potential applications. It may concern premisses:
- where heating technology possibilities are limited. This is the case of verandas, glazed walls or surfaces to remove snow. See how to heat a veranda.
- where the condensation is important and require demisting: spa area, swimming pool, gyms, glass walls in a bathroom, etc.
- where the glazing dimensions are abnormal to provide a maximum light and therefore are difficult to heat (museums, luxury hotels, etc.).
- where available space constraints are important. That’s the case of boats, barges, mobile homes, where each cm counts.
It fits most window frames, sliding windows, glass façades. There are projects for front doors and glazed walls. The largest dimensions are about 2 m x 4 m.
The heated glass may be incorporated without distinction into aluminium, PVC, metal or wood profiles.
The most common power supply is 220V, but they also exist in 115V or 48V.
The heating is controlled by a conventional thermostat which measures the room temperature and sends commands to switch on and off the heating of the window according to the set temperature. The glazing is intelligent in the sense that if you open the window the heating switches off automatically.
Power requirements and sizing: count approximately 20% of the room surface for the heated glazing surface.
Advantages and disadvantages of the heated glazing
Advantages of the smart heated glazings (according to manufacturers):
- Space saving thanks to the removal of some heaters.
- Invisible to the naked eye. Appearance of a traditional glazing.
- Fits to all glazing sizes and materials.
- Limiting the effect of “cold walls” related to glazings.
- Homogeneous heat distribution across the whole glazing towards the interior of the room. It has the same advantages as the radiant infrared heating.
- Reduction or elimination of the condensation on windows.
- Heating system without maintenance.
- Can be combined with other glazing technics (shutter, security, etc.).
- Can be associated to a home automation system to control the heating or detect shocks and prevent burglary attempts (alarm).
Constraints – Disadvantages of heated glazings:
- High energy consumption between 200 and 500W/m² (ideally associate to renewable energy source). 250 to 400w/m² for main heating source (source Saint Gobain Eglas).
- Theoretical efficiency: 3m² of glazing heats about 25m² of inner surface, that is 8m² heated by 1m² of glazing.
- Can hardly replace a whole heating system of a dwelling. The effectiveness depends on the rooms concerned.
- Safety: privilege a quality solution so that the electrical insulation between the electrical heating element (220V) and the users is complete.
- The principle of the radiation is to be able to reach all the cold areas from the heat emitter. So be careful that the concerned glazing can reach all areas to obtain a good thermal comfort. Learn more about the infrared radiation.
- More suited to new constructions than renovations.
- Still very high price.
- Unknown longevity. A priori limited risk of failure.
Heated Glass Price
The price range varies between €1000 and €2000 per m² including delivery and installation. This technology, on average at least 5 times more expensive than standard double glazing, targets high-end residential projects or premium specific projects (restaurants, luxury hotels, etc…).
Main solutions of heated glazing
SAINT GOBAIN GLASS (FRANCE)
Example of combinations that put together a heated glazing:
- External facing SGG PLANITHERM XN which aim is to provide good thermal insulation with respect to the outside
- Heated glass VITRAGE SGG EGLAS
- Laminated glass to ensure complete electric protection for users. Note, in case of impact on the glass, the latter is protected by a laminated glass which also provides an electrical insulation. The electrically energised layer remains inaccessible.
VITRUM GLASS (FRANCE)
Vitrum Glass is the developer of the Smart in Glass® solution for a Plug & Play integration and a smart control of the heated glazing and the whole technological glazings in its range (opacifier, solar migration, OLED…). The surface temperature is 20 to 40°C even in case of very low external temperatures. Vitrum Glass is specialised in design, installation and control of high-end smart glazings.
GROUPE RIO GLASS (FRANCE)
The French industrial group RIOU GLASS (18 factories in France) is, among other, the manufacturer of heated glazing Calorglass®. This manufacturer was awarded the innovation price at the fair of Paris in 2015. The principle is standard for all heated glazings: an invisible layer of metal micro-particles is deposited on the inner surface of the glass. The layer is thus transformed into a heating resistor. The radiation takes place at low temperature (up to 45 °C). The solution is paired with innovative home automation control systems.
IQ GLASS (UK)
IQ GLASS has been one of the leaders in the field of technical and architectural glass for over 12 years in the UK.
HTG (POLAND, SWITZERLAND)
Polish manufacturer of technical glazing (security, anti-fire, architectural, ballistics, etc.) including heated glasses.
GLOW GLASS UK
English manufacturer of heated glazings and in particular of “bi-folding heated glass doors”.