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Heated glass is a resistance heater created when a transparent, electrically conductive coating is applied to float glass and then subjected to an electric current. The electric current in the coating creates heat energy, which warms the glass until the glass radiates heat.

Design

The manufacturing process begins with the application of a microscopic tin(II) oxide coating to a pane of float glass. This coating is transparent and conducts electricity. Then, two busbars are applied to opposite sides of the glass. The busbars must be perpendicular, and the surface of the glass between the busbars must be flat.

An electric current flows across the tin(II) oxide coating from one busbar to the other. The electrical resistance of the coating produces heat energy, which radiates from the glass. The busbars are connected to a power control unit that regulates the flow of electricity and thus the temperature of the glass. [1][2]

A pane of heated glass can achieve temperatures up to 350 degrees Fahrenheit (177 degrees Celsius).

Use

Heated glass was first developed in World War II to prevent aircraft windshields from frosting over in cold weather and high altitudes. It is still used in aviation for this purpose.

The most common commercial use of heated glass today is to prevent frost from forming on the glass doors of supermarket freezers. In addition, display cases (such as in convenience stores and delis) use heated glass shelves to keep cooked food items from cooling.[3]

Heated glass has also been used in architectural window units to prevent condensation in the form of frost or fog, or as a supplementary heat source for the indoor environment. In North America, heated glass technology is used in wall-mounted and freestanding towel warmers. In Europe, heated glass panels are used in residential space heaters.

References

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