Insulating glass with capacitively coupled heating system
First Claim
1. A heated glass system for heating glass sheet surfaces, said heated glass system comprising:
- a sheet of glass having a generally rectangular shaped configuration;
a transparent, conductive coating applied to a surface of said sheet of glass, said coating having a hemispheric emissivity of less than 0.50;
a pair of bus bars mounted along opposite edges of said sheet of glass and electrically connected to said conductive coating, said bus bars each including a connector for connecting said bus bar to an alternating current power supply to form a circuit through said conductive coating; and
a capacitor connected in series between one of said bus bars and the power supply, said capacitor increasing an impedance of the circuit to reduce current flowing through and to reduce power dissipated by said conductive coating.
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Accused Products
Abstract
A glass heating system includes a low emissivity sheet of coated glass and a capacitor for capacitive coupling the coated glass to a power source. The low emissivity glass is economical to produce and provides superior thermal properties. The low emissivity glass has a low sheet resistance and is coupled to one or more capacitors to increase the impedance of the circuit and reduce the power dissipation by the coated glass. The exact amount of power to be delivered to the coated glass can be varied by changing the capacitor. The low emissivity glass has improved thermal characteristics for use in insulating glass doors for freezers and refrigerators. In a two-paned insulating glass door, the capacitor can be conveniently mounted in the frame of the door or in the space between the two panes.
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Citations
21 Claims
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1. A heated glass system for heating glass sheet surfaces, said heated glass system comprising:
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a sheet of glass having a generally rectangular shaped configuration; a transparent, conductive coating applied to a surface of said sheet of glass, said coating having a hemispheric emissivity of less than 0.50; a pair of bus bars mounted along opposite edges of said sheet of glass and electrically connected to said conductive coating, said bus bars each including a connector for connecting said bus bar to an alternating current power supply to form a circuit through said conductive coating; and a capacitor connected in series between one of said bus bars and the power supply, said capacitor increasing an impedance of the circuit to reduce current flowing through and to reduce power dissipated by said conductive coating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An insulating glass unit comprising:
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a first sheet of glass and a second sheet of glass, each sheet of glass including an unexposed surface and an outer surface; a conductive coating applied to the unexposed surface of said first sheet of glass, said conductive coating having a hemispheric emissivity of less than 0.50; a frame secured around a periphery of said first and second sheets of glass for maintaining the glass sheets in parallel, spaced-apart relationship with the unexposed surfaces facing each other; a pair of bus bars mounted along opposite edges on the unexposed surface of said first sheet of glass and electrically connected to said conductive coating, said bus bars each including a connector for connecting said bus bar to an alternating current power supply to form a circuit through said conductive coating; and a capacitor mounted on said frame and connected in series between one of said bus bars and the power supply, said capacitor increasing an impedance of the circuit to reduce current flowing through and to reduce power dissipated by said conductive coating. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A refrigerated cabinet door adapted to be movably mounted on a refrigerated cabinet, said door comprising:
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a first sheet of glass adapted to be positioned adjacent the ambient environment of the refrigerated cabinet and a second sheet of glass adapted to be positioned adjacent the interior of the refrigerated cabinet, each sheet of glass including an unexposed surface and an outer surface; a conductive coating applied to the unexposed surface of said first sheet of glass, said conductive coating having a hemispheric emissivity of less than 0.50; a frame secured around a periphery of said first and second sheets of glass for maintaining the glass sheets in parallel, spaced-apart relationship with the unexposed surfaces facing each other; a pair of bus bars mounted along opposite edges on the unexposed surface of said first sheet of glass and electrically connected to said conductive coating, said bus bars each including a connector for connecting said bus bar to an alternating current power supply to form a circuit through said conductive coating; and a capacitor mounted on said frame and connected in series between one of said bus bars and the power supply, said capacitor increasing an impedance of the circuit to reduce current flowing through and to reduce power dissipated by said conductive coating. - View Dependent Claims (19, 20, 21)
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Specification