Low emissivity coating for windows in cold climates
OwnerAndrew V. Wagner, Michael J. Buchananinventors
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Abstract
A low emissivity coating 30 includes a plurality of phase adjustment layers 40, 50, 62; a first metal functional layer 46; and a second metal functional layer 58 located over and spaced from the first metal functional layer 46. A ratio of the geometric thickness of the first metal functional layer divided by the geometric thickness of the second metal functional layer is in the range of 0.6 to 1. The low emissivity coating 30 provides a reference IGU summer/day SHGC of at least 0.4 and a reference IGU winter/night U factor of no greater than 0.4 BTU/hr-ft2-° F. (2.27 W/m2-K).
Claims14
A low emissivity coating, comprising:
- a first phase adjustment layer comprising oxides of zinc and tin;
- a first metal functional layer located over the first phase adjustment layer and comprising silver having a geometric thickness in the range of 6 nm to 8 nm;
- a first primer layer located over the first metal functional layer;
- a second phase adjustment layer located over the first primer layer and comprising oxides of zinc and tin having an optical thickness in the range of 155 nm to 178 nm;
- a second metal functional layer located over the second phase adjustment layer and comprising silver having a geometric thickness in the range of 8 nm to 10 nm;
- a second primer layer located over the second metal functional layer;
- a third phase adjustment layer located over the second primer layer;
- and
- a protective layer located over the third phase adjustment layer;
- wherein the low emissivity coating provides a reference IGU summer/day SHGC of at least 0.4 and a reference IGU winter/night U factor of no greater than 0.4 BTU/hr-ft2-° F.
An insulating glass unit, comprising:
- a plurality of glass plies;
- and
- a low emissivity coating located on a major surface of at least one of the glass plies, the low emissivity coating comprising:
- a first phase adjustment layer comprising oxides of zinc and tin;
- a first metal functional layer located over the first phase adjustment layer and comprising silver having a geometric thickness in the range of 6 nm to 8 nm;
- a first primer layer located over the first metal functional layer;
- a second phase adjustment layer located over the first primer layer and comprising oxides of zinc and tin having an optical thickness in the range of 155 nm to 178 nm;
- a second metal functional layer located over the second phase adjustment layer and comprising silver having a geometric thickness in the range of 8 nm to 10 nm;
- a second primer layer located over the second metal functional layer;
- a third phase adjustment layer located over the second primer layer;
- and
- a protective layer located over the third phase adjustment layer;
- wherein the low emissivity coating provides a reference IGU summer/day SHGC of at least 0.4 and a reference IGU winter/night U factor of no greater than 0.4 BTU/hr-ft2-° F.
Dependencies are inferred from the claim text.