Substrate having thermal management coating for an insulating glass unit
View Patent ↗A coated article is provided for use in an IG unit. The article includes a substrate and a coating formed over at least a portion of the substrate. The coating includes a plurality of separation layers having one or more dielectric layers and a plurality of infrared reflective layers. The coating can be positioned on the #2 or #3 surface of the IG unit and can provide a reference solar heat gain coefficient of less than or equal to 0.35.
1. An insulating glass unit, comprising:
a first pane defining a #1 surface and a #2 surface;
at least one second pane comprising clear glass and defining a #3 surface and a #4 surface, with the #2 surface facing the #3 surface; and
a coating formed over at least a portion of the #3 surface;
wherein the coating comprises
a first separation layer comprising a zinc oxide layer over a zinc stannate layer, wherein the zinc oxide layer has a thickness in the range of 75 Å to 150 Å;
a first infrared reflective layer deposited over the first separation layer;
a second separation layer comprising a first zinc oxide layer having a thickness in the range of 75 Å to 150 Å, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer having a thickness in the range of 75 Å to 150 Å deposited over the zinc stannate layer;
a second infrared reflective layer deposited over the second separation layer;
a third separation layer comprising a first zinc oxide layer having a thickness in the range of 75 Å to 150 Å, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer having a thickness in the range of 75 Å to 150 Å deposited over the zinc stannate layer; and
a third infrared reflective layer deposited over the third separation layer; and
wherein the coating provides the unit with a reference solar heat gain coefficient of less than or equal to 0.36.
2. The unit of claim 1 , wherein the coating provides a reference heat gain coefficient of less than or equal to 0.32.
3. The unit of claim 1 , having a reference visible light transmittance in the range of 50% to 60%.
4. The unit of claim 1 , having a reference transmitted a* (a*T) in the range of −5 to −12.
5. The unit of claim 1 , having a reference transmitted b* (b*T) in the range of 0 to 5.
6. The unit of claim 1 , having a reference exterior visible light reflectance (Rext vis) in the range of 5% to 15%.
7. The IG unit of claim 1 , having a reference reflected exterior a* (Rexta*) in the range of −2 to −10.
8. The IG unit of claim 1 , having a reference reflected exterior b* (Rextb*) in the range of −0 to −5.
9. The IG unit of claim 1 , having a reference shading coefficient of less than 0.41.
10. The unit of claim 1 , wherein the first pane comprises tinted or colored glass.
11. The article of claim 1 , wherein the infrared reflective layers include at least one metal selected from the group consisting of gold, copper, silver, or mixtures, alloys, or combinations thereof.
12. The article of claim 1 , including a fourth separation layer comprising at least one dielectric layer deposited over the third infrared reflective layer.
13. The article of claim 12 , wherein the fourth layer comprises a zinc stannate layer deposited over a zinc oxide layer.
14. An insulating glass unit, comprising:
a first pane defining a #1 surface and a #2 surface, the first pane comprising tinted or colored glass;
at least one second pane comprising clear glass and defining a #3 surface and a #4 surface, with the #2 surface facing the #3 surface; and
a coating formed over at least a portion of the #3 surface, wherein the coating comprises:
a first separation layer comprising a zinc oxide layer deposited over a zinc stannate layer, wherein the zinc oxide layer has a thickness in the range of 100 Å to 150 Å;
a first infrared reflective layer deposited over the first separation layer, wherein the first infrared reflective layer is silver;
a second separation layer comprising a first zinc oxide layer, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer deposited over the zinc stannate layer, wherein the zinc oxide layers have thicknesses in the range of 100 Å to 120 Å;
a second infrared reflective layer deposited over the second separation layer, wherein the second infrared reflective layer is silver;
a third separation layer comprising a first zinc oxide layer, a zinc stannate layer deposited over the first zinc oxide layer, and a second zinc oxide layer deposited over the zinc stannate layer, wherein the zinc oxide layers have thicknesses in the range of 100 Å to 120 Å;
a third infrared reflective layer deposited over the third separation layer, wherein the third infrared reflective layer is silver; and
a fourth separation layer comprising a zinc stannate layer deposited over a zinc oxide layer;
wherein the coating provides the unit with a reference solar heat gain coefficient of less than or equal to 0.36, a reference visible light transmittance in the range of 50% to 60%, a reference transmitted a* (a*T) in the range of −5 to −12, a reference transmitted b* (b*T) in the range of 0 to 5, a reference exterior visible light reflectance (Rext vis) in the range of 5% to 15%, a reference reflected exterior a* (Rexta*) in the range of −2 to −10, a reference reflected exterior b* (Rextb*) in the range of −0 to −5, and a reference shading coefficient of less than 0.41.