Insulated glass unit utilizing electrochromic elements

An insulated glass unit (IGU) comprising three elements:

• (a) an electrochromic (EC) element, (b) a second element that is transparent or is a privacy element configured to reversibly changing its optical state from clear transparent state to an opaque state by application of an electrical voltage, and (c) a third element that is transparent or is a privacy element configured to reversibly changing its optical state from clear transparent state to an opaque state by application of an electrical voltage;
• wherein the said EC element and the second element are separated by a first cavity filled with gas and the said second element and the third element are separated by a second cavity filled with gas;
• and at least one of the sides of the EC element facing the first cavity or at least one surface of the second and the third elements is further coated with a low-emissivity (Low-E) coating, and wherein the said IGU has the following properties:
• (a) the Solar Heat Gain Coefficient (SHGC) of the said IGU is configured to be reversibly varied from about a range between 0.25 and 0.55 down to a range between 0.03 and less than 0.15;
• and (b) the said first cavity and the second cavity are not sealed from each other.

An insulated glass unit (IGU) comprising three elements:

• (a) an electrochromic (EC) element, (b) a second element that is transparent, and (c) a third element that is transparent;
• wherein the said EC element and the second element are separated by a first cavity filled with gas and the said second element and the third element are separated by a second cavity filled with gas;
• and at least one side of the EC element facing the first cavity or at least one surface of the second element, or the third element, or both the second element and the third element, is further coated with a low-emissivity (Low-E) coating, and wherein the said IGU has the following properties:
• (a) the Solar Heat Gain Coefficient (SHGC) of the said IGU is configured to be reversibly varied from about a range between 0.25 and 0.55 down to a range between 0.03 and less than 0.15;
• and
• (b) a R value of greater than 7.5 [BTU/(h−° F.−ft2)]−1.