An insulated glass (IG) window unit comprising a double silver coating with an increased ratio of solar heat gain coefficient (SHGC) to thermal expansion coefficient (U value), and corresponding IG window unit for use in an IG window unit or other window Coated products

摘要

The insulated glass (IG) window unit includes a first substrate and a second substrate, and a low emissivity (low E) coating supported by one of the substrates. The low-emissivity coating contains two silver-based infrared (IR) reflective layers and the IG window unit increases the ratio of SHGC to U values and the upper silver-based layer of the coating vs. the thickness of the lower silver-based layer of the coating Make sure that the ratio increases. The low emissivity coating is designed to have a low film side reflectance; for example, if a low emissivity coating is used on the third surface of the IG window unit, the IG window unit is implemented with an IG window unit Or the visible light reflectance when viewed from the outside of the building to be mounted can be reduced.BACKGROUND OF THE INVENTION