GlassX combinines the translucence of glass with the thermal properties of a solid wall. The quadruple insulating glass unit has phase change material at its core that stores heat and provides a thermal mass equivalent to that of a 16-inch concrete wall, according to the supplier. In summer, when the building interior rises above room temperature, the PCM melts and absorbs the thermal energy that would otherwise lead to overheating. In the cooler night air, it recrystallizes, solidifying completely and beginning the heat absorption cycle again.
GlassX's prism, located in the space between the outer glass panes, reflects summer solar radiation but allows winter solar radiation to pass through, creating a variable solar heat gain coefficient. In addition, GlassX incorporates inert gas and low-E coatings that provide insulation equivalent to that of an R12 wall, according to the company.
GlassX is considered a non-vision wall and a trade-off in the window-to-wall ratio specified in ASHRAE 90.1-2010. It is assembled by glass fabricators and installed by glazing subcontractors.GlassX North America Inc.