"Windows as warm as a wall."
– Pete Petit, Founder
The typical home loses 30% of its heat through windows, so highly insulating windows are an energy efficiency option with a disproportionately large benefit. Energy losses related to windows alone account for as much as 25% of total U.S. natural gas usage.
Well-insulated walls deliver R-12 to R-20 insulation, 3 to 5 times less heat loss than triple glazed windows. Why can't windows be as warm as a wall?
A new Energy Star standard, which raised the window insulation hurdle to R-3.7, went into effect for the Northern region of the U.S. in 2016. One way the window industry meet it is to migrate to triple glazed windows, which are 50% thicker, 50% heavier, and 50% more expensive to make than current dual pane argon-filled glazing. The center pane is at risk of spontaneous cracking due to uneven heating in the hot sun.
Windows are a commodity. Window makers and other players in the glass supply chain want something new to differentiate their products and boost their slim margins.
What they want is a radically new type of window that can insulate as well as a wall. The excessive heat lost by windows would be saved. If this new window cost no more than than those currently available, it would quickly penetrate the market.
V-Glass is working to deliver a solution. The company mission is to develop an inexpensive Vacuum Insulated Glazing (VIG) for windows. Essentially, a VIG is a flat, transparent thermos bottle that dramatically reduces window heat loss. Two panes of glass, separated by tiny spacers, are sealed around the edges. Vacuum between the panes eliminates conduction and convection heat loss. A Low E coating on one pane cuts radiation heat loss.
Unlike argon, vacuum will not conduct heat, no matter how thin the gap. As a result, V-Glass glazing will be as thin as a piece of ¼ inch thick plate glass.
V-Glass vacuum insulated window glass is a product of national strategic importance. Other countries, including Germany, Japan, Switzerland and Russia, have vacuum glass development efforts under way. A successful V-Glass development will enable the United States to participate in the market, and sell product to the rest of the world.