Product developers, building owners and designers are taking a new look at high-performance glass facades as key in creating buildings with improved access to daylight, better indoor air quality and improved energy efficiency. But a facade that helps improve a building's interior environment and limits its loss of energy is not enough, say some sources. A building's skin should be a power generator rather than an energy liability.
"Although glass curtain walls are becoming more and more thermally efficient," says Gregory Kiss, a founder of Kiss + Cathcart Architects, Brooklyn, the goal of creating an energy-conserving facade is one of "diminishing returns." His firm has designed a hypothetical 150-story tower to be built in New York City in 2020 with a skin that would be a source of power. The structure, clad entirely in photovoltaic (PV) panels, would generate 60% of the building's electricity requirements. Wind turbines enclosed in PV louvers would supply the rest.