PV windows cut energy use by 40% in glazed buildings, says NREL – pv magazine International

The results showed that “PV glazing with a power conversion efficiency as low as 6% reduces energy use by more than 30%,” according to the researchers. They said increases in efficiency translate into additional energy use reduction. At efficiencies of 12.5%, perovskite thin-film and transparent PV technologies reach 42% energy-use reduction when integrated into double- or triple-glazed windows.

Dynamic PV glazing reaches almost 50% energy savings and “has the highest potential savings amongst PV technologies,” according to the researchers. However, they noted that the technology has only achieved an efficiency of 11% in a lab setting, so it needs further development to reach its full potential.

“In contrast, static wavelength-selective PV consistently generates more than 500 GJ each month but never exceeds 1,000 GJ for any single month,” said the researchers, who shared their findings in “Photovoltaic windows cut energy use and CO2 emissions by 40% in highly glazed buildings,” which was recently published in One Earth.

PV windows cut energy use by 40% in glazed buildings, says NREL – pv magazine International