Ben Gurion University of the Negev researchers have developed two reversible panes that will
save energy all year round.
Ben-Gurion University of the Negev develops new Green Window technology
The new all seasons windows reduce energy costs and fuel consumption.
Ben-Gurion University of the Negev (BGU) researchers have developed a new, highly
energy-efficient window technology, featuring two reversible panes that will
save energy all year round in homes and office buildings.
“The ‘Seasons Window’ features the only glazing system that permits effective
passive heating in winter without glare or high radiant temperature near a
window and reduces unwanted solar gains in summer without obstructing the view
outdoors,” explains Prof. Evyatar Erell, a researcher at BGU's Jacob Blaustein
Institutes for Desert Research.
The reversible window system technology features two panes: one clear, airtight
pane, and a smaller, tinted glass with an opening on top and bottom, which
allows air to circulate between the panes. The window panes are fixed to a
single frame and can be swiveled easily during seasonal changes - or even on a
daily basis, in response to changing weather. The window system is intended for
buildings in sunny regions with distinct hot and cold seasons.
In winter, short wave solar radiation is transmitted through the clear glass, and
is absorbed by the tinted glass which faces indoors. The interior is heated in
two ways: by long wave radiation emitted from the warm tinted pane, and by
heating of the air in contact with the warm glass, which flows through the gap
between the panes and returns to a room as much a 20°c. warmer. The clear pane
-- preferably double-glazed with a low-E (emittance) coating -- traps heat
inside the building.
In summer, the glass panes are easily rotated so the tinted glass faces outward
and absorbs the warm solar rays. This pane is then cooled by the outside air
circulating between the two panes. The clear glass pane, which is on the
interior, absorbs unwanted infrared radiation from the warmer exterior pane and
helps to reduce a building’s cooling loads.
According to co-developer and BGU Prof. Yair Etzion, “The heat lost in houses in
various regions depends on both climate and on design and construction.” A
common indicator is energy required to heat or cool a building, per unit floor
area per year, with values ranging from zero to more typical values of 150-300
kilowatts in many older buildings in the United States and Europe. “By
converting solar radiation into heat, our new green window solution conserves
energy and saves money over time.”
The windows will be produced and marketed in Israel by Alubin, an aluminum
About Ben-Gurion University of the Negev and American Associates Ben-Gurion
University of the Negev is a world-renowned institute of research and higher
learning with 18,000 students on its campuses in Beer-Sheva, Sede Boqer and
Eilat in Israel’s southern desert. It is a university with a conscience, where
the highest academic standards are integrated with community involvement,
committed to sustainable development of the Negev. Founded in 1972, American
Associates, Ben-Gurion University of the Negev plays a vital role in helping the
University fulfill its unique responsibility to develop the Negev, reach out to
its local community and its Arab neighbors, and share its expertise with the
world. For more information, please visit
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