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L'éclairage solaire hybride!?
Lighting Research (NL)
· Source ADIT, 10/2003:
On capte la lumière solaire sur le toit et
on la transporte par fibres optiques à l'intérieur, où
est est combinée avec les éclairages artificiels...
ORNL to showcase new solar technology Oct. 7-8
OAK RIDGE, Tenn., Sept. 24, 2003 -- Representatives
from major retailers, the lighting industry and the Tennessee Valley Authority
are scheduled to participatee in a hybrid solar lighting summit hosted
by Oak Ridge National Laboratory Oct. 7-8.
Hybrid solar lighting, which is nearly 10 times
more efficient than the most affordable solar cells today, is a concept
being developed at the Department of Energy's ORNL. Jeff Muhs, who leads
the research effort, notes that the technology offers additional advantages
compared to more traditional approaches of harnessing the sun's light and
"Unlike conventional solar energy approaches that
convert sunlight into electricity and pay the price of photovoltaic inefficiency,
hybrid lighting uses sunlight directly," Muhs said. "Roof-mounted collectors
concentrate sunlight into optical fibers that carry the light inside buildings
to hybrid light fixtures that also contain electric lamps."
As the two light sources work in tandem, control
systems keep rooms at a constant lighting level by dimming the electric
lights when the sunlight is bright and turning them up as clouds move in
or as the sun sets. The result is a dramatic improvement over conventional
approaches to bring sunlight into buildings.
The hybrid solar lighting system also overcomes
a number of limitations of conventional approaches.
"Daylit buildings are comparatively more costly
to design, more constrained in terms of space utility, more difficult to
cool during the summer, more difficult to evenly illuminate and more likely
to develop maintenance problems caused by large roof penetrations," Muhs
From an economic perspective, a study for DOE by
the Antares Group concluded that up to 1 million hybrid solar lighting
systems could be in use by 2020, saving rate payers billions of dollars
Scheduled to speak at the first of what is planned
to become an annual event are Bill Baxter, director of TVA, Glen Strahs
of DOE's Office of Solar Technologies, and several representatives from
ORNL, universities and industry. The summit will focus on policy, technology
and market forces that influence the development and commercialization
of hybrid solar lighting.
Also scheduled to attend are representatives from
several of the nation's major commercial lighting products and technologies,
and major utilities. Muhs envisions the summit leading to a valuable exchange
of ideas and ultimately collaborations among DOE, universities and industry.
"Virtually everyone has a stake in this," Muhs said.
"From energy and environmental policy makers to scientists, engineers,
architects, and solar and clean energy advocates, this is a technology
that can make a difference to the environment and to people's quality of
In addition to demonstrations planned by TVA, the
Mississippi Technology Alliance and the Sacramento Municipal Utility District,
retail giant Wal-Mart has expressed interest in hybrid solar lighting and
is considering testing systems at new stores in the Sun Belt and the Midwest.