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Worldchanging: Bright Green: Concentration
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Concentration
Jamais Cascio July 15, 2005 5:55 PM
We're all familiar to some degree with traditional photovoltaics, the flat dark-gray panels that generate electricity from light. Improvements in photovoltaic technology keep popping up, and solar will undoubtedly be a big part of the bright green future. But less well-known are photovoltaic concentrators , systems that use lenses and/or mirrors to boost the amount of light hitting a given patch of photovoltaic material, with the goal of increasing the overall output. Photovoltaic concentrators are commonly used on satellites to maximize the power-to-weight ratio, but have had more limited success for Earthly energy production due to the cost.
That may soon change.
The US National Renewable Energy Laboratory just held a conference on photovoltaic concentration technology in Scottsdale, Arizona. Among the announcements : the availability of PV concentration systems with efficiencies close to 40% at concentrated sunlight levels.
At the conference, NREL announced a new record efficiency of 37.9 percent at 10 suns, a measure of concentrated sunlight. Soon thereafter Boeing-Spectrolab, under contract to NREL and the Department of Energy, surpassed the NREL record with 39.0 percent at 236 suns announced at the European photovoltaic conference in Barcelona, Spain.
This should allow PV concentration system makers to reach their near-term goal of a $3/watt installed price, roughly competitive with other forms of power generation.
Most PV concentration systems are big, 20-35 kilowatt units able to track the motion of the Sun across the sky. The latest Wired , however, has an article about the " Sunflower Solar Concentrator ," small enough to be carried by two people, and operating at 200 wa"
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