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       #Post#: 1330--------------------------------------------------
       Solar Ovens
       By: AGelbert Date: June 9, 2014, 3:13 pm
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       New Solar Oven Could Help Save the World's Forests
       Researchers have developed an oven that can cook with the sun's
       heat, even after dark
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       .
       Unless you self-identify with certain counterculture groups,
       chances are pretty good that you've never used a solar cooker.
       While they are decidedly niche items in the U.S., solar cookers
       are a necessity for those in the developing world. Affordable
       and surprisingly low-tech, these ovens use a combination of
       mirrors and clever insulation to harness the raw power of the
       sun.
       The advantages of solar powered ovens are many. The devices are
       easy to make, offer fuel-free cooking, have little to no
       environmental impact, and help to limit deforestation. Of
       course, the technology is not without its shortcomings.
       As you might expect, solar cookers are useless on cloudy days,
       and cooking in the evening is all but impossible. Also, even at
       high noon on the equator, the best solar ovens in use today max
       out at around 300°F. While that's more than enough to cook most
       dishes—given enough time, anyway—certain region-specific staples
       like Ethiopian injera bread require temperatures as high as
       400°F.
       But researchers at the Norwegian University of Science and
       Technology believe they've struck upon a new technique to
       address these shortcomings. They've developed a solar oven that
       is not only able to reach temperatures as high as 482°F, but is
       also able to store that heat over a 24 hour period.
       The solar oven captures the sun's heat in a mixture of salts,
       including fluoride, chloride, and nitrate. This salt mixture
       acts as a solar battery, storing and discharging the heat over
       time.
       With only 3% of its landmass covered in forest—down from as much
       as 40% in the 1960s—Ethiopia is in dire need of fuel-free
       cooking alternatives. While this particular cooker is still in
       the research and development stage, its Ethiopian-born inventor,
       Asfafaw Tesfay, hopes to make the oven available to schools,
       universities, bakeries, and restaurants in the region.   [img
       width=80
       height=70]
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