Heat from the sun gets absorbed our atmosphere, and therein lies the basis of global warming, but Stanford scientists have developed a panel that can return heat to space. *Is this a tool for future geo-engineering? *March 2013 http://news.stanford.edu/news/2013/april/fan-solar-cooling-041513.html
*Cool roofs reflect sunlight during the day. Night sky radiative roofs can evacuate longwave radiation **through the 8-12µm atmospheric window.* <http://news.stanford.edu/news/2013/april/fan-solar-cooling-041513.html> <http://news.stanford.edu/news/2013/april/fan-solar-cooling-041513.html> Today's Green Minute with Jim Parks “Nano Panels Beam Heat Into Space!” Movie on http://www.youtube.com/watch?v=ETJhxMMKn68 <http://www.youtube.com/watch?v=ETJhxMMKn68> http://goldrushcam.com/sierrasuntimes/index.php/mariposa/columnists/todays-green-minute-with-jim-parks/10735-todays-green-minute-with-jim-parks-nano-panels-beam-heat-into-space If a roof is painted white, it’s reflecting sunlight rather than absorbing it. If a roof is “green,” it’s planted with living greenery that blocks sunlight and cools the building by evaporation. Now there’s a new wrinkle: a panel from researchers at Stanford University that reflects sunlight, draws heat from the building it’s mounted on, *and, amazingly, transmits that heat through the atmosphere and back into space.* The panel acts as a conventional mirror in that it reflects sunlight, but a mirror can still get hot, and that’s where the panel’s unique ability to emit heat radiation comes into play. The earth’s atmosphere traps thermal radiation (the greenhouse effect) but the panel’s nanostructured photonic materials (quartz and silicon carbide) emit heat at a wavelength that causes it to pass through the atmosphere. The researchers (Professor Shanhui Fan and graduate students Aaswath Raman and Eden Rephaeli http://phys.org/news/2013-03-solar-cools-full-sunlight.html ) say that “a typical one-story, single-family house with just ten percent of its roof covered by radiative cooling panels could offset 35 percent of its entire air conditioning needs during the hottest hours of the summer.” They point out that there are plenty of other applications, including cooling in equatorial regions and cooling parked cars. Additionally, the panels have no moving parts and require no power source. *We wonder if the technology could be developed to a much larger scale – one that could lower the temperature of this increasingly heated planet.* also in "Fighting global warming with nanotechnology" http://www.gmanetwork.com/news/story/301887/scitech/technology/fighting-global-warming-with-nanotechnology <http://goldrushcam.com/sierrasuntimes/index.php/mariposa/columnists/todays-green-minute-with-jim-parks/10735-todays-green-minute-with-jim-parks-nano-panels-beam-heat-into-space> -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/groups/opt_out.
