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We're not in Kansas anymore: Fluorescent ruby red roofs stay as ...
Elementary school science teaches us that in the sun, dark colors get hot while white stays cool. Now new research has found an exception: scientists have
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Replica Solis RESS-C ADA-compliant retrofit kits convert Sloan Royal and Regal exposed water closet flushometers Body politic-of-the-art photovoltaic technology delivers solar operation Sensor assembly is powered by a solar cell that will harvest power from artificial indoor light, either alight or fluorescent light, and use it as the energy source Automatically initiates a 1.1 gpf or 1.6 gpf flush based on how long user remains in sensor rank Operates by means of an infrared sensor with multiple-focused, lobular sensing fields for high and low target detection for hands-unengaged operation Override button enables manual flushing during power outages and at restroom visitor's discretion Kits can number a valve body with an adjustable ground joint tailpiece connection to upgrade urinal Coyne and Delany valves without replacing endow stop and vacuum breaker or to upgrade Cambridge Brass Teck valve water closet control stop - Fabricator: Sloan Valve Company
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Limited availability of grid-based electricity is a major challenge faced by many developing countries, particularly the rural population. Fuel-based lighting, such as the kerosene lantern, is widespread in these areas, but it is a poor alternative, contributing to global warming and causing serious health problems. Several developing countries are therefore now encouraging the use of sustainable lighting. Solar Lighting gives an in-depth analysis of energy-efficient light production through the use of solar-powered LED systems. The authors pay particular attention to the interplay between energy transformation and device efficiency. They also discuss diverse aspects of renewable energy, including how an improvement in the efficiency of appliances can reduce the cost of energy. Solar...
"You, 0 Sun, are the eye of the world You are the soul of all embodied beings You are the source of all creatures You are the discipline of all engaged in work" - Translated from Mahabharata 3rd Century BC Today, energy is the lifeline and status symbol of "civilized" societies. All nations have therefore embarked upon Research and Development pro grams of varying magnitudes to explore and effectively utilize renewable sources of energy. Albeit a low-grade energy with large temporal and spatial variations, solar energy is abundant, cheap, clean, and renewable, and thus presents a very attractive alternative source. The direct conver sion of solar energy to electricity (photovoltaic effect) via devices called solar cells has already become an established frontier area of science and...
Elementary school science teaches us that in the sun, dark colors get hot while white stays cool. Now new research from Lawrence Berkeley National Laboratory (Berkeley Lab) has found an exception: scientists have determined that certain dark pigments can stay just as cool as white by using fluorescence, the re-emission of absorbed light. The researchers tested this concept by coloring cool roof coatings with ruby red (aluminum oxide doped with chromium). Led by Berkeley Lab scientist Paul Berdahl, they first found that white paint overlaid with a layer of ruby crystals stayed as cool as a commercial white coating. Their results were published recently in the journal Solar Energy Materials & Solar Cells , in an article titled "Fluorescent cooling of objects exposed to sunlight -- The ruby example. Substantial research over the years from Berkeley Lab's Heat Island Group has found that reflective roofs and walls can cool buildings and cars. By reflecting the sun's rays back to space, these cool materials also release less heat into the atmosphere, thus cooling the planet and offsetting the warming effects of substantial amounts of greenhouse gas emissions. "We've heard many times (from roofing materials manufacturers), 'we can't sell white or pastel roofs. our customers want dark green, dark brown, and so on,'" Berdahl said. Over the past 15 years, Heat Island Group researchers have used special pigments that strongly reflect invisible "near-infrared" light to make dark surfaces that stay cooler in the sun than conventional dark surfaces, though still not as cool as... This new work shows that fluorescent cooling can boost the performance of these pigments by re-emitting at longer wavelengths some of the visible light that the surface must absorb to appear dark. This opens the door to darker colors of not only cool roofs but of any object that is subject to prolonged periods of sun exposure, including vehicles, ships, storage tanks, and PVC piping. Using fluorescence, or photoluminescence, for cool materials is a new concept, and Berdahl, who is a physicist by training, has a patent pending on the technology. "People understand that materials that fluoresce are emitting energy," he said. "What's new here is the use of the fluorescence process to keep buildings cooler. When light hits a fluorescent material, the material actively emits energy in response, rather than passively reflecting the energy. Berdahl's idea was to find a material that would absorb visible light and fluoresce (re-emit) mostly or entirely in the invisible near-infrared portion of the sun's spectrum. "There have been thousands of fluorescent compounds identified," he said. "Ruby's properties are well known and well studied, and I realized it's a material that could work. Attached to a bright white coating and exposed to bright sunlight, the dark-red ruby-covered coating stayed cooler than an off-white surface. Berdahl and Berkeley Lab research associate Sharon Chen then synthesized ruby powder, or aluminum oxide, doped with varying amounts of chromium to create different shades of red pigment. They prepared ruby paint from the powders, and applied these paints over bright white substrates. When exposed to sunlight, the ruby paint samples stayed as cool as white materials. "The ruby powder does need more work to make it as deep red as the ruby crystal," Berdahl said. If the product were to be commercialized, Berdahl said that the cost is not expected to be substantial and its durability is expected to be similar to other coatings. "Rubies have a reputation for being expensive, but they're mostly aluminum oxide, which sells for about 70 cents per kilogram (or about 30 cents per pound)," he said. PPG Industries, a Pittsburgh, Pennsylvania-based coating manufacturer also involved in the research, is conducting weathering tests with prototype fluorescent coatings. In follow-up work Berdahl has identified blue materials that also fluoresce and showed that they can be combined with other colors to yield green and even black materials that stay cool.
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Solar street light - Wikipedia, the free encyclopedia
Solar street lights are raised light sources which are powered by photovoltaic panels generally mounted on the lighting structure or integrated in the pole itself.
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