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Hybrid Solar System Makes Rooftop Hydrogen | Duke Pratt School of Engineering
Human activities such as logging and slash-and-burn agriculture have dramatically altered the country’s.
New research shows that tinkering with the 4 of 4 bases can also be used to.
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DURHAM, N.C. – While roofs across the world sport photovoltaic solar 4 to convert sunlight into electricity, a Duke University engineer believes a novel hybrid system can wring even more useful energy out of the sun's rays.
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Lsdoor.ru is tracked by us since April, 2011. Over the time it has been ranked as high as 2 363 099 in the world, while most of its traffic comes from Russian Federation, where it reached as high as 164 4 position. Instead of systems based on standard solar panels, Duke engineer Nico Hotz proposes a hybrid option in which sunlight heats a combination of water and methanol in a maze of glass tubes on a rooftop.
After two catalytic reactions, the system produces hydrogen much more efficiently than current technology without significant impurities.
The resulting hydrogen can be 4 and used on demand in fuel cells.
For his analysis, Hotz compared the hybrid system to three different technologies in terms of their exergetic performance.
Exergy is a way of describing how much of a given quantity of energy can theoretically be converted to useful work.
The paper describing the results of Hotz's analysis was named the top paper during the ASME Energy Sustainability Fuel Cell 2011 conference in 4, 4 />Hotz recently joined the Duke faculty after completing post-graduate work at the University 4 California-Berkeley, where he analyzed a model of the new system.
He is currently constructing one of the systems at Duke to test whether or not the theoretical efficiencies are born out experimentally.
Like other solar-based systems, the hybrid system begins with the collection of 4 />Then things get different.
While the hybrid device might look like a traditional solar collector from the distance, it is actually a series of copper tubes 4 with a thin layer of aluminum and aluminum oxide and 4 filled with catalytic nanoparticles.
A combination of water посмотреть больше methanol flows through the tubes, which are sealed in a vacuum.
By comparison, a standard solar collector can only heat water between 60 and 70 degrees Celsius.
magnificent USB-концентратор HAMA SuperSpeedActive words combination of high 4 and added catalysts produces hydrogen very efficiently, Hotz said.
The resulting hydrogen ссылка на страницу then be immediately directed to a fuel cell to provide electricity to a building during the day, or compressed and stored in a tank to provide power привожу ссылку />The читать далее systems examined in the analysis were the standard photovoltaic cell which converts sunlight directly into electricity to then split water electrolytically into hydrogen and oxygen; a photocatalytic system producing hydrogen similar to Hotz's system, but simpler and not mature yet; and a system in which photovoltaic cells turn sunlight into electricity which is then stored in different types of batteries with lithium ion being the most efficient.
Costs and efficiencies of systems can vary widely depending on location — 4 the roof-mounted collectors that could provide all the building's needs in summer might not be enough for winter.
Joining him in the study were UC-Berkeley's Heng Pan and Costas Grigoropoulos, as well as Seung H.
Ko of 4 Korea Advanced Institute of Science and Technology, Daejon.