Created: 12 September 2007 | Watched by: 12 people | Comments: 0 comments

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  Fuel cell - Wikipedia 

  http://en.wikipedia.org/wiki/Fuel_cell

  [ edit ] Efficiency [ edit ] Fuel cell efficiency The efficiency of a fuel is dependent on the amount of power drawn from it. Drawing more power means drawing more current, which increases the losses ... in the fuel cell. As a general rule, the more power (current) drawn, the lower the efficiency. Most losses manifest themselves as a voltage drop in the cell, so the efficiency of a cell is almost proportional to its voltage. For this reason, it is common to show graphs of voltage versus current (so-called polarization curves) for fuel cells. A typical cell running at 0.7 V has an efficiency of about 50%, meaning that 50% of the energy content of the hydrogen is converted into electrical energy; the remaining 50% will be converted into heat. (Depending on the fuel cell system design, some fuel might leave the system unreacted, constituting an additional loss.) For a hydrogen cell operating at standard conditions with no reactant leaks, the efficiency is equal to the cell voltage divided b   [More...] [Less...]

  First added: 20 September 2007, by: David Wiblin  [Report as spam]

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  Tags:  fuel cell, basics, description, energy conversion, generator , help, what is a   [More...] [Less...]

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  Breakthrough Fuel Cell, Twice as Efficient as Generators 

  http://www.ecogeek.org/content/view/684/

  Acumentrics Corporation, a leading developer of solid-oxide fuel cells and uninterruptible power supplies, has won a 2007 New England Innovation Award from SBANE, the Smaller Business Alliance of New England ... for their novel solid oxide fuel cell. Acumentrics manufactures 5000-watt solid oxide fuel cell systems (SOFC) for power applications. They are also developing combined-heat-and-power units (which are like boilers that produce electricity) for the home market. In 2000 they acquired a novel fuel cell technology. Since then, they have increased the output of a single fuel cell tube from 1 watt to 60 watts. Today they have over 30 units working in the field, including ones that power visitor s centers at Exit Glacier National Park in Alaska, and Cuyahoga National Park in Ohio. One of their key innovations was making ceramic fuel cell technology shatter resistant. It is shatter resistant because of its shape -- it is a tube, not a thin sheet as most others have used --with a special c   [More...] [Less...]

  First added: 20 September 2007, by: David Wiblin  [Report as spam]

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  Tags:  fuel cell, acumentrics, breakthrough, efficiency, innovation , solid-oxide, uninterruptible power, ups   [More...] [Less...]