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Why a hydrogen economy doesn't make sense - 0 views

phys.org/news85074285.html fuel cell form
shared by dpurdy on 24 Mar 13 - No Cached
  • dpurdy on 24 Mar 13
     
    How inefficient it is to make hydrogen from electricity
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Solar Power Energy Information, Solar Power Energy Facts - National Geographic - 0 views

environment.nationalgeographic.com/...solar-power-profile solar co2
shared by sokolkyl00 on 29 Oct 12 - No Cached
  • Every hour the sun beams onto Earth more than enough energy to satisfy global energy needs for an entire year. Solar energy is the technology used to harness the sun's energy and make it useable. Today, the technology produces less than one tenth of one percent of global energy demand.
  • In one technique, long troughs of U-shaped mirrors focus sunlight on a pipe of oil that runs through the middle. The hot oil then boils water for electricity generation. Another technique uses moveable mirrors to focus the sun's rays on a collector tower, where a receiver sits. Molten salt flowing through the receiver is heated to run a generator.
  • Despite the drawbacks, solar energy use has surged at about 20 percent a year over the past 15 years, thanks to rapidly falling prices and gains in efficiency. Japan, Germany, and the United States are major markets for solar cells. With tax incentives, solar electricity can often pay for itself in five to ten years.
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  • Solar energy is lauded as an inexhaustible fuel source that is pollution and often noise free. The technology is also versatile.
  • valentivin99 on 29 Oct 12
     
    " Today, the technology produces less than one tenth of one percent of global energy demand."
  • kennedyeri98 on 11 Mar 13
     
    Intriguing facts about the suns energy on how they use it on oil and the drawback 
  • bondycal00 on 26 Sep 13
     
    Every hour the sun beams onto Earth more than enough energy to satisfy global energy needs for an entire year. Solar energy is the technology used to harness the sun's energy and make it useable. Today, the technology produces less than one tenth of one percent of global energy demand.
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Fuel Cell Vehicles - 0 views

www.fueleconomy.gov/...fuelcell.shtml hydrogen pollution
shared by mosherrya99 on 22 Oct 12 - No Cached
  • FCVs run on hydrogen gas rather than gasoline and emit no harmful tailpipe emissions.

World_energy_consumption_by_type_2006.png (763×277) - 0 views

started by carrowluk99 on 22 Oct 12 no follow-up yet
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NREL: Hydrogen and Fuel Cells Research - Renewable Electrolysis - 0 views

www.nrel.gov/...renew_electrolysis.html use renewable sustainable hydrogen
shared by giumarraant99 on 24 Oct 12 - No Cached
  • Renewable electrolysis is a process that uses renewable electricity to produce hydrogen by passing an electrical current through water. Renewable energy sources such as photovoltaics, wind, biomass, hydropower, and geothermal can provide clean, sustainable electricity for our nation
  • Wind turbines can be used to produce hydrogen through a process called renewable electrolysis.
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http://www.hydrogen.energy.gov/pdfs/doe_h2_fuelcell_factsheet.pdf - 3 views

www.hydrogen.energy.gov/...doe_h2_fuelcell_factsheet.pdf hydrogen potential future how
shared by efana1 on 13 Mar 12 - No Cached
    • efana1
      efana1 on 15 Mar 12
       
      Good overview of the potential uses
  • daleymax98 on 13 Mar 12
     
    Facts about Hydrogen Fuel Cells
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Energy Resources: Solar power - 0 views

home.clara.net/...solar.htm solar how advantage disadvantage
shared by dpurdy on 03 Nov 11 - Cached
  • Advantages
  • Solar energy is free - it needs no fuel and produces no waste or pollution.
  • Handy for low-power uses such as solar powered garden lights and battery chargers, or for helping your home energy bills.
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  • Disadvantages
  • Very expensive to build solar power stations, although the cost is coming down as technology improves. In the meantime, solar cells cost a great deal compared to the amount of electricity they'll produce in their lifetime.
  • Is it renewable? Solar power is renewable. The Sun will keep on shining anyway, so it makes sense to use it.
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A Pollution-Free Hydrogen Economy? Not So Soon | MIT Technology Review - 0 views

www.technologyreview.com/...e-hydrogen-economy-not-so-soon hydrogen economy co2 pollution
shared by geczyluk99 on 24 Sep 13 - No Cached
  • There’s a much cheaper way to produce hydrogen: spray steam on white-hot coals and out comes mostly hydrogen gas (40 percent) and carbon monoxide (50 percent), a mixture known appropriately as “water gas.” It’s the least expensive way to make hydrogen. Unfortunately, the carbon monoxide produced along with it is highly poisonous. To extract the last bit of energy, the carbon monoxide can be burned, and that turns it into the greenhouse gas carbon dioxide.
  • Electric cars powered by hydrogen fuel cells don’t produce greenhouse-enhancing carbon dioxide. But producing hydrogen does-and if we want to reduce our petroleum dependence, we’re going to have to reconcile ourselves to that fact.
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