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Thread: Electrolysing water

  1. #1 Electrolysing water 
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    How much electrictiy would be needed to electrolyse 1 unit of water (say, 1 litre)?

    And also, how much electricity does the average geothermal power plant produce in a year?

    (I think you can guess where this is going...)


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  3. #2  
    Forum Ph.D. Nevyn's Avatar
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    you mean homework? Busted!


    Come see some of my art work at http://nevyn-pendragon.deviantart.com/
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  4. #3  
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    What do you mean by "how much electricity"? Are you asking about the voltage, energy, current*time, or what?
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  5. #4  
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    current*time would be nice.
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  6. #5  
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    Assume efficiency of 70% in converting the electrical energy to hydrogen.
    http://en.wikipedia.org/wiki/Electrolysis
    The enthalpy change is 285.83 kJ per mole of water (18 grams of water) which works out to 15,879,444 joules per kilogram.
    http://hyperphysics.phy-astr.gsu.edu.../electrol.html
    The largest dry steam field in the world is The Geysers, 72 miles (116 km) north of San Francisco. The Geysers produces over 750 MW net.
    http://en.wikipedia.org/wiki/Geothermal_power
    This is about the size of an average to smallish nuclear or coal fired plant.
    One megawatt-hour is equal to 3.6*10^9 joules.
    Therefore in one hour of operation, The Geysers could hydrolyze around 0.7*750*3.6*10^9/15,879,444 = 119000 liters of water in one hour.
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