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Energy storage in quicklime (CaO) by a sunparabol?

  1. Oct 18, 2005 #1

    I am at my university working on an idea if it would be possible to store heat energy in quicklime CaO.
    We are to use a solar parabol to concentrate the sunlight and get a temperature in focus around 1000 C degres.

    In that temperature it is possible to burn limestone to quicklime and then save it in a airtight storage.
    1000 kg have about 320 kWh and can be bought in my country for around 45 $/1000 kg.
    Does anyone know if we are wrong about this becouse it seems to easy to save energy this way.
    To save energy to heat a house I need to burn around 15000 kg to be able to heat a house over the winter and I try to calculate how big solarparabol we need to build to be able to burn 15000 kg limestone to quicklime in a summer.

    After the winter the reaction with water have turned CaO to Ca(OH)2 and it can be burned again to store energy for the next winter.

    Do you think it is possible?
    Have anyone heard if someone does something like this?
    Nobody have tried it in my country so I hope someone out there know something.

    I found a PDF-document that NASA did about it, so it seem possible.


    Regards Magi
  2. jcsd
  3. Oct 19, 2005 #2
    Very interesting proposal..
    it sounds plausable to me..
    one question , are you saying the sun does not shine in winter in sweden?
    you seem to be (roughly) at the same lattidude as southern alaska.?
    another question , during the heating process ( with sunlight) is the hydroxide given off as O2 & H2 , or is it steam?
  4. Oct 22, 2005 #3

    We have sun here in winter but i guess I will need a bigger surfice in the parabol to be able to reach 1000 degrees.

    When burning calciumhydroxide you get steam ive been told.


  5. Oct 23, 2005 #4
    because if your device liberated H2 & O2 you could burn that too..
    Say that you have this large pile of Ca(OH)2 , you might need some way to get the stuff in the center to the outside , where it can be heated .
    or just heat smaller portions of it..
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