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      CommentAuthorAngus
    • CommentTimeMar 30th 2011
     
    Posted By: Trimusing ammonia as the draw fluid.


    You may mean the NH3-CO2 system being developed by Oasys. http://en.openei.org/wiki/Osmotic_Heat_Engine_for_Energy_Production_from_Low_Temperature_Geothermal_Resources_Geothermal_Project.

    It's an interesting idea for redistillation by thermolysis of the draw solution rather than recondensation.
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      CommentAuthorTrim
    • CommentTimeMar 31st 2011
     
    Yes that's the one, I posted about it on this forum quite some time ago, also about the Italians and their carbon electrodes instead of membranes the Dutch are also investigating fuel cells using fresh and salt water.
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      CommentAuthorAngus
    • CommentTimeMar 31st 2011 edited
     
    Fuel cells? Do you mean reverse electrodialysis?
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      CommentAuthorTrim
    • CommentTimeMar 31st 2011 edited
     
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      CommentAuthorAngus
    • CommentTimeMar 31st 2011 edited
     
    OK. That's not a fuel cell. No fuel, no oxidation reaction.

    It also has the problem that the two membranes must be separated by very narrow water channels.
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      CommentAuthorTrim
    • CommentTimeMar 31st 2011
     
    True but a lot of the articles say like a fuel cell to separate it from the Norwegian technology. There's a lot of potential energy going to waste every day many cities are near the sea and a river and membranes are getting better (and cheaper) all the time.
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      CommentAuthorAngus
    • CommentTimeMar 31st 2011
     
    Posted By: TrimTrue but a lot of the articles say like a fuel cell to separate it from the Norwegian technology. There's a lot of potential energy going to waste every day many cities are near the sea and a river and membranes are getting better (and cheaper) all the time.


    I did a reality check recently. The full osmotic pressure between seawater and freshwater is about 400 PSI. In pressure retarded osmosis you extract maximum power when operating at about half the osmotic pressure. But the membranes in their support structures are having difficulty holding off 100 PSI. So we have a way to go. And PRO seems to be by a considerable distance the most advanced technique.

    It's a bummer, because I want to operate at much higher salinity where pressure is even greater. However, there may be workarounds about which I'm not going to talk, hem, hem.
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      CommentAuthorTrim
    • CommentTimeMar 31st 2011
     
    Good luck.
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      CommentAuthorTrim
    • CommentTimeApr 23rd 2011 edited
     
    New Scientist

    Simple 74% no membrane needed, anyone with a small stream running through their land into the sea can get free electricity. Nice

    Using saltiness to make power
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      CommentAuthorTrim
    • CommentTimeMay 5th 2011
     
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      CommentAuthorTrim
    • CommentTimeMar 1st 2012
     
    Physorg

    Have you heard about this Angus, they are using bacteria to help pre clean the organic waste in water?

    Unique salt allows energy production to move inland
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      CommentAuthorAngus
    • CommentTimeMar 1st 2012
     
    Posted By: TrimTechnology Review

    Salty Solution for Energy Generation


    This is a variant of a process described three years ago by Brogiolo PRL 103, 058501 (2009).
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      CommentAuthorTrim
    • CommentTimeMar 2nd 2012
     
    Are you still working/pondering on it?
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      CommentAuthorAngus
    • CommentTimeMar 2nd 2012
     
    Yes.
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      CommentAuthorTrim
    • CommentTimeMar 4th 2012
     
    Good luck.
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      CommentAuthorTrim
    • CommentTimeJun 8th 2012
     
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      CommentAuthorTrim
    • CommentTimeJul 2nd 2012
     
    • CommentAuthorBigOilRep
    • CommentTimeJul 3rd 2012 edited
     
    Posted By: TrimNew Scientist

    Simple 74% no membrane needed, anyone with a small stream estuary running through their land

    Fixed it for you.
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      CommentAuthorTrim
    • CommentTimeJul 3rd 2012
     
    2.2 kilojoules of free energy could be harvested from every litre of fresh water.
    • CommentAuthorenginerd
    • CommentTimeJul 3rd 2012
     
    Posted By: Trim2.2 kilojoules of free energycouldbe harvested from every litre of fresh water.


    I don't understand the meaning of the word "free" here.