Mist lift

Mist lift

Mist Lift is a form of Ocean Thermal Energy Conversion (OTEC) wherein a waterfall is created within the sea to operate a hydro-electric turbine.

Contents

Operation

Mist Lift takes place inside of a low-pressure concrete vessel submerged a few feet below sea level. A vacuum pump maintains a low atmospheric pressure above the water surface inside the vessel. This both lowers the temperature at which the sea water evaporates and allows suction to lift warm water up a pipe from the lower depths of the ocean. Cold water from near the sea surface is used to spray upwards into the warm mist causing it to condense and form a partial vacuum inside the concrete vessel. This pressure difference acts to lift the water below the vessel back toward the surface, keeping the concrete vessel ready for new warm water to be lifted up and continue the process of providing falling water for the turbine to extract energy from.[1]

Operating cost

Mist Lift utilising wave action does not require large pumps and heat exchangers, and is much more efficient than other types of OTEC. Less cold water for the same energy output equates to significant cost savings due to the smaller transfer pipes required.[2]

References

  1. ^ "Out of Gas? Refuel with Mist lift Ocean Thermal Energy". OTEC News 19 April 2005. http://www.otecnews.org/articles/mistlift.html. Retrieved 13 February 2011. 
  2. ^ "Ballistic cold water pipe". U.S. Patents office 06/680352 12/11/1984. http://www.freepatentsonline.com/4603553.html. Retrieved 13 February 2011. 

External links

Oceanic engineering practises


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