Basic principle is that heat difference is used to condense a steam into a liquid then return it to be reheated.
Since heat differences in the ocean will be smaller, then one must substitute ammonia for water as the working fluid.
Above sites typically have thermal gradients higher then 22 degrees C
Energy extracted comes from the cooling of the warmer water --> this is transferred to the ammonia which does the actual work of turning the turbine (as ammonia steam)
Energy extracted proportional to the volume of water and the temperature it drops.
Principal energy loss is when the warmer water meets the cooler water in the condenser.
Total Capacity in the Gulf Coast Waters is many tens of GigaWatts
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