The oceans harness within
themselves two types of energy: thermal energy and mechanical energy. The
mechanical is derived from gravity which moves the tides and waves. The thermal
comes from the sun which alters the temperature of the ocean water.
Like
solar panels in your calculator the surface of the ocean absorbs
solar radiation. The solar panels on the calculator create electricity while
the oceans surface create thermal energy. If only a small portion of
this thermal energy could be harnessed, it could power the whole
world.
In fact, there is so much thermal energy absorbed each day by the oceans
it would equal the thermal output of 250 billion barrels of crude
oil.
There are three ways the OTEC method can produce
electricity.
Closed-Cycle: This
system relies on low-boiling point fluids such as ammonia. The warm ocean water
is used to heat up and boil the ammonia, which will turn a turbine. The turbine
then produces electricity.
Open-Cycle:
This system
relies on a low-pressure environment to actually boil the ocean water and create
steam. When warm ocean water moves into a low-pressure environment
it will boil. The steam is almost pure water as the salts and other
impurities are left behind. The steam then recirculates to deeper and colder
areas of the ocean and condenses back to water. Just like the ammonia
gas, the steam will turn a turbine.
Hybrid System: This
system simply combines both Closed and Open Cycle
systems.
For more info on OTEC visit The National Renewable Energy Laboratory HERE
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