Ocean Energy, Direct Tide Currents Energy Generating Systems
Direct Tide Currents Energy Generating Systems
Another type of tide current turbine devices are the depicted on system “A“and “B”
below in which the currents generating by the tides are managed as rivers to generate
energy, in the proposed system “A” the turbine is anchored on the sea floor and by
two mechanical arms, the turbine is kept at the optimum current flow dept to catch
the most of the energy, this system is specially suited for shallow waters with no
more per say 50 meters deep or close to the shore due to difficult of the lever mechanism
involved. Some ocean currents are very wide and powerful and can provide a lot of
energy if the system is properly designed.
Another variation of the system “A” is the system B, in which the turbine is suspended
from a floater to adjust the turbine to an optimum currents depth, the floater and
the turbine arrangement is kept in position with a cable anchored to the sea floor,
the system permits the turbine to be adjusted to the proper height as the sea level
changes. The turbine used for this application has to be also designed to run with
low speed flows.This system is better suitable to deeper water as compared with
system A, with no specific depth limit. The turbine can be directly attached to an
electrical generator, a water pump or to any other energy converter mechanism.
Is important to mention that these systems have a lot of potential as a viable source
of electrical power generation, cost and environmentalists have influenced the slow
development and applications of this technology in view of concerns for the marine
life and other ecological impacts.
To effectively make use of the relatively slow tidal currents, tidal turbines are
designed to run with tidal currents speed in the range of 6.0 to 10.5 km per hour
or 1.7 - 3.0 meters per second.
The department of energy of USA reports that a tide turbine with a diameter of 15
meters with a current speed of about 8 km/sec produces as much energy as a wind generator
with a 60 meter wind turbine, the reason for this is the higher density of the water,
more density means more mass, more mass means more power. The best location for the
installation of a tide turbine is near the shore at about 10 to 30 meters deep.