Underwater windmills, also known as tidal turbines, extract power from tidal currents and function similar to traditional wind turbines. They consist of blades mounted on a hub that spin a generator via a gearbox to produce electricity. The tidal currents cause the blades to rotate and turn the generator. Underwater windmills offer a renewable source of energy with no emissions, but they have high initial costs and require specialized materials and difficult installation underwater. Overall, tidal power provides a reliable source of clean energy from the predictable tidal patterns.

1. 1
ADNAN
S7 CIVIL
MESITAM
2014-2018

2. CONTENT
• INTRODUCTION
• RENEWABLE ENERGY
• UNDERWATER WINDMILL
• MAIN PARTS
• PRINCIPLE
• WORKING
• MAINTENANCE
• ADVANTAGES
• DISADVANTAGES
• CONCLUSION
• REFERENCES 2

3. INTRODUCTION
• An Underwater windmill is a device that extracts power from
the tides
• Renewable Energy is used
• Renewable energy technologies are alternative to
conventional energy sources to reduce fossil fuel related
issues
• They are cheap and do not damage the environment
• Tidal energy offers a vast and reliable energy source
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4. • “Basically it's like putting a
windmill in the water”
said Bjorn Bekken, a
project manager for
Hammerfest Strom
• Or As it Is looking like a
wind mill & are installed
on the ocean floor and
large river bed , that
means these are under the
water.
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5. RENEWABLE SOURCES OF ENERGY
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•Solar Energy
•Tidal Energy
•Wind Energy
•Hydro Energy
•Geothermal Energy

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7. RENEWABLE ENERGY
• Major role in decreasing of emissions of the carbon
dioxide (CO2) into atmosphere.
• Increased proportion of renewable energy sources
enhances energetic viability of the energy system.
• Helps to enhance energy delivery security by decreasing
dependency on importing energetic raw materials and
electrical energy.
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8. UNDERWATER WINDMILL
• Underwater windmill – device that extracts power from the
tides.
• Tidal energy – vast and reliable energy source.
• Similar to wind energy technology, with the rotor blades
driven not by wind power but by tidal currents.
• The gravitational pull of the moon produces a swift tidal
current, which spins the long blades of the turbine
• produces electricity via different parts of underwater
windmill .
• This energy derived from the moon that now helps to power
a small arctic village.
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9. UNDERWATER WINDMILL
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10. MAIN PARTS
• Turbines
• Gearbox
• Generator
• Cables
• Support
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GEARBOX
 Speed control
 High gear ratios
 High torque out put
GENERATORS
 AC generators are commonly used
 Permanent magnet synchronous generator
field exited synchronous generator
 Induction generator

12. PRINCIPLE
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 Underwater turbines operates on the same principles that
wind turbines use
 A flow of fluid moves a set of blades creating mechanical
energy which is then converted to electrical energy

13. WORKING PRINCIPLE
• Underwater windmill consists number of blades mounted
on a hub (together known as the rotor), gearbox &
generator
• The hydrodynamic effect of the flowing water passing the
blades causes the rotor to rotate
• Thus turning the generator to which the rotor is
connected via a gearbox
• The gearbox convert the rotational speed of the rotor
shaft to the desired output speed of the generator shaft
• The electricity generated is transmitted to land through
cables 13

14. WORKING
• Underwater turbines works on tides to push water against
angled blades, causing them to spin
• Turbines can be placed in natural bodies of water, such as
harbors and lagoons
• These turbines must be able to turn 180 degrees to
accommodate the ebb and flow of tides(demonstrated by
the seagen prototype turbine –ireland )
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• As the blades spin, a gearbox turns an induction genarator, which
produces an electric current
• This design allows the face of the turbine to face the direction of
the current
• Todays Underwater turbines– they all operate like underwater
windmills, with their blades turning at right angles to the flow of
the water.
• The oxford team's – built around a cylindrical rotor, which rolls
around its long axis as the tide ebbs and flows
• As a result, it can use more of the incoming water than a standard
underwater windmill

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17. MAINTENANCE
• Maintenance of the device while it is submerged in fast
currents would be exceptionally challenging and expensive
• The rotor and drive train (i.e. gearbox and generator) can be
raised completely above the surface
• Once raised, any maintenance or repairs can readily be
carried out from the structure attended by a surface vessel
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19. ADVANTAGES
• No fuel cost
• Tidal power –emission free source of power
• Completely renewable
• Produces no emissions
• Hidden beneath the water.
• Energy output is 100% reliable, as tides are sure
of the moons. 19

20. DISADVANTAGES
• The initial cost is too high
• Very difficult to install
• The blade must be coated to avoid corrosion
• Special type of material have to be used for
blade
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21. CONCLUSION
• Tides and ocean current play important role in the
formation of global climate as well as eco system for ocean
habitats
• We believe that the intense and predictable marine current
resource offers the possibility of clean energy at a cost that
will ultimately be competitive not only with the other
renewable
• But in the long run we believe we can compete head on with
most forms of fossil fuelled power generation at present-day
costs
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22. REFERENCES
o www.ijmtes.com
o news.nationalgeographic.com/news
o www.google.com
o www.wikipedia.com
o www.studymafia.org
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