This document discusses underwater windmills, which extract tidal power from ocean currents in a similar way that wind turbines extract wind power. It describes the main parts of underwater windmills including turbines, gearboxes, generators, and support structures. Underwater windmills operate by using the flow of water past their blades to rotate the turbine and generator to produce electricity. While the initial costs are high, underwater windmills provide renewable energy with no emissions and have potential to be cost competitive with fossil fuels in the long run. The document also notes specific tidal farm projects planned off the coast of India.

1. www.studymafia.org
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Seminar
On
Underwater Windmill

2. CONTENT
 WHAT IS IT ???
 NAME JUSTIFICATION
 MAIN PARTS
 PRINCIPLE OF OPERATION
 IMPLIMENTATION
 ADVANTAGES
 DISADVANTAGES
 GLOBAL RESOURCES
 CONCLUSION
 REFERENCES

3. What is it ???
 An Underwater windmill like a device that extracts
power from the tides. Renewable energy
technologies are becoming an increasingly
favourable alternative to conventional energy
sources to assuage fossil fuel related issues. Tidal
energy offers a vast and reliable energy source.
 This technology is 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 . Which in turn produces electricity via

4. NAME JUSTIFICATION
 Why it is called as “underwater windmill” ?
 "Basically it's like putting a windmill in the water,"
said Bjorn Bekken, a project manager for
Hammerfest Strom.
 Or as it’s looking like a wind mill & are installed
on the ocean floor and large river bed , that
means these are under the water.

5. VIEWS:1

6. VIEWS:2

7. MAIN PARTS
 Turbines
 Gearbox
 Generator
 Cables
 support

8. PRINCIPLE OF OPERATION
 In simple a underwater windmill consists of a
number of blades mounted on a hub (together
known as the rotor), a gearbox, and a generator.
 The hydrodynamic effect of the flowing water
past the
blades causes the rotor to rotate, thus turning the
generator to which the rotor is connected via a
gearbox.
 The gearbox is used to convert the rotational
speed of the rotor shaft to the desired output
speed of the generator shaft.
 The electricity generated is transmitted to land

9. IMPLIMENTATION
 The company Atlantis Resources is to install a
50MW tidal farm in the Gulf of Kutch on India's west
coast, with construction starting early in 2012.The
facility could be expanded to deliver more than
200MW.
 Projections indicate that the cost of the initial 50MW
farm - to consist of 501MW turbines - will come in at
about $150m.
 The current timescale has the project's final
engineering plans completed by the end of this Year
2013.

10. ADVANTAGES
 Tidal energy is completely renewable.
 Tidal energy produces no emissions.
 Hidden beneath the water.
 Have lesser impact on the environment
 Low running cost
 Long lifetime with little maintenance
 Reduces the dependence upon fossil fuels

11. DISADVANTAGES
 The initial cost is too high
 Very difficult to install
 The blade must be coated to avoid corrosion
 Damages habitat up to 500km away

12. GLOBAL RESOURCES

13. Conclusion
 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
renewables, but in the long run we believe
we can compete head on with most forms of
fossil fuelled power generation at present-
day costs.

14. REFERENCES
 www.google.com
 www.wikipedia.com
 www.studymafia.org
 www.pptplanet.com

15. Thanks