The document discusses an underwater windmill, which extracts power from tides. It has main parts including turbines, a gearbox, and generator. The turbines are installed on the ocean floor and convert kinetic tidal energy into electricity. As the tides cause water to flow, it makes the turbine rotor spin, which turns the generator via the gearbox to produce electricity. The electricity is transmitted via cables to land. While high initial costs and difficulty of installation are disadvantages, underwater windmills have benefits of being renewable, emissions-free, and having low maintenance costs.

1. Submitted By:
DJ
SEMINAR
ON
UNDERWATER WINDMILL

2. CONTENT
 INTRODUCTION
 NAME JUSTIFICATION
 MAIN PARTS
 PRINCIPLE OF OPERATION
 BLOCK DIAGRAM
 WORKING
 ADVANTAGES
 DISADVANTAGES
 CONCLUSION

3. INTRODUCTION
 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 different parts of
underwater windmill .

4. NAME JUSTIFICATION
 Why it is called as “underwater windmill” ?
 "Basically it's like putting a windmill in the
water," -Bjorn Bekken
 Or as it’s looking like a wind mill & are
installed on the ocean floor and large river
bed

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

6. PRINCIPLE OF OPERATION
 an underwater windmill consists of a rotor, gearbox,
and a generator
 Water flows => Rotor rotates => turn ON generator
 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 through
cables
 The turbines can convert kinetic hydro energy into
power

7. Block Diagram

8. WORKING
 Under water turbines are a fairly straight forward
concept, as far as cutting edge energy technology goes
 They are essentially windmills installed onto an ocean
floor or river bed
 The under water current produced by the tides spins
blades arranged like an airplane propeller
 These turbines are attached to a gear box, which is
connected to an electrical generator
 This produces the electricity that is carried by cable to
shore

9.  Once it is plugged into an electrical grid, the
electricity can be disturbed

10. Schematic diagram of Under water floating wind mill

11. ADVANTAGES
 Tidal and ocean current is completely
renewable.
 Tidal and ocean current 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

12. 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

13. Conclusion
 Tides and ocean current play is very 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

14. THANK YOU