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1. A
SEMINAR ON
UNDER WATER WINDMILL
Presented by:
Rajesh Kumar Sahu
Regd No:090101MER020
Mechanical Engineering

2. CONTENTS
Introduction
Main parts
Working principle
Types
Advantages
Disadvantages
Global resources
Conclusion
References

3. INTRODUCTION
 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 different parts of
underwater windmill . This Energy derived from the moon that
now helps to power a small arctic village.

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
SeaGen Technology :-

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 through cables.

9. TYPES :
There are two types of underwater windmill
1. Horizontal axis
2. Vertical axis
 In horizontal axis underwater windmill , the
rotor shaft is parallel to the direction of the
flow of water.
In vertical axis underwater windmill , the rotor
shaft is perpendicular to the direction of the flow
of water.

11. ABOUT TURBINES…
The turbines can convert kinetic hydro energy
into power ranging from 25 kW to 250 kW,
depending on turbine size and current.
Kinetic energy is converted to mechanical
power in a nacelle within the turbine.

12. WORKING…
 Underwater ( tidal) turbines are a fairly straightforward
concept, as far as cutting-edge energy technology goes.
 They are essentially windmills installed onto an ocean
floor or river bed.
 The underwater 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.
 Once it's plugged into an electrical grid, the electricity can
be distributed.

13. SPECIALIZATION
How it is special from others like,
1.Watermill
2.Windmill
Lets Know………

14. WATERMILL
A watermill is a structure that uses a water wheel
or turbine to drive a mechanical process such as
flour, lumber or textile production, or metal
shaping (rolling, grinding or wire drawing).
 There are two basic types of watermill, one
powered by a vertical waterwheel via a gearing
mechanism, and the other equipped with a
horizontal waterwheel without such a
mechanism.
The former type can be further divided,
depending on where the water hits the wheel
paddles, into undershot, overshot, breastshot
and reverse shot waterwheel mills.

15. View:
Watermill of Braine-le-Château, Belgium (12th century)

16. CONCEPTICAL DIAGRAMS
Undershot water wheel, applied for
watermilling since the 1st century BC
Overshot water wheel, applied for
watermilling since the 1st century BC
Breastshot water wheel, applied for
watermilling since the 3rd century AD

17. WIND MILL

18. ADVANTAGES:
The advantages of under water windmill is much
more than the disadvantages:-
 Uses Tidal energy ,which is a clean and renewable
source of energy
 Have lesser impact on the environment
 Low running cost
 Long lifetime with little maintenance
 Reduces the dependence upon fossil fuels

19. DISADVANTAGES:
 The initial cost is too high
 Very difficult to install
 The blade must be coated to avoid corrosion
 Special type material must have to be used for blade

20. GLOBAL RESOURCES
It is widely agreed that, tidal stream energy capacity could
exceed 120GW globally .
The UK has one of the largest marine energy resources in the
world.

21. CONCLUSION
 Tides play a very important role in the formation of global climate as well as the
ecosystems for ocean habitants. At the same time, tides are a substantial
potential source of clean renewable energy for future human generations.
Depleting oil reserves, the emission of greenhouse gases by burning coal, oil and
other fossil fuels, as well as the accumulation of nuclear waste from nuclear
reactors will inevitably force people to replace most of our traditional energy
sources with renewable energy in the future . Tidal energy is one of the best
candidates for this approaching revolution. Development of new, efficient, low-
cost and environmentally friendly hydraulic energy converters suited to free-
flow waters. This type of machine, moreover ,can be used not only for multi-
megawatt tidal power farms but also for mini-power stations with turbines
generating a few kilowatts. Such power stations can provide clean energy to
small communities or even individual households located near continental
shorelines, straits or on remote islands with strong tidal currents.

22. REFERENCES
 http://www.marineturbines.com/
 http://www.renewable-solarenergy.com/tidal-energy-
power.html
 International Energy Agency, World Energy Outlook 2007.
 Prandle, D., Simple theory for designing tidal power schemes,
Advances in Water Resources, 1984.
 Sheth, S. and M. Shahidehpour, Tidal Energy in Electric Power
Systems, in Power Engineering Society General Meeting, 2005.
 http://www.tidalenergyltd.com/technology.htm