Under-Water Windmill is a Concept of Converting and Utilization of Free Ocean Water Energy into Electrical Energy

1. Presented by:
CHETHAN KUMAR
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: 2
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.

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