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Sachin Th orat

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.

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 & areinstalled on the ocean floor and large river bed , that means these are under

the water.

A SEMINAR ON UNDER WATER WINDMILL-PPT

FULL DOWNLOAD

INTRODUCTION TO UNDERWATER

WINDMILL

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PRINCIPLE OF OPERATION

TYPES :

There are two types of underwater windmill

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.1

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.

2

The gearbox is used to convert the rotational speed of the rotor shaft to the

desired output speed of the generator shaft.3

The electricity generated is transmitted to land through cables.4

Fig. Underwater Windmill

http://3.bp.blogspot.com/-VFGU5PDUrzE/VPFm115oQzI/AAAAAAAAAlY/p54IeT3GpaY/s1600/underwater%2Bwindmill%2Bseminar%2Breport.jpg





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.

ABOUT TURBINES…

WORKING…

Advantages:

The advantages of under water windmill is much more than the

disadvantages:-

Uses Tidal energy ,which is a clean and renewable source of

orizontal axis1

Vertical axis2

The turbines can convert kinetic hydro energy into power ranging from 25

kW to 250 kW, depending on turbine size and current.1

Kinetic energy is converted to mechanical power in a nacelle within the

turbine.2

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.





energy

Have lesser impact on the environment

Low running cost

Long lifetime with little maintenance

Reduces the dependence upon fossil fuels

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.

Download: UNDER WATER WINDMILL.pptx

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