Tidalpower and its future scope

USAGE OF TIDAL ENERGYA.MANOJ CHOWDARY

AM.EN.U4EEE12001

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Index• Introduction

• Tides

• Tidal power

• How it works

• Types of tidal plants

• Generation using various methods.

• Advantages and Disadvantages of Tidal Power

• Currents sites of tidal power plants

• Future scope

• conclusion

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IntroductionTidal power, also called tidal energy, is a form of hydropower that

converts the energy of tides into useful forms of power - mainly

electricity. This is the only form of energy whose source is the

moon.

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WHAT IS A TIDE ?

• Tides are the rising and falling of Earth's ocean surface

caused by the tidal forces of the Moon and the Sun

acting on the oceans

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What is the Tidal force ?

The tidal force is the

vectorial difference between

the gravitational force of the

Earth and the gravitational

force of the Moon.

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THE HIGH TIDE THE LOW TIDE

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Tidal Power

Tidal power is generated by a turbine under water that

spins making the mechanical energy to electrical

through a generator that send the electrical energy to

the shore.

Tidal power has potential for future electricity

generation and is more predictable than wind energy

and solar power

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Types of tidal plants

Tidal Barrage Tidal stream generator

Are Typically dams, built across on estuary

of bay

Make use of the kinetic

energy of moving water to

power turbines in a

similar way to wind

turbines that use wind to

power turbines

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TIDAL BARRAGE

• Barrages make use of the potential energy from the difference

in height (or head) between high and low tides. Barrages suffer

from the problems of very high civil infrastructure costs, few

viable sites globally and environmental issues.

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WORKING OF TIDAL BARRAGE

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CATEGORIES OF GENRATION

• EBB GENERATION

• FLOOD GENERATION

• PUMPING

• TWO BASIN SCHEMES

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The potential energy contained in a volume

of water is given by:

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• E = 1

2𝐴𝑝𝑔ℎ2

• A is the horizontal area of basin

• p is the density of water

• h is the vertical tidal range

• g is the acceleration due to gravity

ADVANTAGES OF TIDAL BARRAGE

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LIST OF TIDAL BARRAGES

• Le Rance Tidal Barrage-240MW

• Uldolmok Tidal Barrage-90MW

• Tees Barrage-80MW

• Annapolis Royal Tidal Barrage-20MW

• Jiangxia TidalBarrage-3.2MW

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Tidal Barrage

The Rance tidal barrage in

North-West France is the

largest in the world

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TIDAL STREAM GENERATOR

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A tidal stream generator is a

machine that extracts energy

from moving masses of water,

or tides. These machines

function very much like

underwater wind turbines, and

are sometimes referred to as

tidal turbines. Tidal stream

generators are the cheapest and

the least ecologically

damaging.

TYPES OF TIDAL STREAM GENRATORS

Axial turbines

Cross flow turbines

Flow augmented turbines

Oscillating devices

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Tidal current turbines

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ENERGY CALCULATION :

P = ŋ𝑝𝐴𝑉3

2• p is the density of water

• A is the sweep area of the turbine

• V is the velocity of flow

• P is the power generated in watts

• Ŋ is the efficiency of the turbine.

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ADVANTGES OF TIDAL STREAM GENERATOR

Low Noise Pollution

Sound levels transmitted are very low

High Predictability

Tides predicted years in advance, unlike wind

High Power Density

Much smaller turbines than wind turbines for the

same power

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Current sites of tidal power plantsStation Capacity

(MW)

Country

Sihwa Lake Tidal Power

Station

254 South Korea

Rance Tidal Power Station 240 France

Annapolis Royal Generating

Station

20 Canada

Jiangxia Tidal Power Station 3.2 China

Kislaya Guba Tidal Power

Station

1.7 Russia

Uldolmok Tidal Power

Station

1.5 South Korea

Strangford Lough SeaGen

Sundaraban area

1.2

40

United Kingdom

india

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ADVANTAGES

1. It is a renewable source of energy.

2. Tidal energy is environment friendly energy and

doesn't produce greenhouse gases.

3.Because 71% of Earth’s surface is covered by water,

it is possible to generate this energy on a large scale.

4.Efficiency of tidal power is far greater as compared to

coal, solar or wind energy. Its efficiency is around 80%.

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1.Cost of construction of tidal power plant is high.

2.Intensity of sea waves is unpredictable and there

can be damage to power generation units.

3. Influences aquatic life adversely and can disrupt

migration of fish.

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FUTURE SCOPE:

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INDIA SCOPE TOWARDS TIDAL ENERGY :

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In Jan 2011, the state of

Gujarat announced plans to

install Asia’s first commercial-

scale tidal current power

plant; the state government

approved the construction of a

50 MW project in the Gulf of

Kutch

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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,

nuclear waste 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

References

• Wikipedia.org

• Slideshare.com

• Alternative-energy-news.info

• Google.com

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QUESTIONS ??

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THANK YOU

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