1. Group-2
1. Rahman, Md. Mahmudur 11-18369-1
2. Asad, Md. Hasib Ul 11-19431-2
3. Saha, Avijit 12-20448-1
4. Ahmed, Sakib 12-21388-2
5. Mahmud, Ibnan 12-21386-2

2.  Tides

3.  Tides

4.  Tidal energy is a form of hydropower that converts the
energy of the tides into electricity or other useful forms of
power.
 Tidal Energy Power Plant

5.  100% renewable
 More efficient than Wind Energy
 Unlike wind, tides are more predictable
 Tidal Energy supplies a steady, reliable stream of electricity
 Tidal energy production is still in infancy
 Production is very small
 Not Cost efficient
 Not Eco-friendly

6.  The concept of harvesting Tidal Energy is close to that of Wind
Mill Technology.
 Tidal Stream Turbines are placed well below the shipping channel
 These turbines feature a rotor section that ranges from 15-100
meters in diameter with a gravity base which is generally slightly
larger than the rotor to support the structure

8.  Bulb turbines are connected to the generator-motor unit in the flow passage of
the water. The main drawback is that water flows around the turbine, which
makes the maintenance work difficult. Full turbine unit has to be lifted above
the water to do the maintenance
 Rim turbines reduce these problems as the generator is mounted in the
barrage, at right angles to the turbine blades. Unfortunately, it is
difficult to regulate the performance of these turbines

9.  Tubular turbines have been proposed for use some UK projects. In this
configuration, the blades are connected to a long shaft and orientated at
an angle so that the generator is sitting on top of the barrage.

10. There are three methods of harvesting Tidal
Energy
• Tidal Barrage System
• Tidal Lagoon System
• Tidal Stream System

11.  A barrage, or a dam is built across an estuary, creating a
Tidal Basin
 There are two sluice gates; one is between the sea and
the barrage& another one is between the barrage and the
Basin
 The Turbine unit is placed between those two sluice gates

12.  When the sea is at High Tide, the sluice gates opened to fill
the basin
 When the water reaches High Water Mark, the gates are
closed.
 During the low tide, the gates are opened again to flow the
water towards the sea.
 This rotates the turbine and generates electricity

13.  In some cases, Double-effect Turbines are used
 During high-tide, the sluice gates are opened, water rush
into the Basin.
 This rotates the turbine and generates electricity
 The gates are closed when the water level on both side of
the barrage is equal
 When the sea is at Low-tide level, Sluice Gates are opened
again.
 The water then rushes back to sea. This rotates the turbine
again and generates electricity for the second time.

14.  A tidal lagoon is a man-made or natural breakwater wall in
the sea that generates power from the motion of the tides.
 The deepest part of the wall houses a number of hydro-
turbines
 The flow of water past the blades is managed by sluice
gates. When the flood tide starts to come in, the sluice gates
are closed and the sea outside the wall is held back and rises
around the lagoon. This creates a difference in water levels
on either side of the seawall, which is known as ‘head’. Once
a sufficient head height is reached the sluice gates are
opened and water flows through turbines into the lagoon to
generate electricity.

15.  The sluice gates are then closed and this process occurs in reverse on
the ebb tide: the water is held back inside the lagoon, creating a
head height relative to the receding tide in the Bay. The sluices are
then opened, releasing the lagoon waters through the turbines back
into the Bay. This rotates the turbine in the opposite direction and
generates electricity for the second time.
 In UK, China has proposed to build World’s First Tidal Lagoon Power
Plant at Swansea Bay.

16.  Turbines are placed under water and the generator is placed
in the holding tower above the water
 Sea-water rotates the turbine
 The turbines can rotate in both directions
 This system has minimum effect on sea environment

17. La Rance Tidal Power Plant,
France
Year-1966
Capacity-240MW
Type-Barrage
Sihwa Lake Tidal Power Station
South Korea
Year-2011
Capacity-254MW
Type-Barrage

18. SeaGen, Northern Ireland
Year-2008
Capacity-1.2MW
Type-Tidal Stream Generator System
Gujrat Tidal Power Plant, India
Year-
Capacity-50MW
Type- Offshore Tidal Turbine

19.  Renewable resource
 No Fuel is needed to run the power plant
 Production is more predictable
 Very effective at low speed of the medium
 Longer life-span
 Tidal Barrage can be used as a bridge and a dam
to prevent flood

20.  High Production cost (Tidal Energy cost$400 per MWH
where other Renewable Energy Resources cost $150 per
MWH)
 Very High Establishment Cost
 Machineries are very expensive and setting up those
machines is costly and risky.
 Turbines are subjected to corrosion
 Harmful to Marine life and the eco-system of the
surrounding areas
 Areas surrounding to Tidal Energy Power Plant suffer from
siltation

21.  Network of Off-shore Tidal Turbines
 Usage of Natural Tidal Lagoons
 Improved Designs of Tidal Turbines

22.  AENews, (2015). Tidal Power. [online] Available at: http://www.alternative-energy-
news.info/technology/hydro/tidal-power/ [Accessed 11 Oct. 2015].
 Engineeringcivil.com, (2015). Tidal Energy Harvesting. [online] Available at:
http://www.engineeringcivil.com/tidal-energy-harvesting.html [Accessed 24 Oct. 2015].
 Society, N. and Society, N. (2011). tidal energy. [online] National Geographic Education.
Available at: http://education.nationalgeographic.com/encyclopedia/tidal-energy/
[Accessed 16 Oct. 2015].
 Bbc.co.uk, (2015). BBC - GCSE Bitesize: Renewable energy sources. [online] Available at:
http://www.bbc.co.uk/schools/gcsebitesize/geography/energy_resources/energy_rev2.sh
tml [Accessed 15 Oct. 2015].
 Lombardo, C. (2015). The Advantages and Disadvantages of Tidal Energy Power | Samsung
Galaxy Blog. [online] Thenextgalaxy.com. Available at: http://thenextgalaxy.com/the-
advantages-and-disadvantages-of-tidal-energy-power/ [Accessed 15 Oct. 2015].
 Mnre.gov.in, (2015). Ministry of New and Renewable Energy - Ocean Energy. [online]
Available at: http://mnre.gov.in/schemes/new-technologies/tidal-energy/ [Accessed 15
Oct. 2015].
 Study.com, (2015). Tidal Energy: Advantages and Disadvantages - Video & Lesson
Transcript | Study.com. [online] Available at: http://study.com/academy/lesson/tidal-
energy-advantages-and-disadvantages.html [Accessed 15 Oct. 2015].
 Us, A., Maehlum, M. and Mæhlum, M. (2012). Tidal Energy Pros and Cons - Energy
Informative. [online] Energy Informative. Available at:
http://energyinformative.org/tidal-energy-pros-and-cons/ [Accessed 15 Oct. 2015].