This document discusses tidal power, including what causes tides, how tidal power works, the components of a tidal power plant, and methods of operation. Tidal power harnesses the kinetic energy of tidal currents or potential energy of rising and falling tides. There are two main methods - barrages across estuaries that generate power as tides flow in and out, and tidal stream turbines that operate similar to wind turbines in moving water. Tidal power plants have dams, turbines, and generators and can utilize single or double basin systems in different tidal cycles. While tidal power is a renewable source with few emissions, barriers are very expensive and can impact local ecosystems.

1. TIDAL POWER

2. CONTENT
 Tide
 Tidal Force
 Tidal Power
 Principal of Tidal Power
 Components of Tidal Power plant
 Operation Method
 Advantages & Disadvantages
 Global Environment Impact

3. 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.

4. 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.

5. ABOUT TIDAL POWER
 Tidal power, sometimes called
tidal energy, is a form of
hydropower that exploits the
movement of water caused by
tidal currents or the rise and fall
in sea levels due to the tides.
 Although not yet widely used,
tidal power has potential for
future electricity generation and
is more predictable than wind
energy and solar power.

6. PRINCIPLE OF TIDAL POWER STATIONS
 1. Barrages make use of the potential energy from the difference in
height (or head) between high and low tides. . Barrages suffer fromthe
problems of very high civil infrastructure costs, few viable sites globally
and environmental issues.

7.  2. Tidal stream systems
make use of the kintetic
energy from the moving
water currents to power
turbines, in a similar way
to wind mills use moving
air. This method is gaining
in popularity because of
the lower cost and lower
ecological impact.

8.  Gates & Locks:-
Tidal power basins have to be filled and emptied gates are open
regularly and frequently, but heads are vary in highest and on the
sides where they occurs which is not the case with the conventional
river projects.The gates must be opened and closed rapidly and this
operation should use a power.
 Power House:-
Because small heads only available large size turbine are
hence power house is also large structure. Both the French and
soviet operating use the bulb type of turbine the propeller type with
the reversible blades.
CONT……
COMPONENTS OF
TIDAL POWER PLANT

9.  The Bulb Group:-
A bulb type turbine is example of flow turbine. The bulb set
resembling in appearance a small submarine is made up of an ague
shape steel contains a horizontal duct in which alternator and a
Kaplan turbine is placed and entirely surrounding by water.
 Rim Type Turbine:-
Different types of turbine are under study usually mention are
include shaft turbine rim type turbine or straight flow turbine where
the gear is attached on the turbine blade arrangement that couples
two turbine of conventional type to one generator and a hydraulic
system in which six turbine are to hydrostatic pumps. The main
problems in rim type turbine in which the rotor surrounded the turbine
the runner and rim.

10. OPERATION METHOD OF
UTILIZATION OF TIDAL ENERGY
 Electricity generation requires certain
heads difference of water flow. The concept
have been advised for operation hydraulic
turbine.
I.
II.
Single basin system
Double basin system

11. I. SINGLE BASIN SYSTEM
 In this system there is only one interaction with the
sequence. The two are separated by dam and flow
between through sluice valves. The generation of
power is by……..
Single ebb cycle system
Single tide cycle system
Double cycle system

12. SINGLE EBB CYCLE SYSTEM:-
When the flood tide comes in the sluice gates are open to
permit sea water to enter the basin or reservoir, while turbine
seas are shut. At the start of ebb tide and the sluice gatesare
closed. The generation of power takes place when the sea is
ebbing and the water from basin flows over there sufficient
difference between reservoir and falling tide.
SINGLE TIDE SYSTEM
Here generation is affected when sea is at flood tide.The
water of sea is admitted into the basin over turbine. As the
flood period is over and the sea level is slopping, the basin is
drained into the sea through side ways. The main
disadvantage is in the both the ebb and tide cycle system is
intermittent occurs at regular interval. There is possibility of
connection another system such possibility can regulate
operation of the system for both ebb and flood tides with
single basin..
cont……

13. DOUBLE CYCLE SYSTEM:-
The power generation is affected when sea is at flood
tide. The direction through turbine during the ebb and the
flood tides alternate but the machine acts as a turbine for
either direction of flow.
In this system the power is accomplished during both
emptying process takes place during short period of time.The
filling of ocean is high while at low tide emptying occurs. The
flow of water in both directions is used to drive a no of water
turbine each driving an electric generator. Electric power is
generated once in every six hours 12.5 min.

14. II. DOUBLE BASIN SYSTEM

 Here the turbine is located two adjacent basin, while the
sluice gates are usual embodied in the dam across the
month of two estuaries. At the beginning of the flood tidethe
turbine are shut down. Basin A fills and B remains empty.As
soon as the head difference of A and B is large enough the
water is flow from A to B and turbinestarts.
The separation can be control to make to continuous
operation from upper to lower basin. However since water
head between basin varies during each tidal cycle. As well
as day so also power generation to improve situation in use
off peak power from tidal generator or from alternate system
to pump water from low to high basin, and increased head is
available from tidal power at peak times.

15. ADVANTAGES OF USING TIDAL POWER:
 Predictable source of “green" energy during
lifetime of barrage
 It produces no greenhouse gases or other waste; it
needs no fuel.
 Not expensive to maintain.
 Tidal energy has an efficiency of 80% in converting
the potential energy of the water into electricity
 Vertical-axis tidal generators may be joined
together in series to create a ‘tidal fence’ capable of
generating electricity on a scale comparable to the
largest existing fossil fuel based, hydroelectric and
nuclear energy generation facilities

16. DISADVANTAGES OF USING TIDAL
POWER:
 A barrage across an estuary is very
expensive to build, and affects a very wide
area - the environment is changed for many
miles upstream and downstream
 it provides power for around 10 hours each
day, when the tide is actually moving in or
out, which is not very much
 Existing ecosystems would be heavily
altered, with new species moving in and
perhaps dominating old species
 Tidal power schemes have a high capital
cost

17.  A tidal power scheme is a long-term source of
electricity. A proposal for the Severn Barrage, if
built, has been projected to save 18 million
tonnes of coal per year of operation. This
decreases the output of greenhouse gases into
the atmosphere.
 If fossil fuel resource is likely to decline during
the 21st century, as predicted by Hubbert peak
theory, tidal power is one of the alternative
source of energy that will need to be developed
to satisfy the human demand for energy.
GLOBAL ENVIROMENTAL IMPACT

18. THANK YOU