This PPT was made for Seminar course on 25 November, 2021 and is being uploaded on SlideShare at 12:26 AM on 29 November, 2021

1. Government Polytechnic, Aurangabad
An Autonomous Institute of Government of Maharashtra
शासकीय तंत्रनिके ति, औरंगाबाद
(महाराष्ट्र शासनाची स्वायत्त संस्था)
Seminar
Underwater Windmill
PRESENTED BY,
SANKET DATTU SONAWANE (193350)
GUIDED BY,
DR. SWATI BHASME
(HOD Of Electrical Department and Vice Principal)
DEPARTMENT OF ELECTRICAL ENGINEERING SECOND SHIFT
ACADEMIC YEAR 2021-22

2. • Introduction
• A short history review of Underwater Windmill
• Construction
• Types of Underwater Windmill
• Working
• Advantages
• Disadvantages
• Conclusion
• Future scope of Underwater Windmill
• References
INDEX

3. • Tidal stream turbines are often described as underwater windmill. They are
driven by the kinetic energy of moving water in a similar way that wind turbines
use moving air.
• 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.
INTRODUCTION

4. • Water is about 800 times denser than air.
It means that a single underwater
windmill can provide significant power
at low tidal flow velocities compared
with similar wind speed.
• The potential for power generation by an
individual tidal turbine can be greater
than that of similarly rated wind energy
turbine.

5. HISTORY
• The first windmill used to produce electrical energy was created in 1888 by
Charles F Brush. It was a terrestrial windmill.
• Later on, underwater windmill were first conceived in the 1970s during the
oil crisis.
• The process of using falling water and spinning turbines to create
electricity was introduced in the U.S. And Europe in the 19th century.
• The first fully developed Underwater Windmill was establised in UK on
17th June, 2003.

6. CONSTRUCTION
Construction of underwater windmill is almost
same as of terrestrial windmill and consists of
main parts that are given as follows :
• Turbines
• Gearbox
• Generator
• Cables
• Support

7. BLOCK DIAGRAM OF UNDERWATER
WINDMILL

8. CONSTRUCTION
• Underwater windmill includes a number of blades that are arranged on a hub,
a generator & a gearbox.
• As with wind power, selection of location is critical for the underwater
windmill. Underwater windmill need to be located in areas with fast currents
where natural flows are concentrated between obstructions, for example at the
entrances to bays and rivers, around rocky points, headlands, or between
islands or other land masses.

9. TYPES OF UNDERWATER WINDMILL
There are 2 types of Underwater Windmill based on
position/axis of turbines. They are as follows :
1. Vertical Axis Underwater Windmill
2. Horizontal Axis Underwater Windmill
Vertical Axis Underwater Windmill Horizontal Axis Underwater Windmill

10. WORKING
• Underwater turbines operate on the same principle that
wind turbines use; a flow of fluid moves a set of blades
creating mechanical energy which is then converted to
electrical energy.
• When water flows due to hydrodynamic effect of water,
the rotor rotates to make the generator turned ON. The
gearbox is used to change the rotary speed of the rotor
shaft to the preferred output speed of the shaft of the
generator.
• The generated electricity can be transmitted toward the
land through the cables. The turbines can change kinetic
hydro energy into power.

11. KINETIC ENERGY
Water
MECHANICAL
ENERGY
Turbine
ELECTRICAL
ENERGY
Generator
Main Principle used in Underwater Windmill for electricity generation

12. Working of Underwater Windmill

13. ADVANTAGES
• Tidal energy is completely renewable.
• Tidal energy produces no emissions.
• It’s running cost is low.
• It has a long lifetime and requires little maintenance.
• Energy output is a 100 ℅ reliable , as tides are as sure as the moon.
• Tidal energy reduces dependency on oil reserves from other countries.
• Its predictability makes it easy to integrate into existing power grids.

14. DISADVANTAGES
• It’s initial cost is too high.
• Off shore turbines cost more money than land / wind based turbines.
• They are also more expensive to maintain as they function under water.
• Fishing has to be restricted in the areas of the power plant.
• Damages habitat up to 500km away.

15. CONCLUSION
Tides are substantial sources of clean renewable energy for the future human
generation. Depilating oil reserves, the emission of greenhouse gases by burning
coal, oil and other fossil fuels will inevitably force people to replace energy in the
future. Tidal energy is one of the best candidates for this approaching revolution.
Tidal energy does not seem to be a big sustainable resource as compared to other
renewable energies such as wind and solar energy, yet it is doing a fast rate progress
in recent decades.

16. FUTURE SCOPE
• As the Non-renewable sources of energy are near their depletion, some
countries (especially countries near aquatic bodies) might shift their electricity
generation towards Underwater Windmill.
• There’s a large scope of Underwater Windmill in North American and
European countries.
• Especially, in Scotland 1/3rd of its total electricity demand is generated through
Underwater Windmill or Tidal Stream Generator.
• Some other countries like UK and Netherland are also having such Underwater
Windmill plants.

17. REFERENCES
• http://www.123seminarsonly.com/EC/Underwater-Windmill.html
• https://www.slideshare.net/lj7252/underwater-windmill-105688624
• https://www.academia.edu/40182559/A_Seminar_report_Underwater
_Windmill
• https://www.elprocus.com/underwater-windmill/
• https://en.m.wikipedia.org/wiki/Tidal_stream_generator