The seminar discusses underwater windmills, devices that harness tidal energy to generate electricity, which is a renewable alternative to fossil fuels. It details the main components, types, working principles, advantages, and disadvantages of this technology, highlighting its potential for clean energy generation. The conclusion emphasizes the competitiveness of tidal energy against conventional energy sources and its low environmental impact.

1. 2/05/2019 SEMINAR 1
NET’s
NAVODAYA INSTITUTE OF TECHNOLOGY, RAICHUR
DEPARTMENT OF CIVIL ENGINEERING
A SEMINAR ON
UNDERWATER WINDMILLS
Under the supervision of
Mr. Maheshwar S M
Assistant professor
Department of civil engineering
NIT-Raichur
Presented by
Mohammad Yaseen 3NA16CV427

2. CONTENTS
 Introduction
 Main parts
 Working principle
 Types
 Advantages
 Disadvantages
 Global resources
 Conclusion
 References
2/05/2019 2SEMINAR

3. INTRODUCTION
 An Underwater windmill like a device that extracts power
from the tides.
 Renewable energy technologies are becoming an
increasingly favorable 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 .
2/05/2019 3SEMINAR

4. INTRODUCTION (cont…)
2/05/2019 4SEMINAR

5. MAIN PARTS
 Turbines
 Gearbox
 Generator
 Cables
 support
2/05/2019 5SEMINAR

6. TYPES
There are two types of underwater windmill
1. Horizontal axis
2. Vertical axis
 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
2/05/2019 6SEMINAR

7. TYPES(cont…)
2/05/2019 7SEMINAR

8. PRINCIPLE OF OPERATION
 An underwater windmill consists of a rotor, gearbox,
and a generator .
 Water flows => Rotor rotates => turn ON generator .
 The gearbox is used to convert the rotational speed
of the rotor shaft to the desired output speed of the
generator shaft.
 The electricity generated is transmitted to land
through cables .
 The turbines can convert kinetic hydro energy into
power .
2/05/2019 8SEMINAR

9. WORKING
 They are essentially windmills installed onto an
ocean floor or river bed
 The under water 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 is plugged into an electrical grid, the
electricity can be disturbed
2/05/2019 9SEMINAR

10. WORKING(cont…)
2/05/2019 10SEMINAR

11. ABOUT TURBINES
 The turbines can convert kinetic hydro energy into
power ranging from 25 kW to 250 kW, depending on
turbine size and current.
 Kinetic energy is converted to mechanical power
within the turbine.
2/05/2019 11SEMINAR

12. ADVANTAGES
 Tidal and ocean current is completely renewable.
 Tidal and ocean current produces no emissions.
 Hidden beneath the water.
 Have lesser impact on the environment .
 Low running cost .
 Long lifetime with little maintenance .
 Reduces the dependence upon fossil fuels .
2/05/2019 12SEMINAR

13. DISADVANTAGES
 The initial cost is too high
 Very difficult to install
 The blade must be coated to avoid corrosion
 Damages habitat up to 500km away
2/05/2019 13SEMINAR

14. CONCLUSION
 Tides and ocean current play is very important role
in the formation of global climate as well as eco
system for ocean habitats
 We believe that the intense and predictable marine
current resource offers the possibility of clean energy
at a cost that will ultimately be competitive not only
with the other renewable
 But in the long run we believe we can compete head
on with most forms of fossil fuelled power generation
at present-day costs
2/05/2019 14SEMINAR

15. REFERENCES
 http://www.marineturbines.com/
 http://www.renewable-solarenergy.com/tidal-
energypower. html
 International Energy Agency, World Energy Outlook
2007.
 Prandle, D., Simple theory for designing tidal power
schemes, Advances in Water Resources, 1984.
 Sheth, S. and M. Shahidehpour, Tidal Energy in
Electric Power Systems, in Power Engineering
Society General Meeting, 2005.
 http://www.tidalenergyltd.com/technology.htm
2/05/2019 15SEMINAR