This document discusses underwater windmills, also known as tidal turbines. It begins by introducing renewable energy sources and different types of ocean energy technologies. Underwater windmills harness the kinetic energy of tides by placing turbines on the ocean floor that spin to generate electricity as tidal currents pass through. The document describes the basic parts and working principle of underwater windmills. It discusses the history of using wind power to generate electricity and highlights advantages like being renewable and having low environmental impact, while disadvantages include high initial costs and difficulty of installation.

1. BIRU WAGHAMODE
3NA14EE004
Navodaya Institute Of Technology, Raichur 1

2. CONTENT
 RENEWABLE ENERGY
 TECHNOLOGY
 NAME JUSTIFICATION
 UNDERWATER WINDMILL
 HISTORY
 MAIN PARTS
 PRINCIPLE OF OPERATION
 WORKING
 TYPES OF UNDERWATER
WINDMILL
 ADVANTEGES
 DISADVANTAGES
 CONCLUSION
 REFERENCES
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3. RENEWABLE ENERGY
 Renewable energy sources have major role in decreasing of
emission of the carbon dioxide(CO2) into atmosphere.
 Renewable energy is energy which comes from natural
resources such as sunlight, wind, rain, tides, and geothermal
heat, which are renewable (naturally replenished)
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4. RENEWABLE SOURCES OF ENERGY
 SOLAR ENERGY
 TIDAL ENERGY
 WIND ENERGY
 HYDRO ENERGY
 GEOTHERMAL ENERGY
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5. TECHNOLOGY
Ocean energy refers to a range of technologies that utilize the ocean
 Wave Energy Converters
 Tidal/Current
 Ocean Thermal Energy Conversion(OTEC)
 Offshore Wind
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6. NAME JUSTIFICATION
 Why it is called
as “underwater windmill”?
 “Basically it’s like
putting a windmill in the water,”
 Or as it’s looking like
a wind mill & are installed
on the ocean floor and
large river bed, that
means these are under the water.
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7. UNDERWATER MINDMILL
 An underwater windmill like a device that extract power from
the tides. Tidal energy offers a vast and reliable energy sources.
 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.
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8. TURBINE PLACED UNDER THE SEA AND
ROTATING IN THE DIRECTION OF FLOW
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9. HISTORY
 Until late nineteenth centaury windmills wound only
produce mechanical power of their task such as granting or
plumbing water.
 With the creation of electricity, wind mills make found that
wind mills could be attached to generator are used to create
power.
 The first windmill used to produce electrical energy was
created in 1888 by charles F brush
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10. HUGE TURBINE PLACED UNDER THE SEA
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11. MAIN PARTS
 Gearbox
 Generator
 Cable
 Support
 Turbines
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12. PRINCIPLE 0F OPERATION
 Is simple a underwater windmill consists of a number
of blades mounted on a hub (together knows as the
rotor), a gearbox, and a generator.
 The hydrodynamic effect of the flowing water past the
blades causes the rotor to rotate, thus turning the
generator to which the rotor is connected via gearbox.
 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.
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13. WORKING
 Under water turbines are a fairly straight
forward concept, as far as cutting edge
energy technology goes.
 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 its plugged into an electrical grid,
the electricity can be distributed.
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14. TYPES OF UNDRWATER WINDMILL
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15. TURBINE PLACED UNDER WATER
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16. MAINTANCE OF UNDERWATER WINDMILL
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17. ABOUT TURBINES
 The turbines can convert kinetic hydro energy in to
power rating from 25KW to 250KW, depending on
turbine size and current.
 Kinetic energy is converted to mechanical power in a
nacelle within the turbine.
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18. ADVANTAGES
 Tidal energy is completely renewable.
 Tidal energy produces no emission.
 Hidden beneath the water.
 Have lesser impact on the environment.
 Low running cost.
 Long lifetime with little maintenance.
 Reduces the dependence upon fossil fuels.
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19. DISADVANTAGES
 The initial cost is too high.
 Very difficult to install.
 The blade must be coated to avoid corrosion.
 special type material must have to used for blade.
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20. 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.
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21. REFERENCES
 K.McEnaney,.D. Kraemer, Z. Ren, and G. Chen,
"Modelling of concentrating Solar thermoelectric
generators, " J. Application.Phys., vol. 110,no 07,
pp.074502.6, Oct. 2011
 S. Jian and S. Modelling, "Numerical simulation of
electric-thermal performance of a solar concentrating
photovoltaic/thermal system," in proc. Power and Energy
Engineering Conf., Wuhan, China, 2009, pp.1-4.
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22. 22
Biru Waghamode
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