The document discusses vertical-axis wind turbines (VAWTs), which have several advantages over traditional horizontal-axis wind turbines. VAWTs can accept wind from any direction, do not require yaw mechanisms to face the wind, and have their generators mounted at ground level for easier maintenance. They are also quieter and more stable than horizontal turbines. However, VAWTs generally operate in poorer wind conditions near the ground and have challenges with self-starting. The document outlines different types of VAWTs including Darrieus and Giromill rotors, and describes their applications for small-scale power generation.

1. Introduction :
 Wind power turbines come in handy in the market today.
Vertical-axis wind turbine happens to be one of the most
popular and widely coveted wind turbines.
 It is also more practical, reliable and cost effective has the
best longevity and durability features. Therefore, you will be
able to use it efficiently over a long haul.
 The turbine is also designed in a unique way that enables it to
work efficiently in an urban and suburban area.
 They feature turbulent environs and this means that they yield
greater fluctuations in terms of wind speed and wind
direction. The shaft in the turbine rotates vertically thus
providing enhanced performance in turbulent environments.

2. Wind Energy :
The kinetic energy of the wind can be changed into
other forms of energy, either mechanical energy or
electrical energy.
The kinetic energy contained in wind can be
transferred to other objects, such as boat sails, or
transformed into electrical energy through wind
turbine generators.
With the recent surge in fossil fuels prices, demands
for cleaner energy sources, and government funding
incentives, wind turbines are becoming a more
viable technology for electrical power generation

3. How Wind Turbines Work?
All wind turbines essentially work the same way
with minor modifications depending on size and
configuration.
The wind turns the blades to spin a shaft which
connects to a generator which produces
electricity.
Essentially the rotors harness the kinetic energy
of the wind and coverts it into electrical energy.

4. Types of Axis :
Horizontal Turbine :
 Higher wind speeds
 medium efficiency
 has to be moved into the direction of
the wind
 very high power
 Efficiency – 18% to 20%

5. Types of Axis :
Vertical Turbine :
 Can place generator on ground
 You don’t need a yaw mechanism
 Wind direction doesn’t matter, it
adjusts to it its self.
 medium power
 Efficiency – 50% to 60%

6. Vertical Axis Wind Turbine :
 We make a “Giro Mill” type VAWT.
 VAWTs are rugged, quiet, Omni-directional.
 VAWT doesn’t create as much stress on the
support structure.
 It can be installed on chimneys and similar tall
structures.
 Popularizing the wind energy for domestic
application.

7. Feature :
The generator shaft is vertical to the ground.
The blades point upward.
The generator is mounted on a short tower.
It can be installed anywhere because its
compact size and simplified in design.
The turbine starts rotating at 4m/s speed.
The VAWT’s efficiency is around 50% to 60%.

8. Types of VAWT :
 Darrieus :  H-Darrieus-Rotor

9. Types of VAWT :
 Giromill  Helical

10. Advantages :
Accepts wind from any angle - no yaw system
Better answer to rapidly changing winds
Components can be mounted at ground level
– Ease of service
– Lighter weight towers
Virtually silent operation
High Mechanical stability.

11. Disadvantages :
Rotors are generally near ground where wind is
poorer
Poor self-starting capabilities
Requires support at top of turbine rotor sturdy
construction
Requires support at top of turbine rotor
Overall poor performance and reliability (although
it is argued that it is mainly due to lack of research
and development and not aerodynamics)

12. Application :

13. Conclusion :
 we done our literature survey on VAWT. And it has
try to mentioned advantages, applications,
limitations.
And also it is understood that in the future most of
our energy source will based on wind energy.
We have to do this on small rating VAWT. The rating
is 10watt.

14. References :
 Non-Conventional energy sources by smt. C.K.Rai
 Wikipedia Encyclopedia. Retrieved from
http://en.wikipedia.org/wiki/Image:H-Darrieus-
Rotor.png.jpg on November 28, 2005.
 Read some Papers on VAWT through Wikipedia
 http://www.urbanwind.net/pdf/technological_analysis.p
df
 We have to use catalogue of ohms groups.

15. -Thank You
Prepaid by PARTH PATEL….
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