22608943 Homemade Wind Turbine
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Transcript of 22608943 Homemade Wind Turbine
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Team Members Ankit Shrestha (062/BIE/05)
Deepak Rana (062/BIE/11)
Gopal Chaudhary (062/BIE/12) Prakash Acharya (062/BIE/25)
Rojesh Man Bajracharya (062/BIE/33)
Sangeet Lal Karna (062/BIE/36) Shalabh Poudyal (062/BIE/39)
Spandan Sharma Mishra (062/BIE/42)
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Background Since 2005, global wind installations more than
doubled.
All wind turbines installed worldwide are generating260 Tega Watts hour (TWh) per annum, equalingmore than 1.5 % of the global electricity consumption.
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Contd. Alternative Energy Promotion Centre (AEPC)
estimated that the gross potential of 3000 MW of
electricity can be generated from wind energy inNepal.
DANGRID, a Danish firm reported that 200 MW of
potential electrical output with an annual energy
production of 500 GWh can be produced between
Kagbeni and Chusang in Mustang district alone.
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INTRODUCTION
Wind energy is a form of solar energy
Generation of air currents is a direct affect of thecombination of two phenomena: circulation of hot airand earth rotation.
A wind turbine is a rotating machine which convertsthe kinetic energy of wind into mechanical energy
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Types of turbine: Horizontal axis wind turbine (HAWT)
Horizontal-axis wind turbines (HAWT) have the main rotorshaft and electrical generator at the top of a tower, and must
be pointed into the wind.
Vertical axis wind turbine (VAWT) VAWT have the main rotor shaft arranged vertically and
turbine does not need to be pointed into the wind to beeffective.
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HAWT & VAWT
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Advantages of HAWTVariable blade pitch, which gives the turbine blades
the optimum angle of attack.
Tall tower base allows access to stronger wind in siteswith wind shear & consistent lateral wind loading
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Disadvantages of HWAT The tall towers and blades up to 90 meters long are
difficult to transport.
Tall HAWTs are difficult to install.
HAWTs require an additional yaw control mechanism
to turn the blades toward the wind
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Advantages of VAWTA massive tower structure is less frequently used.
Designs without yaw mechanisms are possible withfixed pitch rotor designs
VAWTs have lower wind startup speeds than HAWTs
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Disadvantages of VAWT Likelihood of blade failure by fatigue.
VAWTs may not produce as much energy at a given siteas a HAWT .
Changing out parts nearly impossible without
dismantling the structure if not designed properly.
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Power in wind The output from the wind machine depends upon
following factors: Wind velocity
The cross-sectional area swept by the rotor Overall efficiency of the wind power unit.
The power available in wind= 1/8***d2*v3.
Where, =density of air.
d=diameter of the rotor.
v=velocity of air.
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Efficiency
Overall efficiency of the wind powerunit ( 0) = Useful output power
Wind power
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Working Principle of wind turbine:
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Working Principle of our blade
design
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Contd.
A rotating fan hits the air with its tilted wings at an
angle and if it is reversed, thats the principle in our
design. The flowing air strikes the blades in our
turbine rotating the blades.
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Methodology
Step I: Designing the turbine after accessing theavailable resources.
Step II: Short listing and collecting the requiredmaterials. The materials are: V belt ( A type)
Pulley ( A type)
Automobile alternator (12 Volts, 60 Amperes) Car battery (12 Volts)
Bearings
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Contd Circular cross section metallic parts
Rectangular cross section hollow metallic units
Shaft ( 19 mm) Tail vane
Pole
Step III: Fabrication of rotor blades & hub
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Contd. Step IV: Fabricating the frame
Step V: All the parts were assembled and a wind
turbine was obtained
Step VI: A 12 Volts battery was employed to excite the
stator coil of the alternator. A 21 Watts bulb was
lighted.
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Findings
The maximum output generated in the lab was 14.45
Volts, 1.6 Ampere electrical current which was enough
to light a 21 Watt electric bulb
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However the output was considerably less ie. 8.65volts and 0.96 ampere in actual field due to reasonsbelow:
Owing to heavy weight and improper alignment of flywheeland pulley of the alternator
Due to eccentric rotation of the f lywheel.
Due to high tension in the V-belt.
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Future potential of wind
technology of the world & Nepal: The wind industry internationally is able to provide at
least 12% of the worlds future electricity needs by2020.
In Nepal, Alternative Energy Promotion Centre(AEPC) estimated that the gross potential of 3000 MW
of electricity can be generated from wind energy.
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Contd. DANGRID, a Danish consulting firm working in Nepal
reported that 200 MW of potential electrical outputwith an annual energy production of 500 GWh.
This can be produced from the wind resourcesbetween Kagbeni and Chusang in Mustang district
alone.
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Conclusion &
Recommendation