Homemade Wind Turbine

8/14/2019 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 aregenerating 260 Tega Watts hour (TWh) perannum, equaling more 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 in Nepal.

DANGRID, a Danish firm reported that 200 MW of potential electrical output with an annual energy production of 500 GWh can be produced betweenKagbeni 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 the combination of two phenomena:circulation of hot air and earth rotation.

A wind turbine is a rotating machine whichconverts the kinetic energy of wind intomechanical energy


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Types of turbine:Horizontal axis wind turbine (HAWT)Horizontal-axis wind turbines (HAWT) have the mainrotor shaft and electrical generator at the top of atower, and must be pointed into the wind.

Vertical axis wind turbine (VAWT)VAWT have the main rotor shaft arranged verticallyand turbine does not need to be pointed into thewind to be effective.


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HAWT & VAWT


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Advantages of HAWTVariable blade pitch, which gives the turbineblades the optimum angle of attack.

Tall tower base allows access to stronger windin sites with wind shear & consistent lateral

wind loading


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Disadvantages of HWAT The tall towers and blades up to 90 meters longare 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 frequentlyused.

Designs without yaw mechanisms arepossible with fixed pitch rotor designs

VAWTs have lower wind startup speeds thanHAWTs


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Disadvantages of VAWTLikelihood of blade failure by fatigue.

VAWTs may not produce as much energy at agiven site as a HAWT .

Changing out parts nearly impossible withoutdismantling the structure if not designedproperly.


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Power in wind The output from the wind machine depends uponfollowing factors:

Wind velocity

The cross-sectional area swept by the rotorOverall efficiency of the wind power unit.

The power available in wind= 1/8* **d 2*v3. Where

,=density of air.d=diameter of the rotor.v=velocity of air.


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Efficiency

Overall efficiency of the wind power unit ( 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 wingsat 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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MethodologyStep I : Designing the turbine after accessing the availableresources.

Step II: Short listing and collecting the required materials. 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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ContdCircular cross section metallic partsRectangular cross section hollow metallic unitsShaft ( 19 mm)

Tail vanePole

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 awind turbine was obtained

Step VI: A 12 Volts battery was employed to

excite the stator coil of the alternator. A 21Watts bulb was lighted.


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However the output was considerably less ie.8.65 volts and 0.96 ampere in actual field dueto reasons below:

Owing to heavy weight and improper alignment of flywheel and pulley of the alternator

Due to eccentric rotation of the flywheel.

Due to high tension in the V-belt.


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u ure po en a o w ntechnology of the world

& Nepal: The wind industry internationally is able toprovide at least 12% of the worlds futureelectricity needs by 2020.

In Nepal, Alternative Energy Promotion Centre(AEPC) estimated that the gross potential of

3000 MW of electricity can be generated fromwind energy.


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Contd.DANGRID, a Danish consulting firm working inNepal reported that 200 MW of potentialelectrical output with an annual energyproduction of 500 GWh.

This can be produced from the wind resources

between Kagbeni and Chusang in Mustangdistrict alone.


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Conclusion &Recommendation

Homemade Wind Turbine

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