22608943 Homemade Wind Turbine

7/28/2019 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

22608943 Homemade Wind Turbine

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