Kite energy

KITE ENERGY

PRESENTED BY: Gaurav singh

PRESENTATION OVERVIEW Introduction Energy sources Limits of present renewable technologies Cross wind kite power Constructional details Operating principles Limitations Advantages Comparison with other renewable resources Summary References

INTRODUCTION

Developed in Italy that takes power from high altitude winds. Kite-Gen organization was developed in Italy for adopting green

energy concept. Kite – Gen initiated its first project called “LADDER MILL” that could

generate 50Kw of power. Renewable energy is very low in cost. It does not have much negative impact on the environment. Airborne wind energy replaces the traditional structure of wind turbine

by Kites tethered to ground.

KITE-GEN The first design of KITEGEN is a small scale prototype. The electric actuators which hold the kite lines are fixed with

respect to the ground

NEED FOR ENERGY KITE Provides 80% of electricity

Environmental conservation

Renewable energy source

Abundantly Available

Less Area required

CROSSWIND KITE POWER

Traditional wind turbine is replaced by Energy Kite, a wind turbine with a rotor supported in the air.

Avoids the expense of tower construction. The Kite tethered to ground, flies in a crosswind

direction. After achieving certain altitude this Kite

obtains a circular trajectory. The power generated by energy Kite is

transmitted to ground simultaneously.

CONSTRUCTIONAL DETAILS THREE MAIN COMPONENT KITE TETHER GROUND STATION

Kite

The main component of the power generation system.

Material used must be light as well as strong to sustain various types of forces acting on it.

Consists of small turbines that generate power by using the velocity of wind.

Increase in number of rotors increases power output.

Tether Acts as a link for Kite to ground contact. Used to transmit energy generated by energy Kite to the ground station. Made of thick Aluminium wires surrounded by a high strength composite fibre

covering. When tether length exceeds a limit, it may lead to minor instability of the system. To overcome this and to get efficient power generation at short tethering distance,

multiple Kites are used.

Ground station

Holds the tether. Used as a resting place for

the energy Kite, when not in flight.

Occupies less ground space.

The ground station strength decides the length up to which the Kite can be tethered.

PRINCIPLE (kite energy)

RE-TRACTIONPHASE

POWERPHASE

TRACTION PHASE

YO-YO CONFIGURATION

OPERATING PRINCIPLE

• Power generated by the energy kite can be given by, where,

A- area of the kite wingCL- lift coefficientCD- drag coefficientVW- velocity of wind• A ratio of lift coefficient to that of drag coefficient is the drag ratio.• Initially the Kite is taken to a considerable height by the on board rotors attached to the Kite, which are

powered by electricity from the ground station.• When it reaches at suitable altitude, the Kite gets into its circular trajectory.

Cont.

• After this stage the same rotor generates energy when Kite gets into circular motion.

• Tether length plays an important role in setting diameter of rotation of the Kite.

• The total power Pwind that a flying wing extracts from this wind field is given by

where,

Fa- total aerodynamic force that the wing experiencesγ- angle between the direction of this force and the wind

CONCLUSION Wind Power from Kites is a potential renewable energy

technology High‐altitude wind power using tethered wind

turbine devices has the potential to open up a new wind resource in areas that are not served by conventional turbines.

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