KITE ENERGYPRESENTED BY: Gaurav singh
PRESENTATION OVERVIEWIntroductionEnergy sourcesLimits of present renewable technologiesCross wind kite powerConstructional detailsOperating principlesLimitationsAdvantagesComparison with other renewable resourcesSummaryReferences
INTRODUCTION Developed inItalythat 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
Renewable energy source
Less Area required
CROSSWIND KITE POWERTraditional 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 DETAILSTHREE MAIN COMPONENT KITE TETHER GROUND STATION
KiteThe 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.
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 stationHolds 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)
OPERATING PRINCIPLEPower generated by the energy kite can be given by, where,
A- area of the kite wingCL- lift coefficientCD- drag coefficientVW- velocity of windA 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 experiences- angle between the direction of this force and the wind
CONCLUSION Wind Power from Kites is a potential renewable energy technologyHighaltitude 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.