solar power tower

generation of electric power

1. SOLAR POWER TOWER ANEENA PAULSON

2. Contents Introduction Working Principle of Solar T ower Classification 1)Steam Based 2)Molten Salt Based Heliostat Central Receiver Parabolic Trough Photovoltaics Tower Design Advantages Disadvantages Application Establishment Of Solar Tower In India

3. INTRODUCTION Solar power tower generated electric power from sunlight by focusing concentrated solar radiation on a tower mounted heat exchanger (receiver). It uses an array of flat,moveable mirror(called heliostats) to focus the sun’s rays upon a collector tower (the

4. Target). The high energy at this point of concentrated sunlight is transferred to a substence that can store the heat for later use.

5. CLASSIFICATION Steam based Molten based

6. Steam Based Solar Tower Water is used to as medium which is converted to steam to generate eletric- power. In solar tower water is pumped to the receiver at topmost part of solar tower. New solar radiation would be concentrated on receiver at heliostate. Thus steam is generated due to rise in

7. Temperature inside the receiver tank, whi- ch is further used in steam turbine gener- ator.

8. HELIOSTAT Heliostat is a Greek word, Helios-sun, sat-stationary. A heliostat is a device that tracks the movement of a sun. Heliostat are mirror solar tracking on two axis it concentrated the reflected solar radiation on a focal point located at the top of a tower. A heliostat is a device made a plane metallic mirror which turns on as to keep reflecting sunlight towards a predetermined target.

9. Limitation of this method is there is no alternative to Produce eletricity in the absence of sunlight.

10. HELIOSTAT

11. CENTRAL RECEIVER It is used systems,use a field of distributed mirrors heliostats.That individually track the sun and focus the sunlight,on the top of a tower. By concentrating the sunlight 600-1000 times.They achieve temparature from 800 -1000 degree celcious.Receiver panel has fluid which collect heat.

12. PARABOLIC TROUGH Parabolic through consists of a linear parabolic reflector that concentrates light onto a receiver positioned along the flreoctos’s focal line.The receiver is a tube positioned right above the middle of the parabolic mirror and is filled with a working fluid. The reflector mirror to follow the sun

13. Parabolic During the daylight hours by tracking along a single axis. Parabolic trough systems provide t-he best land-use f-actor of any solar technology.

14. Photovoltaics Multiple solar cells are connected inside modules.Modules are wired together to form arrays, then tied to an inverter,which produce power at desired voltage,and for AC,the desired frequency/phase. Many residential systems are connected to the grid,in these grid-connected,use of energy storage is optional.In certain applications such as satellites,lighthouses etc…

15. Molten Salt Based Solar Tower Here melted solution of potassium nitrate and sodium nitrate of water as a medium. This molten salt mixture(60%sodium nitrate and 40%potassium nitrate)is used due to its properties of absorbing and accumulating heat energy for long time. This plant is known as Gama solar Tower. This type of solar tower will work for approximate 4-5 hours in absence of sunlight.

16. TOWER DESIGN it depends on the: Weight of the receiver Wind age area of the receiver Seismic consideration

17. Tower Design The weight and size of a receiver are affected by the fluid choice and heliostat field size. Typical weight for a 380MW receiver range from 250,000 kg for an external receiver using liquid sodium to 2,500,000 kg for a cavity air receiver. These would be placed at the top of a 140 to 170m tower.

18. Tower Design Material for Tower Construction Tower designs are of either frame steel contruction,using oil derrick design techniques,or concrete,using somkestack design techniques. The steel frame tower are less expe-

19. Sive at heights of less than about 120m and that concrete tower are less expensive for higher tower.

20. ADVANTAGES Solar energy is completely renewable resoures. Easy to operate Environmental neutrality Solar cells make absoultely no pollution.it produce no green house gases and waste products. Long-life operation guaranteeing .

21. DISADVANTAGES The most obvious drawback of solar energy is its sole dependence on the sun.once the weather becomes cloudy or no right time strikes,the energy collection comes to a halt. Huge amount of water and land is required. Solar pannel can also expensive,because of the materials are used to create.

22. APPLICATIONS Solar powered LED lighting system provides bright light charged by sunlight. Remote sensing Emergency roadside telephones Satelightes and spacecrafts. Solar vehicles,solar heater,solar cooker.

23. Establishment of solar tower in india As the three basic need(land,source,and Solar energy)are provided in india this can a great source of energy in future. As Tropic of cancer line passes through india which give indication that india can have great source of solar energy. As Tropic of cancer line passes through

24. Gujarath(so great amount of solar energy) and also a rich source of sodium nitrate and Potassium nitrate and a large flat surface is Available in Kutch,so that Gama solar tower Can be established there which will prove a great source of energy in future.

25. CONCLUSION It is very efficiency system can be increase- d by hybridizing it with the other conventi- onal plants.very economy excluding initial cost .Non pollutant power technology.it ca- n be implemented with alternative like WIND and HYDRO power generation.

26. QUESTIONS????

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