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Solar power

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solar power

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Solar power

  1. 1. 2012-13 SOLAR POWER
  3. 3. INTRODUCTION • Solar power is the conversion of sunlight into electricity, either directly using photovoltaics (PV), or indirectly using concentrated solar power (CSP). • Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. • Photovoltaics convert light into
  4. 4. Concentrated Solar Power  Concentrating Solar Power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam.  The concentrated heat is then used as a heat source for a conventional power plant. A wide range of concentrating technologies exists; the most developed are the parabolic trough , the concentrating linear Fresnel reflector, the Stirling dish and the solar power tower.  Various techniques are used to track the Sun and focus light. In all of these systems a working fluid is heated by the concentrated sunlight, and is then used for power generation or energy storage. Thermal storage efficiently allows up to 24 hour electricity generation.
  5. 5. A parabolic trough consists of a linear parabolic reflector that concentrates light onto a receiver positioned along the reflector'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 is made to follow the Sun during the daylight hours by tracking along a single axis. Parabolic trough systems provide the best land-use factor of any solar technology.
  6. 6. Solar Power Tower  A solar power tower uses an array of tracking reflectors (heliostats) to concentrate light on a central receiver atop a tower . These are more cost effective, offer higher efficiency and better energy storage capability among CSP technologies.
  7. 7. Stirling Concentrating Dish• The Stirling concentrating dish solar dish combines a parabolic with a Stirling engine which normally drives an electric generator. • The advantages of Stirling solar over pv cells are higher efficiency of converting sunlight into electricity & longer lifetime. Parabolic dish systems give the highest efficiency among CSP technologies. The 50 kW Big Dish in Canberra, Australia is an example of this technology.
  8. 8. Photovoltaics A solar cell, or photovoltaic cell (PV), is a device that converts light into electric current using the photoelectric effect.  Solar cells produce direct current (DC) power which fluctuates with the sunlight's  . For practical use this usually requires conversion to certain desired voltages or alternating current (AC), through the use of inverters.
  9. 9. Photovoltaic System  Multiple solar cells are connected inside modules. Modules are wired together to form arrays, then tied to an inverter, which produces power at the desired voltage, and for AC, the desired frequency/phase  Many residential systems are connected to the grid wherever available, especially in developed countries with large markets.  In these grid-connected PV systems, use of energy storage is optional. In certain applications such as satellites, lighthouses, or in developing countries, batteries or additional power generators are often added as back-ups. Such stand-alone power systems permit operations at night and at other times of limited sunlight.
  10. 10. PV modules for domestic purposes PV Array
  11. 11. Off Grid PV System
  12. 12. What type of light is the most effective ?I. There are seven types of lights in the sunlight :- VIBGYOR • Violet • Indigo • Blue • Green • Yellow • Orange • Red The solar panel works best in the red light whereas it works the poorest in violet light and medium in the green
  13. 13. Solar Power-Advantages  Solar energy is a completely renewable resource.  Solar cells make absolutely no noise at all.  Solar energy creates absolutely no pollution.  Very little maintenance is required to keep solar cells running.  Solar panels and solar lighting may seem quite expensive when you first purchase it, but in the long run you will find yourself saving quite a great deal of money  Solar powered panels and products are typically extremely easy to install.  As our oil reserves decline, it is important for us to turn to alternative sources for energy.
  14. 14. Solarenergyis not availableat night. Storingenergyis an important issue in orderto get continuous supplyof power. Solarenergycan be storedat high temperatures usingmoltensalts.Salts are an effective storagemediumas the costlowhavingspecificheat capacity. Off gridsystemsuse recharges batteriesto store excess electricitythat can be sent to transmissiongrid.
  15. 15. Other applications of solar energy 1. Concentrated solar power 2. Photovoltaic 3. Solar vehicles 4. Solar heater 5. Solar cooker 6. Passive solar energy 7. Satellites and spacecrafts 8. Small appliances like calculator 9. Remote Sensing 10. Emergency Roadside Telephones
  16. 16. END Thank you