Solar energy


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Solar energy

  1. 1. Use of Solar Energy in water heating !!
  2. 2. What is Solar Energy ?? Solar energy is energy that is derived from the suns rays. The light and the heat provided by the sun is “collected” or harnessed by solar panels and then converted into a more useful form of energy. There are two main forms of solar energy – passive solar energy and active solar energy.
  3. 3. Uses of Solar Energy in various applications -> Solar energy is frequently used to power the radio and TV station as it is reliable, renewable, affordable, and need less maintenance. Solar energy is also used to supply power to lighthouse and warning light for aircraft. -> Solar energy is also used for public transportation such as trolleys, buses and light-rails. -> Remote building like school, community hall and clinic also use the solar energy. Specialized water pump is used which run on solar energy to pump water in remote area for portable water supply. Large scale desalination plant also use power generated from solar energy instead of electricity.
  4. 4. Uses of Solar Energy in heating water- ‘Solar Heating’ Sunlight is Earth's primary source of energy. The solar constant is the amount of power that the Sun deposits per unit area that is directly exposed to sunlight. The solar constant is ~1,370 watts per square meter or ~1273 watts per 10 square feet
  5. 5. Solar Water Heating !! Heat water for your home using energy from the sun. Solar water heating systems use free heat from the sun to warm domestic hot water. A conventional boiler or immersion heater can be used to make the water hotter, or to provide hot water when solar energy is unavailable.
  6. 6. Hot water throughout the year: The system works all year round, though you'll need to heat the water further with a boiler or immersion heater during the winter months. Cut your bills: Sunlight is free, so once you've paid for the initial installation your hot water costs will be reduced. Cut your carbon footprint: Solar hot water is a green, renewable heating system and can reduce your carbon dioxide emissions. Benefits of Solar Heating !!
  7. 7. Solar water heating systems use solar panels, called collectors, fitted to your roof. These collect heat from the sun and use it to heat up water which is stored in a hot water cylinder. A boiler or immersion heater can be used as a back up to heat the water further to reach the temperature you want. There are two types of solar water heating panels: -> evacuated tubes (as in the picture above) -> flat plate collectors, which can be fixed on the roof tiles or integrated into the roof. How do solar water heating systems work?
  8. 8. How to heat up water using Solar Energy with bottles !! -> Cut the bottoms out of large plastic bottles, the wider the better. -> Thread the bottles onto a hose
  9. 9. -> Run the water through the hose slowly and it will come out warm. -> Wait about one an hour for the air in the bottles to heat up Lay the hose out in full sunlight, run a little water through it to make sure there is water resting throughout the length of the hose.
  10. 10. Use of Solar heating in Large tanks -> Solar water heaters— also called solar domestic hot water systems—can be a cost-effective way to generate hot water for your home. -> Solar water heating systems include storage tanks and solar collectors. There are two types of solar water heating systems: active, which have circulating pumps and controls, and passive, which don't.
  11. 11. Integral collector-storage systems Also known as ICS or batch systems, they feature one or more black tanks or tubes in an insulated, glazed box. Cold water first passes through the solar collector, which preheats the water. The water then continues on to the conventional backup water heater, providing a reliable source of hot water Three types of solar collectors are used for residential applications: Flat-plate collector Glazed flat-plate collectors are insulated, weatherproofed boxes that contain a dark absorber plate under one or more glass or plastic (polymer) covers. Evacuated-tube solar collectors They feature parallel rows of transparent glass tubes. Each tube contains a glass outer tube and metal absorber tube attached to a fin. The fin's coating absorbs solar energy but inhibits radiative heat loss
  12. 12. There are two types of active solar water heating systems: Direct circulation systems Pumps circulate household water through the collectors and into the home. They work well in climates where it rarely freezes. Indirect circulation systems Pumps circulate a non-freezing, heat-transfer fluid through the collectors and a heat exchanger. This heats the water that then flows into the home. They are popular in climates prone to freezing temperatures.
  13. 13. Use of Solar Energy in in other applications !!
  14. 14. A solar vehicle is an electric vehicle powered completely or significantly by solar energy . Usually, photovolatic (PV) cells contained in solar panels convert the sun's energy directly into solar energy. The term "solar vehicle" usually implies that solar energy is used to power all or part of a propulsion. Solar power may be also used to provide power for communications or controls or other auxiliary functions. Use of Solar Vehicles !
  15. 15. Solar lighting especially for outdoors is very common today. Lighting walkways and other landscape is a simple matter. Most home improvement stores now offer solar powered outdoor lighting. The use of solar power doesn’t end there. Solar powered outdoor lighting is on a small portion of capturing the sun’s power for our energy. You can use solar energy for cooking, heating and cooling your home, water heating space heating, and even total solar energy systems to generate your own electricity. From very simple to complex grid systems solar power is available to the public. Use of Solar Energy Communication !!
  16. 16. Top 10 countries using Solar Energy!!! 1. Germany (9,785 MW) - 2. Spain (3,386 MW) - 3. Japan (2,633 MW) - 4. United States (1,650 MW) - 5. Italy (1,167 MW) - 6. Czech Republic (465 MW) - 7. Belgium (363 MW) - 8. China (305 MW) - 9. France (272 MW) - 10. India (120 MW) -
  17. 17. Facts on Solar Energy!!! -Solar Energy is measured in kilowatt- hour. 1 kilowatt = 1000 watts. -1 kilowatt-hour (kWh) = the amount of electricity required to burn a 100 watt light bulb for 10 hours. -According to the US Department of Energy, an average American household used approximately 866-kilowatt hours per month in 1999 costing them $70.68. -About 30% of our total energy consumption is used to heat water.
  18. 18. -> After initial investment, all the electricity you produce is free -> Incentives and Rebates from governments and utility companies offset the initial investment -> new financing vehicles such as leasing and Pace offset the initial investment while preserving the incentives and rebates -> Net metering gives you the opportunity of selling your excess electricity or getting a credit from the utility company -> reduce or completely eliminate your electric bill cost of solar panels are decreasing while efficiency is increasing Advantages of using Solar Energy !!
  19. 19. Disadvantages of Solar Energy !! -> high initial cost to purchase solar panel system -> a relatively large area is required to install a solar system -> the highest efficiency is dependent on full sun exposure -> no electricity can be produced at night, and reduced production on cloudy/rainy days
  20. 20. THANK YOU !!!