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Solar Energy

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This energy radiates out from the sun in all directions. ... Thousands of years ago, the Anasazi Indians in Colorado incorporated passive ... – PowerPoint PPT presentation

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Title: Solar Energy


1
Solar Energy
  • Radiant energy produced by fusion in the suns
    core. This energy radiates out from the sun in
    all directions.
  • Some of it reaches the earth as radiant energy.

2
Disadvantages
  • Solar cars only run well during the day with
    direct sunlight and no clouds
  • Equipment can be costly to make
  • The energy needs to be stored so it can be used
    at night too

3
Advantages
  • Clean source of energy that have a low
    environmental impact
  • Renewable energy that can be used for years and
    years.
  • Saves money within households

4
Availability!!
  • Comes from the sun, so it has to be stored so it
    can be used at night
  • Renewable
  • Depends on time of day

5
Researchers
  • Kurt Yeager, Jane Perkins, Carl Pope, David
    Freeman, and Luster Brown
  • Freeman and others

6
Cost
  • Solar water heating fo one house/year 400
  • 30cents/ kilowatt in homes
  • Electric power research institute has spent 500
    million a year on research

7
Photovoltaic (solar cell systems)
  • Solar cells also can be used to power outdoor
    lighting fixtures. Producing electricity directly
    from sunlight. Solar cells also can be used to
    power outdoor lighting fixtures.
  • use-Solar cells are often used to power
    calculators and watches.
  • But because the lenses must be pointed at the
    sun, the use of concentrating collectors is
    limited to the sunniest parts of the country.

Solar
8
Concentrating Solar Systems
Using the sun's heat to produce electricity
Use-Many power plants today use fossil fuels as a
heat source to boil water.
9
Passive Solar Heating and Day lighting
  • Using solar energy to heat and light buildings.
  • Thousands of years ago, the Anasazi Indians in
    Colorado incorporated passive solar design in
    their cliff dwellings. Credit John Thornton
  • use-Today, many buildings are designed to take
    advantage of this natural resource through the
    use of passive solar heating and daylighting.

10
Solar Hot Water
  • Heating water with solar energy.
  • For solar hot water systems, flat-plate solar
    collectors are typically installed facing south
    on a rooftop.

use-The shallow water of a lake is usually warmer
than the deep water. That's because the sunlight
can heat the lake bottom in the shallow areas,
which in turn, heats the water. It's nature's way
of solar water heating. The sun can be used in
basically the same way to heat water used in
buildings and swimming pools.
11
Solar process heat and space heating and cooling
  • Industrial and commercial uses of the sun's heat.
  • Use-ventilation air preheating, solar process
    heating, and solar cooling.
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