Solar Power

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Solar Power
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Before the bell rings get out your notes and
begin answering the following based on your row

• Row 1- (closest to the front!)- What are the
  three types of fossil fuels, and which do you
  believe is the best?
• Row 2- What is wind energy? How is it harnessed?
  What are the advantages and disadvantages?
• Row 3- What is hydroelectric energy? How is it
  harnessed? What are the advantages and
  disadvantages?
• Row 4- What is the difference between wave and
  tidal energy? How are they harnessed? What are
  the advantages and disadvantages?
• Row 5- What is biomass? What are the advantages
  and disadvantages?
• Row 6 (if there is one)- What is geothermal
  energy? How is it harnessed? What are the
  advantages and disadvantages?

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Solar Heating Systems

• Passive system
• Uses an architectural design which enhances the
  absorption of solar energy without mechanical
  power
• Is used to reduce heating costs but must have a
  backup system.
• Uses roof overhangs to shade windows in the
  summer, and in winter allows sunlight to
  penetrate into a room.
• Uses building materials that absorb heat energy

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Look at the overhanging roof
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Solar Heating Systems

• Active system
• Requires mechanical energy through pumps and fans
  to move air or water carrying heat to areas where
  heat is stored.
• Energy is collected in a flat plate collector
• They have been used in to heat homes but also
  solar water heaters, solar pool heaters, and
  space heating systems.

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Why do we need this boiler?
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Photovoltaic Cells

• A device made of silicon cells which changes
  sunlight directly to electricity through the
  release of electrons.
• Many uses (calculators, wristwatches, appliances,
  satellites, space shuttles, and some road signs.)
• Expanding globally and very important in Japan
• Have been used on the roof tops of buildings

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Solar Thermal Technology

• Uses mirror-lined dishes or panels that rotate
  with the sun and collect solar energy
• CSP- Concentrating solar power
• Converts the suns energy into heat which is then
  used to generate electricity.
• There are three types of CSP technologies
  trough, dish/engine, power tower

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Parabolic Trough

• Power plants use a curved trough which reflects
  the direct solar radiation onto a receiver (also
  called absorber or collector) running along the
  trough, above the reflectors

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Dish Design

• A dish system uses a large, reflective, parabolic
  dish (similar in shape to satellite television
  dish).
• It focuses all the sunlight that strikes the dish
  up onto to a single point above the dish, where a
  receiver captures the heat and transforms it into
  a useful form.

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Power Tower

• Use an array of flat, moveable mirrors (called
  heliostats) to focus the sun's rays upon a
  collector tower (the receiver).
• This tower has a steam turbine to create
  electricity.

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Solar lighting

• Parabolic collectors focus sunlight into a fiber
  optic system to illuminate buildings

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Fiber Optic Lighting
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Impacts of solar Energy

• No air pollution
• Inexhaustible supply
• Lack of consistent sunlight in most areas
• Requires large areas to produce a lot of energy
• Still too expensive to compete with fossil fuels
  in most cases
• Cannot be stored

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