Solar Power

1
Solar Power
2
HW

• pages 450 - 456 Homework questions pg. 457
• 4, 7, 10, 11, 13, 17, 18, 20, 21, 22

3
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?

4
What is Solar Energy?

• Where does it come from?
• What does not make sense about the sun to you?
  What questions do you have
• What does Emc2 have to do with solar energy? (c
  299,792,458 m/s)
• How much energy is stored in atoms in a person?
  How many atomic bombs?

5
2 Types of Solar Heating Systems

• Active and Passive Solar HEATING
• What is a 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

6
(No Transcript)
7
Look at the overhanging roof
8
(No Transcript)
9
(No Transcript)
10
(No Transcript)
11
What is Active Solar Heating?

• What is an 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.

12
Homemade Active Solar Heaters

• Solar Window Heater- http//www.youtube.com/watch?
  vBqS3vnM2G7Ufeaturerelated
• Solar Pool Heater http//www.youtube.com/watch?vT
  UzbJ6LeaVcfeaturerelated

13
Why do we need this boiler?
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
(No Transcript)
18
What is Solar Electric (2 types)?

• 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
• Have been used on the roof tops of buildings

19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22
(No Transcript)
23
(No Transcript)
24
Solar Electric Type 2

• Solar Thermal Technology
• Uses mirror-lined dishes or panels that rotate
  with the sun and collect solar energy
• Also called 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

25
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

26
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.

27
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.

28
(No Transcript)
29
(No Transcript)
30
CSP Video

• Click Here

31
Solar lighting

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

32
Fiber Optic Lighting
33
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 storedunless converted into a battery.

34
(No Transcript)