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 E=mc^2 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

7. Look at the overhanging roof

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-
Solar Pool Heater

13. Why do we need this boiler?

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

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 sun’s 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.

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 stored…unless converted into a battery.