• Like
Esa Unit5
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

Published

 

Published in Technology , Business
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Be the first to comment
    Be the first to like this
No Downloads

Views

Total Views
350
On SlideShare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
127
Comments
0
Likes
0

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide
  • But SF alone uses 5.36 GW per year

Transcript

  • 1. Alternative Energy Sources Renewable Sustainable Non-polluting
  • 2. Hydroelectric Power
    • Power of Falling water
    • Used for thousands of
    • years
  • 3. Potential to Kinetic Energy Potential Energy Kinetic Energy
  • 4. Hydroelectric Power & Dams
    • Three Gorges
  • 5. Hydroelectric Power Use
  • 6. US Hydroelectric Power
    • 7% total energy use
  • 7. Nuclear Energy
    • Large Reserves
    • Currently in use
    • 17% World’s Electricity
    • No greenhouse gases
    • Safety?
  • 8. Nuclear Fission Plants
  • 9. Fission
  • 10. Fissionable Nuclei
    • 235 U, 239 Pu (but not 238 U)
  • 11. Radioactivity
    • All elements with atomic number > 84
  • 12. What is Radioactivity
  • 13. Becquerel
    • 1897
  • 14. Radiation Hazards
  • 15. Radioactive Decay
    • Half Life = time until ½ original amount remains
  • 16. Half Lives Uranium-238 4 x 10 9 years Thorium - 234 24 days Carbon - 14 5730 years Polonium-214 1.6 x 10 -4 sec Plutonium-239 24,100 years
  • 17. Safety Concerns
    • Three Mile Island (1979)
  • 18. Chernobyl
    • 1986
  • 19. Santa Susana
    • 1959
  • 20. US Fission Reactors
  • 21. Chain Reaction
  • 22. Controlling the Chain Reaction
  • 23. Moderators
    • Absorb excess neutrons
    • Usually Carbon (boron or cadmium)
    • Concentrated U (“yellow cake” to 3% enrichment
  • 24. Disposal
  • 25. Yucca Mountain
  • 26. Nuclear Fusion Requires very high tempertures And high pressures
  • 27. Cold Fusion
  • 28. Tokamak
  • 29. The Other Solar Energy
  • 30. Availability
    • Daytime
    • Climate
    • Elevation
    • Latitude
  • 31. Earth’s Revolution
  • 32. Solar Angle
  • 33. Solar Radiation
  • 34. Passive Solar Energy
    • Socrates
    • “ In houses that look toward the south, the sun penetrates the portico in winter.”
  • 35. Archimedes
    • Burning Mirror
  • 36. Passive Solar Energy
    • Anasazi
    • deSaussure
  • 37. Active Solar Energy
  • 38. Photovoltaic Cells
  • 39. The Cost of Solar Cells
  • 40. Efficiency
  • 41. Concentrating Solar Energy
    • DOE Solar Two project (Nevada)
  • 42. Solar Energy
    • Pros Cons
    • +Renewable -low efficiency
    • +Nonpolluting -availability ≠ needs
    • +Si abundance -insolation variability
    • +Becoming - photodegradation economical
  • 43. The Other Solar Energy
  • 44. Windmills
    • Grinding grain, Dredging Marshes
  • 45. Wind Energy Origins
    • Warm air rises (less dense)
    • Cool air sinks
    • Convection
    • currents
  • 46. Air Pressure Variation
    • High pressure clockwise
    • Low pressure counterclockwise
  • 47. Extreme Pressure Variation
  • 48. Where is the Wind?
  • 49. Installed Wind Capacity
  • 50. Offshore Wind Farms
    • Ireland
    • Denmark
  • 51. Offshore Wind Capacity
  • 52. Transmission Troubles
    • Danger: high voltage
    • Ice storms
    • Discharge
  • 53. The Electricity Grid
  • 54. Bird Hazard?
    • Mainly large birds:
    • golden eagle Kestrels
    • red-tailed hawks
  • 55. Wind Energy
    • Pros Cons
    • Cheap --Variable •easy to install •easy to maintain -- Not where needed
    • Nonpolluting -- bird hazard
    • Non-carbon --need many turbines
  • 56. Geothermal Energy
    • Geyser power
    • Ultimately nuclear fission
  • 57. Heat from the Earth’s Interior
  • 58. Earth’s crust
  • 59. Boundaries and Hot Spots
  • 60. Island Formation
  • 61. Harnessing Steam
  • 62. California’s Resources
  • 63. Disadvantages
    • Sulfurous gases
    • Corrosion
    • CO 2 emission
  • 64. Iceland
  • 65. Iceland