1024LectureFile14

1024LectureFile14 - 1 OK, So We Have a Problem Petroleum...

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Unformatted text preview: 1 OK, So We Have a Problem Petroleum (40) Natural Gas (23) Coal (23) Nuclear (8) Renewable (6) Total US Energy Production, 2005 Conventional Hydroelectric (45) Wood (31) Waste (9) Alcohol Fuels (6) Geothermal (6) Wind (2) Solar (1) Biomass 2 Alternative Energy Sources Solar: Indirect: Wind, hydroelectric. Direct: Solar heating, photochemical, photovoltaic, etc. Gravity. Geothermal. Hydroelectric, tides. 3 The Energy From the Sun is Vast Original source for fossil fuels. 20% of the sunlight on 20% of CA = total US energy needs. 2.16 x10 17 kwh/year. Drives wind and rain. K, 8th, Figure 15.30, Page 429. 4 Direct Solar Energy: Passive (1) Strategic landscaping. Simple: South-facing windows. White shingles. Mo, 7th, Figure 14,15, Page 341. Complex: Thermal storage. 5 Mo, 7th, Figure 14,15, Page 341. Advantages: Permanent, free source of hot water. Very low impact. Disadvantages: Expensive to install. Backup system required. Works best when/where needed least. Direct Solar Energy: Passive (2) Solar Hot Water Heater 6 Mo, 7th, Figure 14.14, Page 340. W/m 2 7 Direct Solar Energy: Active (1) Devices to focus/amplify the light. Leaves and magnifying glass. High-quality solar. Current plants use curved mirrors. Aim at central point. Rotate to maintain focus. http://www.eere.energy.gov/de/csp.html http://www1.eere.energy.gov/solar/csp.html http://www.menzelphoto.com/ gallery/big/altenergy2.htm PTH, 4th, Figure 14.18, Page 402. 8 Limitations Energy only produced during daylight. Must be supplemented to have power 24/7. Very low output during cloudy periods. Must be located in southwest. Some collected energy lost. Hot water loses heat to air. 9 Direct Solar Energy: Active (2) Converting light into other energies....
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1024LectureFile14 - 1 OK, So We Have a Problem Petroleum...

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