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Warm - Up 1. What is the process called when atoms are split?

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Presentation on theme: "Warm - Up 1. What is the process called when atoms are split?"— Presentation transcript:

1 Warm - Up 1. What is the process called when atoms are split?
2. What is the difference in reactions between a nuclear bomb and a nuclear power plant? 3. What are some advantages of nuclear energy? 4. What are some disadvantages of nuclear energy?

2 Chapter 18 Renewable Energy

3 Renewable Energy Renewable energy – energy from sources that are constantly being formed Solar Wind Water Earth’s heat

4 Solar Energy Sun - Medium sized star Nuclear fusion in the core
Fraction reaches the Earth All renewable energy comes directly or indirectly from the Sun

5 Passive Solar Heating Sun’s energy directly heats
Passive solar buildings – which way are windows (Northern Hemisphere)? Thick insulation

6 Passive Solar Heating Summer – sun in high in the sky
Overhang cools Winter – sun low in the sky Sunlight enters windows

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9 Active Solar Heating Sun’s energy is captured in collectors
Roof mounted Liquid heated in collectors Heats water for home

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12 Photovoltaic Cells Solar cells Convert sun’s energy into electricity
Nonpolluting Small electrical current Hundreds of acres of panels to heat a small town

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14 Solar Cells Extended periods of sunlight Energy stored in batteries

15 Wind Power Fastest growing energy source Cost effective
Erected in 3 months

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17 Wind Farms Windiest spots on Earth – generate more than 10X energy used worldwide Problem – transporting energy in rural areas to urban areas

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20 Biomass Fuel Plant material, manure, or an other organic material used for energy Burning dung or wood Wood is renewable to an extent

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22 Methane Bacteria decomposes organic waste – methane
Bio-gas digesters: ferment manure Dung-fired power station: produces electricity Decomposition of trash

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25 Alcohol and Ethanol Ethanol or alcohol
Fermented fruits or agricultural waste Corn – U.S. Gasohol – blend of gas and ethanol

26 Hydroelectricity Energy from moving water Expensive to build
Inexpensive to operate Last longer than fossil fuel plants Disadvantages?

27 Micro-hydropower Small streams No big dams Cheaper More remote areas

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29 Geothermal Energy Energy from heat inside the Earth’s crust
Pumps water or steam into a turbine U.S. in #1

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31 Geothermal Heat Pump

32 Alternative Energy Energy sources that are still in development

33 Tidal Power Tide rises – water flows behind dam
Tide lowers – water trapped behind dam Released and turns turbine Expensive

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35 OTEC Ocean thermal energy conservation
Differences in water temperatures Surface – warm Deep – cold Water boils at low temperatures in low pressure vacuum Boiling water  stream  turbine

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37 Hydrogen Gas When burnt combines with oxygen – H2O
Produced when electricity splits water

38 Hydrogen Gas Expensive to produce Pollution Must be compressed

39 Fuel Cell Fuel cell - produces electricity chemically
Combines hydrogen fuel with oxygen from the air

40 Energy Efficiency Energy efficiency (in %) = useful energy out//energy in x 100

41 Cogeneration Production of two useful forms of energy from same fuel source Waste heat from industrial furnace to turn turbine

42 Green Gadgets Video Clips


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