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Renewable Energy (Ways to save Money and Fuel (Variable speed electric…
Renewable Energy
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Wind Power
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Advantages: abundant, widely distributed, and inexhaustible, carbon free and pollution free, fast and relatively cheap, increasing energy efficiency and reducing costs.
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Geothermal
Heat stored in soil, underground rocks, and fluids in earth's mantle.
The most energy efficient, reliable, environmentally clean, and cost effective way to heat or cool a space.
Advantages: medium net energy, low CO2 Emissions
Disadvantages: drilling wells is expensive and risky, not many hydrothermal sites, nonrenewable if heat is extracted faster than can be restored.
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Reasons for Energy Waste
Inefficient technologies such as: international combustion engine which propels most motor vehicles.
Nuclear, coal, and natural gas power plants
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Solar Energy
An active solar heating system captures energy from the sun by pumping a heat absorbing fluid. Some of that heat can be used directly and the rest can be stored.
Solar thermal systems, also known as concentrated solar power, use different methods to collect solar energy to boil water and produce steam for generating electricity. Two Systems: parabolic mirrors & moving mirrors.
photovoltaic cells: converts solar energy directly into electrical energy using photovoltaic cells commonly called solar cells.
Advantages: no greenhouse gases or pollutants, no toxic materials, easy to use, low maintenance
Disadvantages: low energy efficiency, cannot rpoduce electricity at night, storing energy is expensive.
Biomass
Energy is produced by burning solid biomass or organic matter found in plants or plant related material. Also, by converting it to gaseous or liquid biofuels.
Advantages: can be grown throughout much of the world, no net increase in CO2 emissions, easy to store and transport.
Disadvantages: 20% more greenhouse gases to atmosphere, huge amount of water, large volumes of wastewater, biomes are being destroyed.
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