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Old 08-11-2008, 08:52 PM
raymond723 raymond723 is offline
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Default Renewable Energy Sources

The principal renewable energy sources are biomass from crops such as trees and corn, hydropower from flowing rivers, geothermal power from heat stored in Earth, wind energy from the movement of winds, and solar energy from the Sun.

Wood is part of an array of plant matter referred to as biomass that can be burned to produce energy. The combustible substances in biomass are primarily carbohydrates (and of these, primarily cellulose). Cellulose, whose simplest or empirical formula is CH2O, undergoes combustion to form carbon dioxide and water.

CH2O(s) + O2(g) → CO2(g) + H2O(g) ΔH = −14 kJ/g

Wood fuels continue to be used in the rural areas of developing countries.

Hydroelectric power is a well-developed energy source. Today, hydropower provides about 19 percent of the world's electricity supply. Because it is a clean, renewable source of energy, hydropower should continue to serve as a vital energy source.There has been a rapid growth in the use of wind turbines to generate electricity. In 2001 the amount of electricity generated in this way worldwide corresponded to the amount that would have been obtained from burning 15 million barrels of oil. Although this represents only about 0.05 percent of worldwide energy production in 2001, this fraction will increase.

Solar energy is the most significant and promising renewable energy source. Solar energy is converted to electricity by solar cells (also known as photovoltaic cells). A great deal of solar energy is used currently in what is known as passive heating (which can be directly experienced as the heat gain in a greenhouse caused by sunlight).

Last edited by Mad Scientist; 08-20-2008 at 10:53 AM..
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