Monday, January 24, 2011

renewable energy the best way to conserve mother nature

Renewable energy is energy which is comes from natural resources. Renewable energy also derived from natural processes that are replenished constantly. In its various forms, it derives directly from the sun, or from heat generated deep within the earth. Included in the definition is electricity and heat generated from solar, wind, ocean, hydropower, biomass, geothermal resources, and biofuels and hydrogen derived from renewable resources. Climate change concerns, high oil prices, and increasing government supports are driving increasing renewable energy legislation, incentives and commericialization.



SOLAR ENERGY


solar energy are energy derived from the sun through the form of solar radiation. solar powered electrical generation relies on photovoltaics and heat engine. solar technologies are broadly characterized as either passive solar or active solar depending on the way they captured. Active solar techniques include the use of photovoltaic panals and solar thermal collectors to harness the energy. passive solar techniques include orienting a building to the sun, selecting material with favorable thermal mass or light dispering properties and designing spaces thar naturally circulate air.

A partial list of solar application:

use for generating electric for household application


solar camping lantern
 solar cars













BIOFUEL

biodiesel  is made from vegetable and animal fats or recycled greases. Biodiesel can be used as a fuel for vehicles in its pure form, but it is usually used as a diesel additive to reduce levels of particulates, carbon monoxide, and hydrocarbons from diesel-powered vehicles. Biodiesel is produced from oils or fats using transesterification and is the most common biofuel in Europe.

HYDROPOWER
Hydropower, hydraulic power or water power is power that is derived from the force or energy of moving water, which may be harnessed for useful purposes. Prior to the widespread availability of commercial electric power, hydropower was used for irrigation, and operation of various machines.
Another method used a trompe to produce compressed air from falling water, which could then be used to power other machinery at a distance from the water.
In hydrology, hydropower is manifested in the force of the water on the riverbed and banks of a river. It is particularly powerful when the river is in flood. The force of the water results in the removal of sediment and other materials from the riverbed and banks of the river, causing erosion and other alterations.



sarawak Bakun Hydroelectric Dam has reached a height of 207 metres it the second tallest Concrete Faced Rockfill Dam in the world.


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