RENEWABLE ENERGY SOURCES UNIT1 Renewable Energy Source of

RENEWABLE ENERGY SOURCES UNIT-1

Renewable Energy “Source of energy that comes from resources which are naturally replenished on a human timescale” Ex. sunlight, wind, rain, tides and geothermal. Characteristics of renewable energy • Reproducible naturally • Sustainable resource of energy • Intermittency Need of renewable sources • Depletion of fossil fuel • Continuous rise in fuel prices • Environmental regulation for pollution emission reduction such as Kyoto protocol.

Renewable Energy: Ø Renewable energy is any source of energy that doesn't consume the finite resources of the Earth and can be easily and quickly replenished. Ø Renewable Energy can be regenerated in a short amount of time or is basically unlimited Ø At present only a small proportion of the world's energy needs come from alternative and renewable energy sources. ØThese exist in many forms including Solar, Wind, Tidal/Wave , Geothermal and Bioenergy (including Biomass, Biogas and Biofuels).

The Advantages of Renewable Energy: Ø One major advantage with the use of renewable energy is that as it is renewable it is therefore sustainable and so will never run out. Ø Renewable energy facilities generally require less maintenance than traditional generators. Their fuel being derived from natural and available resources reduces the costs of operation. ØRenewable energy produces little or no waste products such as carbon dioxide or other chemical pollutants, so has minimal impact on the environment. Ø Renewable energy projects can also bring economic benefits to many regional areas.

The Disadvantages of Renewable Energy: Ø It is difficult to generate the quantities of electricity that are as large as those produced by traditional fossil fuel generators. Ø Renewable energy often relies on the weather for its source of power. Ø Wind turbines need wind to turn the blades, and solar collectors need clear skies and sunshine to collect heat and make electricity. ØWhen these resources are unavailable so is the capacity to make energy from them. This can be unpredictable and inconsistent.

Conventional Energy Source Coal Petroleum Natural Gas Non Conventional Energy Source Solar Energy Tidal Energy Wind Energy Geo Thermal Energy Nuclear Fusion Energy Biomass Energy

Energy uses in developed countries industrial domestic transportation

1. Energy source which are use from ancient time and uses fossil fuel for generation are called conventional energy source 2. These are exhaustible and depleting every day 3. These are coal, petroleum, natural gas, oil etc. 4. It is necessary to conserve these sources

The energy sources which are renewable or un exhaustible called non conventional energy source These are pollution free and ecofriendly

The main source of solar energy is heat and light of sun on earth About 1% of world energy is provided by solar power plant It is most widely and easily available energy source

The surface receives about 47% of the total solar energy that reaches the Earth. Only this amount is usable.

The gravitation force between moon, sun and earth causes tides in the sea Because the moon is much closer to the earth so it exerts more gravitational force at earth as the result the tides follows the moon during its rotation around earth creating flow of tides. It is un economical but pollution free and eco friendly

The hot and high speed wind is used to rotate the wind mill by which wind turbine rotates and electricity is generated through this process

Energy produced by the natural processes occurring within the earth known as Geothermal Energy The major sources are molten, underground rock, magma etc.

NON CONVENTIONAL SOURCES These are Non renewable It will be exhausted one day Necessary to conserve Causes more pollution These are renewable These are continuously available No need to conserve Pollution free

These are renewable and un exhaustible No need to conserve Pollution free and eco friendly Available in abundant These are also known as “THE ENERGY OF THE FUTURE”