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RENEWABLE ENERGY

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RENEWABLE ENERGY By: Jorge Mar n and Fernando Mart n Just a few info to start A Renewable energy is an energy which comes from natural resources such as sunlight ... – PowerPoint PPT presentation

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Title: RENEWABLE ENERGY


1
RENEWABLE ENERGY
  • By Jorge Marín and Fernando Martín

2
Just a few info to start
  • A Renewable energy is an energy which comes
    from natural resources such as sunlight, wind, rai
    n, tides, and geothermal heat.
  • About 16 of global final energy consumption
    comes from renewable, with 10 coming from
    traditional biomass, which is mainly used
    for heating, and 3.4 from hydroelectricity. New
    renewable (small hydro, modern biomass, wind,
    solar, geothermal, and biofuels) accounted for
    another 3 and are growing very rapidly.

3
Wind Power
  • Wind power is the conversion of wind energy into
    a useful form of energy. For example
  • wind turbines to make electricity.
  •  windmills for mechanical power.
  • wind pumps for water pumping or drainage.
  • sails to propel ships.

4
Wind Farms
  • A large wind farm may consist of several hundred
    individual wind turbines which are connected to
    the electric power transmission network. Later
    the electricity created by this turbines will be
    transported to all the cities near there.
  • Many of the largest operational wind farms are
    located in the USA and China.

5
Environmental Effects
  • Compared to the environmental impact of
    traditional energy sources, the environmental
    impact of wind power is relatively minor.
  • Wind power consumes no fuel, and emits no air
    pollution, unlike fossil fuel power sources.
  • The energy consumed to manufacture and transport
    the materials used to build a wind power plant is
    equal to the new energy produced by the plant
    within a few months.
  • Although a wind farm may cover a large area of
    land, many land uses such as agriculture are
    compatible.

6
In the future
  • Globally, the long-term technical potential of
    wind energy is believed to be five times total
    current global energy production, or 40 times
    current electricity demand. This could require
    wind turbines to be installed over large areas,
    particularly in areas of higher wind resources.

7
Hydropower
  • Hydropower or water power is power derived from
    the energy of falling water.
  • The term is used almost exclusively in
    conjunction with the modern development
    of hydro-electric power.

8
Types of Hydropower
  • Conventional hydroelectric, referring to
    hydroelectric dams.
  • Run-of-the-river hydroelectricity, which captures
    the kinetic energy in rivers or streams, without
    the use of dams.
  • Small hydro projects are 10 megawatts or less and
    often have no artificial reservoirs.
  • Micro hydro projects provide a few kilowatts to a
    few hundred kilowatts to isolated homes,
    villages, or small industries.
  • Pumped-storage hydroelectricity stores water
    pumped during periods of low demand to be
    released for generation when demand is high.

9
(No Transcript)
10
Solar energy
  • Solar energy, radiant light and heat from the
    sun, has been harnessed by humans since ancient
    times using a range of ever-evolving
    technologies.
  • Solar energy technologies include solar
    photovoltaics (PV) and Solar thermal energy
    (STE).

11
Photovoltaics
  • Photovoltaics (PV) is a method for generating
    electric power by using solar cells to convert
    energy from the sun into a flow of electrons.
  • Photovoltaics power generation employs solar
    panels composed of a number of solar cells
    containing a photovoltaic material.
  • Materials presently used for photovoltaics
    include monocrystalline silicon, polycrystalline
    silicon, amorphous silicon, cadmium telluride,
    and copper indium gallium selenide/sulfide.

12
  • Solar cells produce direct current electricity
    from sun light, which can be used to power
    equipment or to recharge a battery. The first
    practical application of photovoltaics was to
    power orbiting satellites and other spacecraft.

13
  • Solar photovoltaics is growing rapidly to a total
    global capacity of 67,400 megawatts (MW) at the
    end of 2011, representing 0.5 of worldwide
    electricity demand.
  • More than 100 countries use solar PV.
  • Map of solar electricity
    potential in Europe.

14
  • Installations may be ground-mounted (and
    sometimes integrated with farming and grazing) or
    built into the roof or walls of a building
    (building-integrated photovoltaics).

15
Solar thermal energy (STE)
  • Solar thermal energy (STE) is a technology for
    harnessing solar energy for thermal energy (heat).

16
  • Solar thermal collectors can be
  • Low-temperature collectors are flat plates
    generally used to heat swimming pools.
  • Medium-temperature collectors are also usually
    flat plates but are used for heating water or air
    for residential and commercial use.

17
  • High-temperature collectors concentrate sunlight
    using mirrors or lenses and are generally used
    for electric power production.
  • STE is different from and much more efficient
    than photovoltaics.

18
Biomass
  • Energy converted by vegetation
  • Ecologic energy
  • Teorically infinite

19
Biomass
  • Most common form of obteining biomass is from
    forests
  • Specific growings
  • Excrements

20
Biofuel
  • Fuel
  • Bioethanol and biodiesel
  • Bioethanol is formed by sugars
  • Byodiesel came from vegetal oils

21
Pros and cons
  • NOT an ecologic energy
  • Not whorthwile
  • Less toxic than oil and fuel

22
Geothermal
  • Came from the heat of the earth
  • Two tipes of thermal area
  • Hidrothermal
  • Hidroelectric

23
Pros and cons
  • Practically no waste
  • Much more abundant than oil
  • It cant be transported
  • Leaves a contaminated water

24
Information from
  • http//en.wikipedia.org/wiki/Renewable_energy
  • http//www.sciencedaily.com/news/earth_climate/ren
    ewable_energy/
  • http//www.reegle.info/index.php?searchTermrenewa
    ble20energy20for20kidssiteclean_energy_search
    searchSearchgclidCJCXy8bKmbACFdKBfAodrEF0ZA
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