Download Renewable Energy

This work was done by Ana Sofia Neves,
Mara Soares and Tatiana Governo. 12B
• Renewable energy comes from natural
sources that are constantly and sustainably
replenished.
• Harnessing energy from the wind, sun,
water, plants, and other renewable sources will
put your country on the path to a cleaner
environment, energy independence, and a
stronger economy.
Renewable Energy
Solar
energy
Wind
energy
Geothermal
energy
Hydropower
Bioenergy
Ocean
energy
Hydrogen
and Fuel
Cells
• Solar energy technologies use the sun's energy
and light to provide heat, light, hot water, electricity,
and even cooling, for homes, businesses, and industry.
• There are a variety of technologies that have been
developed to take advantage of solar energy.
• These include:
Photovoltaic Systems, which produce
electricity directly from sunlight.
Solar Hot Water,
heating water with solar energy.
Solar Electricity,
using the sun's heat to produce electricity.
Passive Solar Heating and Daylighting ,
using solar energy to heat and light buildings.
Solar Process Space Heating and Cooling,
Industrial and commercial uses of the sun's heat.
• Wind turbines, like windmills, are
mounted on a tower to capture the most
energy. Turbines catch the wind's energy
with their propeller-like blades. Usually,
two or three blades are mounted on a
shaft to form a rotor.
• A blade acts much like an airplane wing.
When the wind blows, a pocket of low-pressure
air forms on the downwind side of the blade.
The low-pressure air pocket then pulls the blade
toward it, causing the rotor to turn. This is called
lift. The force of the lift is actually much stronger
than the wind's force against the front side of
the blade, which is called drag. The combination
of lift and drag causes the rotor to spin like a
propeller, and the turning shaft spins a generator
to make electricity.
• Geothermal energy is the heat from the
Earth. It's clean and sustainable. Resources
of geothermal energy range from the
shallow ground to hot water and hot rock
found a few miles beneath the Earth's
surface, and down even deeper to the
extremely high temperatures of molten
rock called magma.
• Many technologies have been developed to take
advantage of geothermal energy - the heat from the
earth. NREL performs research to develop and advance
technologies for the following geothermal applications:
Geothermal Electricity Production,
generating electricity from the earth's heat.
Geothermal Direct Use,
producing heat directly from hot water within the earth.
Geothermal Heat Pumps,
using the shallow ground to heat and cool buildings.
•
Flowing water creates energy that
can be captured and turned into
electricity. This is called hydroelectric
power or hydropower.
• The
most
common
type
of
hydroelectric power plant uses a dam on a
river to store water in a reservoir. Water
released from the reservoir flows through a
turbine, spinning it, which in turn activates
a generator to produce electricity. But
hydroelectric power doesn't necessarily
require a large dam. Some hydroelectric
power plants just use a small canal to
channel the river water through a turbine.
This work was done by Ana Sofia Neves,
Mara Soares and Tatiana Governo. 12B
Bio energy is renewable energy made available from materials derived from
biological sources. Biomass is any organic material which has stored sunlight in the
form of chemical energy.
This work was done by Ana Sofia Neves,
Mara Soares and Tatiana Governo. 12B
The ocean can produce two types of energy: thermal energy from the sun's heat,
and mechanical energy from the tides and waves.
This work was done by Ana Sofia Neves,
Mara Soares and Tatiana Governo. 12B
A fuel cell is a device that converts the chemical energy from a fuel into electricity through a
chemical reaction with oxygen or another oxidizing agent. Hydrogen is the most common
fuel, but hydrocarbons such as natural gas and alcohols like methanol are sometimes used.
Fuel cells are different from batteries in that they require a constant source of fuel and
oxygen to run, but they can produce electricity continually for as long as these inputs are
supplied.
The energy efficiency of a fuel cell is generally between 40-60%, or up to 85% efficient if waste
heat is captured for use.
This work was done by Ana Sofia Neves,
Mara Soares and Tatiana Governo. 12B
Renewable energy in Portugal was the source for
52% of the country's electricity generation in
2010 - an increase of 28% in 5 years!
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This work was done by Ana Sofia Neves,
Mara Soares and Tatiana Governo. 12B
This work was done by Ana Sofia Neves,
Mara Soares and Tatiana Governo. 12B