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Solar
What Is Solar Energy?
Every day, the sun radiates (sends out) an enormous amount of
energy—called solar energy
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This energy comes from within the
sun itself
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The sun makes energy in its inner core in a process
called nuclear fusion
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An active solar house may use special collectors that
lookThe process of fusion mostwith glass
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This matter is emitted as
radiant energy
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Dark-colored metal plates inside the
boxes absorb sunlight and change it into heat
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) Air or water flows through the collectors
and is warmed byIsotopeheat
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Fusion
It takes the sun’s energy just a little over eight minutes to travel the
93 million miles to Earth
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0 x 108 meters per second
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Every hour enough solar
energy reaches the Earth to supply our nation’s energy needs for a
year! Solar energy is considered a renewable energy source due to
this fact
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Solar energy accounts for a very small
percentage of U
...
energy—less than one percent
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Solar Collectors
Energy
Helium
Neutron
Solar Collector
On a sunny day, a closed car becomes a solar collector
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The heat energy becomes trapped inside
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Capturing
sunlight and putting it to work is difficult because the solar energy
that reaches the Earth is spread out over a large area
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The amount of solar energy an area receives depends on the time of
day, the season of the year, the cloudiness of the sky, and how close
you are to the Earth’s Equator
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A closed car on a sunny day is like a solar collector
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The absorbed light changes
into heat
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A closed car can get very hot!
Passive Solar Home
SUMMER SUN
Solar Space Heating
Space heating means heating the space inside a building
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A passive solar
home is designed to let in as much sunlight as possible
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Sunlight passes through the windows and heats the walls and floor
inside the house
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A passive solar home does not depend on mechanical equipment,
such as pumps and blowers, to heat the house, whereas active solar
homes do
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Heating water for bathing,
dishwashing, and clothes washing is the second largest home
energy cost
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A solar water heater works a lot like solar space heating
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The sunlight heats water in a tank
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Solar Electricity
Solar energy can also be used to produce electricity
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Photovoltaic Electricity
SOLAR PANELS (PHOTOVOLTAIC)
Photovoltaic comes from the words photo, meaning light, and
volt, a measurement of electricity
...
You are probably familiar with
photovoltaic cells
...
Solar cells are made up of silicon, the same substance that makes up
sand
...
Solar
cells can supply energy to anything that is powered by batteries or
electrical power
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The action of the
electrons starts an electric current
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There are no mechanical
parts to wear out
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It can cost 10 to 30 cents per kilowatt-hour to produce electricity
from solar cells
...
Solar systems are often used to
generate electricity in remote areas that are a long way from electric
power lines
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It is the largest photovoltaic plant in the country,
generating 25 megawatts of electricity—enough to power 3,000
homes
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Most solar thermal systems use a solar collector
with a mirrored surface to focus sunlight onto a receiver that heats
a liquid
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There are CSP plants
in California, Arizona, Nevada, Florida, Colorado, and Hawaii
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Solar energy has great potential for the future
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It does not pollute or otherwise
© 2015 The NEED Project
8408 Kao Circle, Manassas, VA 20110
1
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875
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S
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The steam turns a generator, which
produces electricity
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It cannot be controlled by any one nation
or industry
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www
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org
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