Alysse Riggs and Julie Davis

haplessuseUrban and Civil

Nov 25, 2013 (3 years and 11 months ago)

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Alysse

Riggs and Julie Davis

General Information


In reality, wind energy is a form of solar energy


The sun's radiation heats different parts of the
earth at different rates when different areas absorb
or reflect at different rates.


Hot air rises, reducing the atmospheric pressure at
the earth's surface, and cooler air is drawn in to
replace it.


Air has mass, and when it is in motion, it contains
the energy of that motion("kinetic energy")

The Main Goal


To create alternative energy
that was renewable


That did not create
pollution in the air and
water


That could replace
nonrenewable sources and
pollution in the near future

http://www.4ecotips.com/eco/img0
906/Quietrevolution.jpg


Making A Difference


It is a clean source of renewable
energy that does not create air or
water pollution


The biggest wind turbines can
power over 600 houses


Global capacity was
approximately 70,000 megawatts
(1 megawatt can power over 250
homes)


By 2050 the answer to one third
of the world's electricity needs
will be found blowing in the
wind.



http://windeis.anl.gov/guide/photos/photo2.html


The Wind Turbines


Two Groups of wind turbines:
horizontal
-
axis turbine and
vertical
-
axis turbine (egg
-
beater)


Turbines are made of steel. The
blades are made of fiberglass
-
reinforced polyester or wood
-
epoxy.


The output of a wind turbine
depends on the turbine's size and
the wind's speed through the
rotor.



http://windeis.anl.gov/guide/basics/index.
cfm

http://www.sextonwindpower.com/files/wi
nd_turbine_drawing(1).gif


Wind Turbines Cont.


A wind energy system transforms
the kinetic energy of the wind into
mechanical or electrical energy


Electricity production and
consumption are most commonly
measured in kilowatt
-
hours (kWh).


A kilowatt
-
hour means one kilowatt
(1,000 watts) of electricity produced
or consumed for one hour.


Ex: One 50
-
watt light bulb left on for
20 hours consumes one kilowatt
-
hour of electricity (50 watts x 20
hours = 1,000 watt
-
hours = 1
kilowatt
-
hour).


http://www.solarnavigator.net/images/wi
nd_turbine_aalborg.jpg

Technological Obstacles


Wind turbines
-

Below 8
-
10 mph wind speed they do not
generate and have to cut out for safety reasons above 56 mph.
Their maximum generation is reached at about 30 mph.


Wind Farms
-

generate some power for 70
-
75% of the time but
this is often a mere trickle, so the total electricity produced is
only about 26% of their full potential.


The electricity produced cannot be stored and feeding it into the
national grid is complex and costly


a bill ultimately paid by the
consumer.


Coal or gas
-
fired power stations are essential to maintain
uninterrupted supplies of electricity when the wind is not
blowing


Developers claim a turbine lifespan is 20
-
25 years but many are
being replaced after just 9
-
12 years


with yet larger turbines


Political / Economic Obstacles


The electricity produced cannot be stored and feeding
it into the national grid is complex and costly , which
is ultimately paid by the consumer.


Wind turbines are being replaced every 9
-
12 years
which is costing more money


Negative Environmental Impacts


A turbine 375 feet high requires a
base of some 1000 tons of reinforced
concrete, to say nothing of the
materials needed to build service
roads. Together with peat
destruction on peat
-
rich sites, this
means that wind farms can take
years to pay back the carbon dioxide
they release during and after
construction, reducing even further
their contribution to climate
change.


Birds unaware of wind turbines
often crash into them and are killed
as a result.

http://www.freewebs.com/jwpaudubon/WIND%2
0TURBINE%20BIRDS.jpg