Moving Truck Pressure Difference and Energy
When a car or truck move down the highway they create a
zone of low pressure behind them. Would it be possible to use a
turbine to generate electricity using the pressure difference of the
air in front,sides,or bottom of the vehicle, or would the drag of
the turbine and generator negate any gains?
Capturing useful energy is actually very easy. The hard part is
capturing it in a cost-effective way. There are lots of sources of
useful energy around us -- the problem is that it costs to much to use
them. (electricity and gasoline are just too darn cheap!).
But to answer your question, yes you could capture energy from the
moving truck. You could use a wind turbine, or piezoelectric arrays,
or many other theoretical designs. The capture could influence drag on
the truck -- depending on which energy capture strategy you use,
the energy you save could be less than the extra energy you have to
use to keep the truck moving. And, the cost of the energy capture
equipment on the truck would also be a factor.
This illustrates the challenge with "theoretical" versus "practical"
energy generation. You can capture energy from almost anything --
wind, trees, sunlight, water flowing, people walking around, etc. The
question is how much does it cost to capture and use the energy
compared with the alternatives (electricity or gasoline).
Hope this helps,
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Update: June 2012