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SUSTAINABLE ENERGY
Spring 2005
QUESTION 1
(35 points) Ford has recently released its first hybrid car and they need your help to
evaluate the effectiveness of their regenerative braking system.
Let’s consider a
“normal” commuting day where the vehicle which weighs 2800 lb is traveling on the
Mass Turnpike at 65 mph and then comes to a complete stop in bumper to bumper traffic.
(a) 50% Estimate how much energy is available for recovery and storage by the
regenerative braking system.
(b) 25% In early designs a mechanical flywheel was proposed to capture and store the
recovered energy. A flat right circular cylinder of radius 1/3 m and thickness 3.5
cm constructed of high strength steel ( max tensile strength 550 MPa, density =
7.8 g/cm
3
) What rotational speed would be needed to capture the energy released
from 65 mph to a full stop?
Is it possible to achieve this for this device?
(c) (25%) Can you propose any alternatives to capture and store the braking energy
that might work better?
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View Full DocumentRev. 3/11/05
1.818J/2.65J//3.564J10.391J/11.371J/22.811J/ESD166J
SUSTAINABLE ENERGY
Spring 2005
QUESTION 2
(35 points) The Kaya equation described in Chapter 6 of the text equates growth in GHG
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 Fall '04
 ClarkColton

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