se05midtermexam

# se05midtermexam - Rev...

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Rev. 3/11/05 1.818J/2.65J//3.564J10.391J/11.371J/22.811J/ESD166J 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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Rev. 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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## This note was uploaded on 11/27/2011 for the course CHEMICAL E 10.302 taught by Professor Clarkcolton during the Fall '04 term at MIT.

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se05midtermexam - Rev...

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