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NATS 101 - Homework Assignment #3

NATS 101 - Homework Assignment #3 - Antonio Alarcon NATS...

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Antonio Alarcon 2/5/08 NATS 101: The World We Create Homework Assignment #3 1a) The overall efficiency of the overall process proved to be 5.1% 94.9% Energy loss (From extraction to wheel movement) The numerical value of 5.1% was achieved by multiplying each individual process, in decimal form, then multiplying that value by 100. It is important to note that the value 5.1% represents the efficiency of the system rather than a single process. In essence, in the process of extracting oil, 97% is usable. This 97% is then refined, yielding 87% usable energy out of the original 97%. From the remaining 87% usable energy, 97% out of the original energy is available after transportation…so on and so fourth. From this information, one can clearly see a negative trend, thus explaining the small value of 5.1%. 1b) The majority of the energy that is not used to move the car, 70% of the 21% derived from combustion of the fuel within the engine, is lost due to the following: heat (friction loss), cooling (radiator), and/or pollution (exhaust).

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