Quote:
Originally Posted by aerohead
*Mechanical engineering requires the study of thermodynamics.
*Within the study of thermo,engineers,or physicists are introduced to the 2nd Law of thermodynamics,which introduces the concept of 'Entropy'.
*Entropy has to do with how much work can you get out of a system,with respect to how much energy you're putting in.
*Understanding thermal and mechanical efficiency requires that you understand entropy.
*Allowing any high school student to graduate without a knowledge of Entropy is the greatest disservice a public educator could bestow upon a student.
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*If you take the amount of Btus in a gallon of gas (111,836,for Regular Unleaded,10% Ethanol ) this can easily be converted to Kilowatt/hours.
*Your gas tank capacity can be compared to a battery pack,or visa-versa.
*If you compare the range of a BEV,compared to the average ICE vehicle,all else being equal,on a Tank-to-wheels,or Battery-to-wheels Btu basis,you find that the electric powertrain will get you 3-times farther down the road,for an equivalent amount of 'fuel'.
*It's just straight engineering.No voodoo numbers manipulations.
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I understand this. Reading the title, I thought I'd see some radical purpose-built or at least heavily modded vehicle, because that's what you need to get 100 MPG at 100 MPH. It was cool.
But then I saw a pamphlet on how electric is more efficient that ICE. Volt and Bolt? Not so cool.
Yes, they are more efficient (at least if you discount the efficiency of electricity generation, which varies a lot from one place to another).
Yes, it's worthwhile to write about it because there are some who don't know this important fact.
But the headline is wrong, MPG is not MPGe and the article doesn't deliver what it promises.