DarkMatter
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- Joined
- Oct 5, 2007
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Engine burns a lot more fuel when it drives the car. When an engine is idling, it uses very little fuel. At least half or less of fuel is used when engine idles. Because there is no load on the engine, thus no need for more fuel to be burned.
More load you put on the engine, more fuel is required to move a vehicle. A semi truck, gets about 5MPG. Because it has to tow a lot of weight. Typical fuel capacity can be anywhere from 50 to 200 gallons per tank and most semi's have a tank on each side,which doubles the capacity.
Think of it this way. If you are standing still, you use less air and less energy. But you start running, you use more air and energy. That energy has to come from some where. Your body uses vitamins and minerals from food as energy source or fuel. So if you dont feed your self 3 times a day, but keep running none stop, soon or later you will stop running permanently.
A bulb burns brighter when it uses more energy. 40W vs 100W.
Dont they teach you these things in school?? This is 4th grade science.
Every energy transfer/conversion has a loss and in the case of mechanical-to-electrical one that loss is big. Alternators and dynamos are very innefficient and suppose a big energy loss. Of course it's better than anything when there is no other option, but as long as there is an alternative, like just using electricity or just use the combustion engine, then that's better.
You say that when idling the engine consumes less. That's, of course, true. They procuce less energie/power too. An idling engine can't produce enough power to drive a car satisfactorily, so after a conversion and its attached energie loss, much less. The batterie would be charged with less energie than the one that the fuel engine was capable of produce, hence it would be able to produce less movement.
A combustion engine converts chemical energie into mechanical energie (movement). There is a loss.
An electrical engine converts electrical into mechanical. There is a loss.
Your suggested setup would follow this conversions and subsequent losses:
- Chemical to mechanical.
- Mechanical to electrical.
- Electrical to mechanical. (I obviated the chemical to electrical one, because it will happen in any case)
The second one is just totally unnecessary, you can just swap wich engine does the work and that is much more efficient.
Dont they teach you these things in school?? This is 4th grade science.
Sorry to use your words against you, but it just made me laugh the way you acted as an authority above him, while being so wrong.
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