by MacG » Tue 20 Mar 2007, 15:08:53
$this->bbcode_second_pass_quote('smallpoxgirl', '')$this->bbcode_second_pass_quote('Olle', 'T')he problem is that it is so extremely energy inefficient. Worse than the ICE
It seems like a pretty cool deal at first glance, but this seems like the unavoidable problem. The engine in the aircar functions essentially the same as an ICE.
The tanks on the car hold 90 cubic meters of air at 300bar.
SourceThat's 2.7 gigajoules of energy. A gallon of gasoline, by contrast, has 130 megajoules of energy. So the tanks hold the same energy as about 20 gallons of gasoline. It only gets 200km on a fill, so that's an equivalent efficiency of about 6 miles per gallon.
2.7 gigajoules = 750 kwh. Assuming the compressor is 33% efficient, it would consume 2250 kwh of electricity. At $0.10 per kwh, it would cost $225 to fill the tank.
Anybody find an error in my calculations?
Yea. 90 m3 must refer to the expanded volume at 1 bar. Otherwise it will be a hell of a large tank. 300 liters at 300 bar is more reasonable.