Bit noisy. http://www.youtube.com/watch?v=QmqpGZv0YT4
-BillMost importantly, it is incredibly cost-efficient to run – according to the designers, it costs less than one Euro per 100Km (about a tenth that of a petrol car). Its mileage is about double that of the most advanced electric car (200 to 300 km or 10 hours of driving), a factor which makes a perfect choice in cities where the 80% of motorists drive at less than 60Km. The car has a top speed of 68 mph.
Refilling the car will, once the market develops, take place at adapted petrol stations to administer compressed air. In two or three minutes, and at a cost of approximately 1.5 Euros, the car will be ready to go another 200-300 kilometres.
As a viable alternative, the car carries a small compressor which can be connected to the mains (220V or 380V) and refill the tank in 3-4 hours.
...
90m3 of compressed air is stored in fibre tanks. The expansion of this air pushes the pistons and creates movement. The atmospheric temperature is used to re-heat the engine and increase the road coverage. The air conditioning system makes use of the expelled cold air. Due to the absence of combustion and the fact there is no pollution, the oil change is only necessary every 31.000 miles.
True, but you're competing with internal combustion. Not exactly a high-efficiency process. How much energy would be spent building a whole car full of batteries and large motors? How much energy is lost in power charging conversion? I'll bet that any switching supply big enough to charge a car would also have a fan. So, I'm not sure it is as clear cut as you make it sound.BB said:And I can see compressed air storage as being much less efficient than battery storage... Ever play with an air compressor? There is quite a bit of heat generated. Part of the energy goes into compressing the air (raising the air pressure)--the other part goes into heating the air.
IIRC, even the picture of the guy using an air compressor to re-charge his car had a big fan/cooler on it. That waste heat is wasted energy.
I'm not a pneumatics engineer either, but I think is a false analogy. The pressure regulator is more like a switching regulator than a linear regulator. If I take a flow of 10 liters per minute at 300 bar and drop it to 30 bar I should end up with 100 liters per minute. Flow is like current and pressure is like voltage. The ideal gas law says that PV=nRT, and you can assume the number of gas atoms is constant when you decompress. You can also assume the temperature is constant. (I know gas cools when you expand it, but you could heat it back to the same temperature as the gas in the cylinder by just running the decompressed air through a radiator.) So, you have a constant right-hand side, so then, pressure and volume are linearly related.BB said:So, you try and pass that 3,000 PSI through a valve (or regulator). 3,000 PSI in, say 200 psi out. And your engine starts moving the car in a controlled manner.
However, you just dropped that pressure, effectively, as through a resistor. There was a lot of energy wasted (notice, that the air has now been cooled as it went through the valve).
jason9987 said:I can't see compressing air being any more efficient than charging batteries or converting water to Hydrogen but I guess it could be cheaper, The idea of using a Hybrid version and having a combustion engine to compress air does not seem like it would be any more efficient than using the gas engine to power the car. But maybe someone can correct me
Handlobraesing said:I thought dayyyum when they said the range, but at 4'45" he said it uses gas to compress the air as it goes...