Compressed Air Car

[euromodder]

Originally Posted by nmgolfer

The way to store hydrogen for use in vehicles is in metal hydrides

Ever seen a car ablaze with a laptop and a Lithium-battery in it ?
Gets funky when the fire brigade throws water on it !

[Ryland]

Where do you get the kind of air pressure to recharge your air powered car and where do you get the energy to run it?
Alot of compressed gas's that are sold are not pumped as much as they are frozen to compress them.
Also things like small propane tanks are one time use only because they are so light weight that you are not allowed to transport them, it's a DOT rule not a propane rule, that is why you can get home refill kits for filling them off larger heavy tanks but you will never find a store that will refill your small hand held tank.

[Bicycle Bob]

Safety relief valve, eh? An oxygen cylinder got dropped on delivery to my high school, and it wrecked 3 classrooms as a whirling rocket. Somebody was damn glad they had followed the rule about avoiding a school in use.

[Cancerkazoo]

I would imagine if the safety valve was big enough and the tanks were secure you could dump a lot of air at once in an accident and not create a rocket launch.

[Bicycle Bob]

An accident does not leave you enough microseconds to dissipate the energy as anything but an explosion. Sending a rocket straight up would probably be the safest option.

[Patrick]

Originally Posted by Bicycle Bob

An accident does not leave you enough microseconds to dissipate the energy as anything but an explosion. Sending a rocket straight up would probably be the safest option.

What goes up must come down.

[Patrick]

Originally Posted by Ryland

Where do you get the kind of air pressure to recharge your air powered car and where do you get the energy to run it?
Alot of compressed gas's that are sold are not pumped as much as they are frozen to compress them.
Also things like small propane tanks are one time use only because they are so light weight that you are not allowed to transport them, it's a DOT rule not a propane rule, that is why you can get home refill kits for filling them off larger heavy tanks but you will never find a store that will refill your small hand held tank.

Where I used to work we had a cascade air system for our 2250 psi tanks. It was 220V and took several hours to charge the whole cascade (a series of large tanks that could be used in succession to fill smaller tanks to a high pressure). The system cost about $10,000.

Propane tanks are very low pressure in comparison. You just need enough pressure on the propane for it to change state into a liquid (about 150 psi @ 90F).

[nmgolfer]

Originally Posted by Patrick

Propane tanks are very low pressure in comparison. You just need enough pressure on the propane for it to change state into a liquid (about 150 psi @ 90F).

Yep... Propane gas (top of the tank) is always at the vapor pressure which is a function of temperature but pretty low even on hot days.

[nmgolfer]

Originally Posted by euromodder

Ever seen a car ablaze with a laptop and a Lithium-battery in it ?
Gets funky when the fire brigade throws water on it !

Can't say I have but what's your point? What does chemically bonded hydrogen storage in metal hydrides have to do with lithium ion battery fires?

[winkosmosis]

The range of these things is useless. Don't fall for the hype... and especially the ridiculous perpetual motion bull**** I saw parroted on Discovery Channel.