Hi there,

 

How about using Air engine to be built up for normal day to day life use for e.g applications such as cars , bikes ,etc..

 

Thanks in advance...

and what are you going to compress the air with? also the fact that for practical pressures(70MPa), it is going to have a lower energy density than batteries. It's just not up to scratch yet.

A working practical application, around for many years, has been in model aeroplane engines. The gas is stored using air in plastic bottles, or carbon dioxide from sparklet bulbs. One of the practical problems is for the engine or pressure valve to freeze. Such an engine appears to me to be half of a refrigeration cycle, afterall. Then there is the mechanical inefficiency of compressing your gas in the first place.

A working practical application, around for many years, has been in model aeroplane engines. The gas is stored using air in plastic bottles, or carbon dioxide from sparklet bulbs. One of the practical problems is for the engine or pressure valve to freeze. Such an engine appears to me to be half of a refrigeration cycle, afterall. Then there is the mechanical inefficiency of compressing your gas in the first place.

 

I'm now thinking another example of this kind of thing is ballon powered vehicles

Are we talking about an engine using air, or are we talking about the internal combustion engine (used in aircraft) or the jet-engine (used in aircraft)?

using compressed air to do work.

i've seen a concept car that runs on liquid nitrogen, it passes the cold gas through a sort of radiator as it vapourises to run the cylinders without freezing them solid.