"Harry K" wrote in message
s.com...
The heat problem is not in getting rid of it. The problem is that
that heat was produced while compressing the air and is then thrown
away. Right there should be a clue as one of the major reasons why
and "air engine" is not an economicaly viable design. That heat costs
money and represents energy that cannot be recovered.

This was already explained to the OP, and seems to have made no impression.

Vaughn