In article ,
says...
In article , Ned Simmons
says...

conversion factor such that cfm X psi X constant = watts.
What would that factor be?

Hmm. This might actually work out, the energy
stored in a pressure vessel is (IIRC) 1/2 P(sq) x V
so if you imagine an amount of air at a given
pressure passing a point in a pipe, then
that would be a time rate change of energy.


If your formula is right (it sounds plausible to me), take
a tank where V=1 and P=1.

(P^2 X V)/2 = 1/2

Expand the gas so P=1/2 and V=2 and plug back into the
formula and you get 1/4. In other words, no constant
factor, no analogy, and expansion thru a regulator is
irreversible and wasteful of energy.

Ned Simmons