In response to Essential Power's request that I explain where the energy comes from as illustrated in the P/T graph below I submit the following.
The bleed air enters the pack with the pressure & heat energy given to it by engine combustion. As can be seen in the graph this illustrated by the entry P/T of 2.6 bar/190 degs.
The air flow now passes through the primary heat exchanger where some of the press & temp energy is lost and enters the ACM centrifugal compressor at 2.5bar/90 degs. The ACM impellor adds energy by accelerateing the air flow while the compressor diffusor converts this kinetic energy into pressure/temp energy. The air leaving the compressor at 3.6bar/140degs.
The air now enters the main heat exchanger and water extractor where more heat/pressure energy is lost by radiation & conduction so by the time it enters the ACM turbine the P/T is 3.55bar/40degs. As the air passes through the turbine and has to do work in accelerating the airflow in the compressor plus overcomeing internal frictional losses further energy is lost resulting in the pack outlet P/T being 1.1bar/-10 degrees C.
So overall the energy lost through the air cond pack amount to a 200 deg C drop in temp and a 21 psi drop in pressure.
Now to answer your other points.
1. "So prior to that you weren't even aware of the concept of the bypass, or what it was for".
2. "and your ignorance of it, greatly reduces your credibility."
I refer you to:-
One point you omitted was that the airflow doesn't have to go through the compressor on system start up. There is a by-pass valve that by-passes the air around to comp, then, as the turbine spins up and turns the compressor, the comp. delivery air back pressure closes the by-pass valve.
Which you agreed later was before you brought it up.
Furthermore during that long post you seem to have fogotten that there were times when you were asking for my support.
Finally may I wish all my readers a happy new year.