In article , Richard J Kinch
says...

Yes, that was the original question. But the answer is, regulators are
lossy, even if you assume the compressor is 100 percent efficient and
lossless.

The process you describe (compressing to a higher pressure
and then regulating down to the point of use) may be less
efficient, overall. But the statement 'regulators are lossy'
is incomplete and inaccurate in light of the overall system
you describe.

There is no dissipation in the regulator itself.

Jim

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