COP and Superheat - does is it help?

[mad fridgie]

Are we talking about evaporator outlet SH?... or compressor inlet SH?

It makes a big difference.

Agree.

I believe, chef is talking about evap superheat, but increasing evap SH will increase discharge SH, and is there then a benefit to the system as a whole.
If we have a fixed simple system any change within the system must also effect to some degree the rest of the system.
One thing that is also confusing, if you look at the nominal performance of a compressor (not design detail), the rating always shows high suction superheat, 100% useful, which in many cases is outside the working envelope and there is no practical way of getting this SH as useful.