I am looking for typical control schemes for a refrigeration unit with a screw compressor, direct inlet oil injection, variable speed fan driven condensor with water spray, and a heat exchange where the process outlet temperature is the target variable.
The unit is fully instrumentd. There are temperature and pressure measurements all around, but no flows. I have tried contacting the compressor vendor and other compressor suppliers, but none are willing to even suggest an example control scheme.
I would appreicate any help in identifying control scheme(s) and what information about the compressor is necessary to obain efficient control.