[TheSpiceIsLife]

Industrial refrigeration components are very modular, controllers capable of handling this sort of set up are available off the shelf.

The whol set up is pretty much identical to a chilled water data centre cooling set up but with a smaller chiller and a larger chilled water reservoir.

Ammonia would probably be better, I was just thinking on terms of something a fregierstion mechanic could hack together as a proof of concept in a couple of weekends.