You need to ask the facility people what temperature they want on the supply water, and, what temperature rise they can live with on the return temperatures.

They may even be able to tell you the maximum flow rate (on average) per mould size/shape. You need the temperature differences to help establish the maximum cooling loads for the maximum flow rates. Then you can size the chiller(s).

Most of these facilities use temperatures higher than normal comfort cooling applications so you wan to be sure to have the chiller rated for the actual operating conditions, NOT those for air conditioning.

I might also suggest the installation of a permanent strainer in the water lines to the chiller. You don't want to plug it up with old debris found in the existing system.