Plant-scale water removal and multi-unit lines. At this scale the machine is the easy part of the conversation and the room is the hard part.
It is a labour and risk decision more than a physics one.
Above a certain annual water load the question stops being which system and becomes how many, arranged how. Multiple units let you stagger loading and unloading so labour is level across a shift rather than spiking twice a day, and a service event costs a fraction of capacity instead of all of it.
Against that, one large system is usually simpler on utilities and floor space. The water load sets the total; the operation decides the arrangement.
Electrical service, heat rejection, vacuum. Get these wrong and equipment waits on contractors.
Electrical service has to carry real running load with refrigeration and vacuum together, not nameplate. Heat rejection has to go somewhere deliberate — indoors it becomes an HVAC load, outdoors it becomes a siting and noise question. Vacuum pumps need siting, oil management and exhaust, and they are loud and hot.
All three are cheaper to decide before the slab than after the purchase order. That is facility build-out.
When a customer asks about a batch from four months ago, someone has to answer.
Every system runs on Siemens control architecture with Sublon technology tracking the freeze-drying process. Across multiple units that becomes a floor-level view — where each machine is in its cycle, what the condenser load looks like, where the next batch should go — and a per-batch record that exists when it is needed.