Question-and-Answer Resource for the Building Energy Modeling Community
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I can suggest an idea...
Your Cooling Towers would be on the supply side of a plant loop, on parallel branches. Then it mixes via the PlantLoop Mixer, goes to the demand side, at which point you just place a WaterHeater:Mixed (or WaterHeater:Stratified).
That WaterHeater:Mixed is then on the supply side of another plant loop, and on the demand side you place all three chillers in parallel (their condenser nodes). The Pump for that loop can be "virtual" with a very low pressure rise and almost 0 power used.
The three chillers are then on the supply side of the Chilled water loop (evaporator side), serving the building load.
Here's a showcase of my Pinta (Paint) skills:
An alternative may be to use just two loops and to manually set a large Plant Loop Volume for the PlantLoop "condenser water loop".
