How to model chiller part-load in CFD with hot standby units?

Hi everyone, I’m using Cadence Reality DC Advanced to simulate an air-cooled chiller plant. The building load is capped at 80%, and all chillers (including standby) are running to share that load.
Questions:

Represent part-load heat rejection at condenser coils?
Model fan speed control when the software uses chilled water supply temperature as the control basis?
Any best practices for distributing load across multiple chillers in this scenario?

Looking for tips or workflows—thanks!