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How to vary the air flow rate and fan power based on variation in AHU cooling load?

My model is a single-zone system with a single air terminal unit (VAV) supplied by a fan (VAV). Autosizing is completely removed from the code. I cannot see any variation in fan power and supply air flow rate with respect to sensible cooling load variation. Loads (people, equipment) are not present. The current simulation is running successfully.