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Air loop cooling energy is much bigger than plant loop cooling energy

I am studying several energy conservation measures to the model PAU+FCU with chilled water loop.
When I change the plant loop configuration from PrimaryConstantSecondaryVariable to PrimaryVariableNoSecondary, I found that there are big difference between plant loop cooling energy and air loop cooling energy as shown below.
plant loop cooling energy:14999.5MWh
Air loop cooling energy:18102.3MWh
Can anyone tell me what could cause this situation?