I'm trying to simulate an AHU, which modulates its fan speed due to the sensible heat gains from the zones. The AHU should use its own heating and cooling coil without any reheat in the zone (there is no other HVAC equipment there, like FanCoils or radiators)

As far as i know, for this purpose i should use VAV instead of CAV, but when check the fan's Mass Flow Rate it's linear - not modulating at all...

Am I understanding wrongly these systems?

Hi!

I'm trying to simulate an AHU, which modulates its it's fan speed due to the sensible heat gains from the zones. The AHU should use its it's own heating and cooling coil without any reheat in the zone (there is no other HVAC equipment there, like FanCoils or radiators)

As far as i know, for this purpose i should use VAV instead istead of CAV, but when check the fan's Mass Flow Rate it's linear - not modulating at all...

Am I understanding understood wrongly these systems?