Variable Volume and Temperature (VVT) system sizing.

[jamesedison]

What happens to a VVT system if the zone boxes are oversized for acoustical sound reasons? Will the system be controlable?

 

[KiwiMace]

Suggest you post to the HVAC/R Engineering forum.

Depends on how much they are oversized. This is a damper control with reheat - Flow will present the most issues. If the required flow is say only 25% of the capacity you will end up with real issues trying to get controllable airflows and space temps, at 75% it will probably work, or at least most of the time.

I recommend using a correctly sized box, as they typically all are capable of meeting reasonable specs (say NC35) and treating the noise as it's own mech/arch problem - Choice of box manufacturer, Acoustic rated ceiling tiles, lead-impregnated vinyl sheets around boxes, full height partitions, insulating boxes...

 

[HVACctrl]

It can be aproblem if they are sized too large. The modulating damper could act like a two position damper instead. Barely open could provide full flow for example.

The HVAC forum might be more helpful as mentioned above.

Ed

http://www.engineerboards.com