[bldg-sim] VAV control of underfloor air

["Robert Lord" <rgl.lsbris@xxxxxxxxxxxxxxx>]

A typical design is to zone the floor compartment according to aspect and allow the individuals to adjust the swirls.
There are only a handful of large VAVs and the fan speed is varied according to duct static pressure (not plenum pressure).

In most instances, I have found that the internal rate of return is between 30% & 50% and hence is a good investment. I am sure VSD pricing and energy pricing varies but a point to note is that the RH control is improved.

Good luck!

Rob Lord


-----Original Message-----
From: Molinini, Louis [mailto:lmolinini@xxxxxxxxx]
Sent: Saturday, 2 November 2002 8:37 AM
To: bldg-sim@xxxxxxxx
Subject: [bldg-sim] VAV control of underfloor air


Do any of you out there have any experience designing an underfloor air
system with VAV control.  The particular system I am looking at is a plenum
based system with manually adjustable swirl diffusers (Titus/Krantz).  I am
curious if it ends up operating like a constant volume system or is it worth
the expense of installing the freq drive and the Static pressure sensor or
differential pressure sensor.  Any help is greatly appreciated.
Thanks,
Louis

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