[bldg-sim] VAV control of underfloor air
Robert Lord
rgl.lsbris at lincolne.com.au
Sun Nov 3 14:54:58 PST 2002
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 at syska.com]
Sent: Saturday, 2 November 2002 8:37 AM
To: bldg-sim at gard.com
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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