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Check this document:<br>
<a href="http://www.bkbiz.net/Website/BMEA/Underfloor%20Air%20Distribution.pdf" eudora="autourl">
http://www.bkbiz.net/Website/BMEA/Underfloor%20Air%20Distribution.pdf<br>
<br>
<br><br>
</a><blockquote type=cite class=cite cite="">We have this historic
building that we are renovating and are considering underfloor air
distribution. The space is a high bay space (around 50 feet tall) that
will be occupied by students with computers. The design currently has an
access floor 6 above the existing floor. We are thinking of raising it a
little more and running the supply air through underfloor ducts (we cant
do a plenum because of the condition of the existing floor). <br>
<br>
As far as I can tell the energy benefits of the underfloor air system
are:<br>
<br>
1. Higher supply air temperature
(68F)<br>
2. Lower static pressure <br>
3. Stratification (lights, equipment
and people heat stratifies above the return air grills. <br>
<br>
The alternate is a supply duct that throws air across the space (60 feet
wide) from a height of 20 feet. <br>
<br>
So my questions are:<br>
<br>
1. If the UFAD goes through ducts (as
opposed to a plenum) is the reduced static pressure realistic? How much
would you expect to see it reduce by?<br>
2. How much stratification can you
expect here? I assume there is a radiant portion from these things in
addition to the convective portion. Would a 50% reduction in the sensible
loads be realistic? I know the normal procedure would be to assign the
rest of the loads to the return plenum, but it this case the return will
be ducted at 8, while the warm air will be allowed to plume up to 50.
Does that change things?<br>
3. I assume I should model the upper
part of the zone as a plenum. In which case does the upper plenum start
at 20 for the alternate system (spiral duct at 20), and at 8 for
the UFAD?<br>
<br>
All responses are appreciated<br>
<br>
Thanks<br>
<br>
<b>Vikram Sami,</b> LEED AP <br>
Direct Phone 404-253-1466 | Direct Fax 404-253-1366 <br>
<b>LORD, AECK & SARGENT ARCHITECTURE<br>
</b>1201 Peachtree Street NE, Suite 300, Atlanta, GA 30361 <br>
Responsive Design · Technological Expertise · Exceptional Service <br>
Please visit our new website |
<a href="file:///\\www.lordaecksargent.com\">www.lordaecksargent.com</a>
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