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<p class=MsoNormal>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 can’t do a plenum because of the condition of the
existing floor). <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>As far as I can tell the energy benefits of the underfloor
air system are:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Higher supply air temperature (68F)<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]> Lower static pressure <o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Stratification (lights, equipment and people heat
stratifies above the return air grills. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The alternate is a supply duct that throws air across the
space (60 feet wide) from a height of 20 feet. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>So my questions are:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>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?<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>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?<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>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?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>All responses are appreciated<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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