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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m trying to use eQuest to compare an Underfloor Air System
and conventional VAV system. I have modeled the Underfloor case according
to the Addison/Nall paper, and am having some issues with the return air
temperatures. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have modeled two stratified zones (a lower occupied 5’
zone, and an upper 8’ plenum space). A portion of the internal
gains and window conduction is modeled in the plenum space, and the return air
path is set to PLENUM. I expected a portion of the cooling loads to be
transferred to the return air, raising the return air temperatures, and allowed
the loads in the occupied zone to be met with a higher supply air temp (SAT).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>However, when I increase my SAT for the underfloor case, my
cfm and fan energy increases accordingly. I output hourly return air
temps for the two cases and found that they were the same – adding heat
gains to the plenum space did not increase the return air temps. Further,
I adjusted my heating and cooling setpoints for the zones, and found that the return
air temps are equal to these zonal setpoints, regardless of what load is
imposed on the plenum spaces.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Has anyone experienced this problem? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Kendra<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p><b><font size=3 color="#333333" face=Arial><span style='font-size:12.0pt;
font-family:Arial;color:#333333;font-weight:bold'>Kendra Tupper</span></font></b>
<br>
<i><font color=gray face=Arial><span style='font-family:Arial;color:gray;
font-style:italic'>LEED® AP</span></font></i><b><span style='font-weight:
bold'> </span></b>
<br>
<b><sup><font color="#333333" face="Arial Bold"><span style='font-family:"Arial Bold";
color:#333333;font-weight:bold'> FLACK</span></font> </sup></b><b><sup><font
color="#999999" face="Arial Bold"><span style='font-family:"Arial Bold";
color:#999999;font-weight:bold'>+</span></font> </sup></b><b><sup><font
color="#333333" face="Arial Bold"><span style='font-family:"Arial Bold";
color:#333333;font-weight:bold'>KURTZ</span></font></sup></b> <b><sub><span
style='font-weight:bold'> </span></sub></b><br>
<font size=2 color="#333333" face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:#333333'>405 Howard
Street </span></font>
<font size=2 color="#333333" face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:#333333'>415.398.3833</span></font><b><span
style='font-weight:bold'> </span></b><b><font size=2 color="#333333"
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:#333333;
font-weight:bold'>Main</span></font></b> <br>
<font size=2 color="#333333" face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:#333333'>Suite 500 </span></font>
<font size=2 color="#333333"
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:#333333'>415.402.5840</span></font><b><span
style='font-weight:bold'> </span></b><b><font size=2 color="#333333"
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:#333333;
font-weight:bold'>Direct</span></font></b> <br>
<font size=2 color="#333333" face=Arial><span style='font-size:10.0pt;
font-family:Arial;color:#333333'>San Francisco, CA 94105</span></font>
<font size=2 color="#333333"
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:#333333'>415.433.5311</span></font><b><span
style='font-weight:bold'> </span></b><b><font size=2 color="#333333"
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:#333333;
font-weight:bold'>Fax</span></font></b> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><a
href="http://www.flackandkurtz.com">http://www.flackandkurtz.com</a> <u>
</u></span></font><a href="mailto:kendra.tupper@sf.fk.com"><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>kendra.tupper@sf.fk.com</span></font></a>
<br>
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