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<div class=Section1>
<p class=MsoNormal><span style='color:#1F497D'>The study uses both: ducted
return in open plenums and plenum return for suspended ceilings.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Paul Hay<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Managing Partner<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>PAUL HAY Consultants<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><i><span style='color:#1F497D'>Capital Project Planning and
Management<o:p></o:p></span></i></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>15a Cassia Park Road<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Kingston 10<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Jamaica, W.I.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>tel: 1 (876) 756-0631<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>cel: 1 (876) 324-4274<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>fax: 1 (876) 756-0631<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>web: www.phcjamaica.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>e-mail: paul.hay@phcjamaica.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Steve Tobin
[mailto:stobin@smithboucher.com] <br>
<b>Sent:</b> Thursday, January 08, 2009 10:23 AM<br>
<b>To:</b> phay@phcjamaica.com<br>
<b>Subject:</b> RE: [Bldg-sim] Suspended ceilings vs. open plenums<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='color:#1F497D'>Does your model include ducted
return or plenum return? If it is ducted return the return air is pulled
from the space and the light heat gain is less load for the AHU. If you
have a plenum return the full lighting load should be accounted for.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><img width=119 height=37
id="Picture_x0020_1" src="cid:image001.jpg@01C97172.B346C5A0"><o:p></o:p></span></p>
<p class=MsoNormal style='margin-top:6.0pt'><b><span style='font-size:14.0pt;
font-family:"Avenir 55";color:#2D4D5E'>Steve Tobin<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:8.0pt;font-family:"Avenir 55";
color:#CC9900'>PROJECT ENGINEER<o:p></o:p></span></p>
<p class=MsoNormal style='margin-top:12.0pt'><span style='font-family:"Avenir 55";
color:#2D4D5E'>25501 west valley parkway</span><span style='font-size:10.0pt;
font-family:"Avenir 55";color:#2D4D5E'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Avenir 55";color:#2D4D5E'>olathe
ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Avenir 55";color:#2D4D5E'>direct
913 344.0061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Avenir 55";color:#2D4D5E'>fax 913
345.0617<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>P. Hay<br>
<b>Sent:</b> Thursday, January 08, 2009 9:19 AM<br>
<b>To:</b> BLDG-SIM<br>
<b>Subject:</b> [Bldg-sim] Suspended ceilings vs. open plenums<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hi all,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I recently came across a Life Cycle Analysis of Suspended
Ceilings vs. Open Plenums, initiated by CISCA [Ceiling and Interior System
Construction Association ( <a href="http://www.cisca.org">www.cisca.org</a> )]
which concluded that suspended ceilings are more energy efficient because they
have:<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'>a)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>higher reflectances,<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>b)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>better heat-removal from luminaires, and<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>c)<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>use lower static pressure and fan power.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I can understand (a) and (c) but (b) leaves me suspicious
that the return-air plenum was not considered in this study. As I
understand it, return-air plenums can be defined as separate zones from the
usable spaces (in this case: an office or a food store) but the suspended
ceilings are adiabatic. So , other than the savings for lighting and fan,
I really don’t understand how there could be significant savings for the
HVAC system if the overall height of the rooms (plenum & usable space) is
identical, and cooling load of plenums are considered. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Is there something I’m missing?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Paul Hay<o:p></o:p></p>
<p class=MsoNormal>Managing Partner<o:p></o:p></p>
<p class=MsoNormal>PAUL HAY Consultants<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><i>Capital Project Planning and Management<o:p></o:p></i></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>15a Cassia Park Road<o:p></o:p></p>
<p class=MsoNormal>Kingston 10<o:p></o:p></p>
<p class=MsoNormal>Jamaica, W.I.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>tel: 1 (876) 756-0631<o:p></o:p></p>
<p class=MsoNormal>cel: 1 (876) 324-4274<o:p></o:p></p>
<p class=MsoNormal>fax: 1 (876) 756-0631<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>web: www.phcjamaica.com<o:p></o:p></p>
<p class=MsoNormal>e-mail: paul.hay@phcjamaica.com<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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