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<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'>Tom, there are several ways to accomplish
this.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'>Use a VAV system with return fans and set
the economizer to 100% OA<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'>You could also set the specifics of the
exhaust system as a dedicated exhaust, but watch the fan power on this one.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'>You could also increase fan static pressure
to emulate two fans.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=red face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:red'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 color=red face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:red'>Peter Simmonds Ph.D.</span></font><font
color=red><span style='color:red'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=red face=Arial><span style='font-size:
12.0pt;font-family:Arial;color:red'>Associate</span></font><font color=red><span
style='color:red'><br>
</span></font><font size=1 color=gray face=Arial><span style='font-size:7.5pt;
font-family:Arial;color:gray'>IBE Consulting Engineers</span></font><font
color=red><span style='color:red'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=1
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color:gray'>14130 Riverside Drive Suite 201</span></font></st1:address></st1:Street><font
color=red><span style='color:red'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:City w:st="on"><st1:place w:st="on"><font size=1
color=gray face=Arial><span style='font-size:7.5pt;font-family:Arial;
color:gray'>Sherman</span></font></st1:place></st1:City><font size=1
color=gray face=Arial><span style='font-size:7.5pt;font-family:Arial;
color:gray'> Oaks, CA 91423<br>
p: (818) 377-8220<br>
f: (818) 377-8230<br>
m: (818) 219-1284<br>
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<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim@gard.com [mailto:bldg-sim@gard.com] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Thomas White<br>
<b><span style='font-weight:bold'>Sent:</span></b> Saturday, June 03, 2006 8:10
PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@gard.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> [bldg-sim] need a reality
check for modeling fan energy of a 100% CV reheat system</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Hello everyone:</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I'm modeling a 400,000 sf hospital
with 100% outside air and constant volume reheat system. The priority is
infection control and not energy savings, so the total ventilation load is
HUGE. </span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Here's my question. I've
input all the CFM values for each supply air handler (about 500,000 cfm
combined), but -- strictly speaking -- there is no return air since all air is
exhausted. So, how do I account for the kWh of all the exhaust air handlers?
The exhaust air handlers run about 2/3 the CFM of the supply air, with the
difference made up by exfiltration and a multitude of special-purpose exhaust
fans (in the labs and so on).</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I figure my only real option is to
treat the exhaust air handlers as electric loads in the building. They don't
contribute to the heating and cooling loads, but they are a significant energy
use.</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Can you think of an alternate way to
model exhaust air fans to account for their energy use while eliminating any
energy use for return fans?</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>...Tom</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><strong><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Thomas J. White, P.E.</span></font></b></strong><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><br>
</span></font><font size=2 face=Arial><span style='font-size:10.0pt;font-family:
Arial'>Associate</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Lead Engineer, Energy Services</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>LEED<sup>®</sup> Accredited
Professional</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><br>
<a href="http://www.glumac.com/"><span style='text-decoration:none'><img
border=0 width=339 height=37 id="_x0000_i1025"
src="http://www.glumac.com/glumacsig.gif"></span></a><o:p></o:p></span></font></p>
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<hr size=2 width=330 style='width:247.5pt' noshade color="#9acb33" align=left>
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<div>
<p class=MsoNormal style='margin-left:.5in'><font size=1 face=Arial><span
style='font-size:9.0pt;font-family:Arial'>320 SW Washington, <st1:address
w:st="on"><st1:Street w:st="on">Suite</st1:Street> 200</st1:address></span></font><br>
<st1:place w:st="on"><st1:City w:st="on"><font size=1 face=Arial><span
style='font-size:9.0pt;font-family:Arial'>Portland</span></font></st1:City><font
size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'>, <st1:State
w:st="on">OR</st1:State> <st1:PostalCode w:st="on">97204-2640</st1:PostalCode></span></font></st1:place><br>
<font size=1 face=Arial><span style='font-size:9.0pt;font-family:Arial'>T.
503.227.5280 F. 503.274.7674 D. 503-345-6246<br>
<br>
</span></font><strong><b><font size=2 color="#333333" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333333'>Thinking. Inside the
building.</span></font></b></strong><font size=1 face=Arial><span
style='font-size:9.0pt;font-family:Arial'><br>
</span></font><strong><b><font size=2 color="#333333" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333333;font-weight:normal'><a
href="http://www.glumac.com/">http://www.glumac.com</a></span></font></b></strong><o:p></o:p></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
</div>
<pre style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre
style='margin-left:.5in'><font size=2 face="Courier New"><span
style='font-size:10.0pt'>==================<o:p></o:p></span></font></pre><pre
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