<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Message</TITLE>
<META http-equiv=Content-Type content="text/html; charset=us-ascii">
<META content="MSHTML 6.00.2900.2873" name=GENERATOR></HEAD>
<BODY>
<DIV><SPAN class=298180714-05062006><FONT face=Arial color=#0000ff size=2>there
is a variable for exhaust fans at either the zone level or the system level -
that might help.</FONT></SPAN></DIV>
<DIV><SPAN class=298180714-05062006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=298180714-05062006><FONT face=Arial color=#0000ff size=2>-
Rohini</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV> </DIV><!-- Converted from text/plain format -->
<P><FONT size=2>--------------------------------------------<BR>Rohini Brahme,
Ph.D.<BR>Research Scientist<BR>Energy & Building Solutions Group<BR>Houston
Advanced Research Center<BR>4800 Research Forest Drive<BR>The Woodlands, TX
77381<BR><BR>Ph: 281-364-6006<BR>Fax: 281-364-6052<BR><BR></FONT></P>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
bldg-sim@gard.com [mailto:bldg-sim@gard.com] <B>On Behalf Of </B>Thomas
White<BR><B>Sent:</B> Saturday, June 03, 2006 10:10 PM<BR><B>To:</B>
bldg-sim@gard.com<BR><B>Subject:</B> [bldg-sim] need a reality check for
modeling fan energy of a 100% CV reheat system<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>Hello
everyone:</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>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></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>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></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>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></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=722075902-04062006>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></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006>...Tom</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN
class=722075902-04062006></SPAN></FONT> </DIV>
<DIV><SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><STRONG>Thomas J.
White, P.E.</STRONG></SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><BR></SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Associate</SPAN></SPAN></DIV>
<DIV><SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Lead Engineer,
Energy Services</SPAN></SPAN></DIV>
<DIV><SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">LEED<SUP>®</SUP> Accredited
Professional</SPAN></SPAN></SPAN></SPAN></SPAN></DIV>
<DIV><BR><A href="http://www.glumac.com/"><IMG
src="http://www.glumac.com/glumacsig.gif" border=0 NOSEND="1"></A> </DIV>
<DIV>
<HR style="WIDTH: 330px; HEIGHT: 2px" align=left width=330 color=#9acb33
noShade SIZE=2>
</DIV>
<DIV></DIV>
<DIV><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">320 SW
Washington, Suite 200</SPAN><BR><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">Portland,
OR 97204-2640</SPAN><BR><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">T.
503.227.5280<SPAN style="mso-spacerun: yes"> </SPAN>F.
503.274.7674 D. 503-345-6246<BR><BR><STRONG><SPAN
style="FONT-SIZE: 10pt; COLOR: #333333; FONT-FAMILY: Arial">Thinking. Inside
the building.</SPAN></STRONG><BR><STRONG><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 10pt; COLOR: #333333; FONT-FAMILY: Arial"><A
href="http://www.glumac.com/"><FONT
color=#0000ff>http://www.glumac.com</FONT></A></SPAN></STRONG></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><STRONG><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 10pt; COLOR: #333333; FONT-FAMILY: Arial"><FONT
color=#000000></FONT></SPAN></STRONG></SPAN> </DIV>
<DIV><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><STRONG><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 10pt; COLOR: #333333; FONT-FAMILY: Arial"></SPAN></STRONG></SPAN> </DIV>
<DIV> </DIV><PRE>
==================
You received this e-mail because you are subscribed
to the BLDG-SIM@GARD.COM mailing list. To unsubscribe
from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@GARD.COM
</PRE></BLOCKQUOTE><PRE>
===========================
You received this e-mail because you are subscribed
to the BLDG-SIM@GARD.COM mailing list. To unsubscribe
from this mailing list send a blank message to
BLDG-SIM-UNSUBSCRIBE@GARD.COM
</PRE></BODY></HTML>