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<DIV dir=ltr align=left><SPAN class=098040215-26022010><FONT face=Arial
color=#0000ff size=2>Vikram,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=098040215-26022010><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=098040215-26022010><FONT face=Arial
color=#0000ff size=2>When you use a sizing ratio of 2, you're oversizing the
system by 100% while the loads stay at 1/2 of what they should be. This is not
what you want.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=098040215-26022010><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=098040215-26022010><FONT face=Arial
color=#0000ff size=2>Depending on the system type, using a single unit with
52,000 cfm can affect the results because of the different load
diversity.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=098040215-26022010><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=098040215-26022010><FONT face=Arial
color=#0000ff size=2>Kamel Haddad</FONT></SPAN></DIV><BR>
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<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Vikram
Sami<BR><B>Sent:</B> February 24, 2010 17:22<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] System
multiplier<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>I’m modeling a building with multiple zones per floor. Each
floor is supplied by two identical air handlers supplying 26,000 cfm each. I
would like to model it as a single system. Should I:<o:p></o:p></P>
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style="mso-list: Ignore">1.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Model a single AHU with 26,000 cfm and assign it a
multiplier of 2 (system sizing ratio)<o:p></o:p></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="mso-list: Ignore">2.<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN><![endif]>Model a single AHU with 52,000 cfm without the sizing
ratio (sizing ratio 1). <o:p></o:p></P>
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style="mso-list: Ignore">3.<SPAN
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</SPAN></SPAN><![endif]>Model both air handlers (would prefer not to).
<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
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