<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.5730.11" name=GENERATOR></HEAD>
<BODY>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT size=2><SPAN
class=975314520-19112007><FONT
color=#0000ff>Taylor,</FONT></SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT size=2><SPAN
class=975314520-19112007><FONT
color=#0000ff></FONT></SPAN></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT size=2><SPAN
class=975314520-19112007><FONT color=#0000ff>On pages 431-432 of
the</FONT></SPAN> <SPAN class=975314520-19112007><FONT color=#0000ff>DOE2.2
Vol. 2 Dictionary manual, under the definition for the keyword OUTSIDE-AIR-FLOW,
is in part the following statement:</FONT></SPAN></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT color=#0000ff
size=2><SPAN class=975314520-19112007></SPAN></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT><FONT color=#0000ff
size=2><SPAN class=975314520-19112007>"... Note that specifying outside
ventilation air at the zone level takes precedence over specifying it at the
system level</SPAN></FONT></FONT><FONT color=#0000ff><FONT size=2>.<SPAN
class=975314520-19112007>"</SPAN></FONT></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT color=#0000ff><FONT
size=2><SPAN class=975314520-19112007></SPAN></FONT></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT color=#0000ff><FONT
size=2><SPAN class=975314520-19112007>This has tripped me up more than once...
basically it's saying be sure to remove all outside air assignments at the zone
level, either per person or per square foot, else whatever you do at the system
level is ignored.</SPAN></FONT></FONT></FONT></DIV>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT color=#0000ff><FONT
size=2><SPAN class=975314520-19112007></SPAN></FONT></FONT></FONT> </DIV>
<DIV dir=ltr align=left><FONT face="Courier New"><FONT color=#0000ff><FONT
size=2><SPAN class=975314520-19112007>HTH...</SPAN></FONT></FONT></FONT></DIV>
<DIV align=left>
<DIV align=left><FONT face=Arial size=2></FONT> </DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT color=#000000>Brandon Nichols,
PE, LEED<SUP><SPAN style="FONT-SIZE: 8pt">®</SPAN></SUP>
AP</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT
color=#000000>Mechanical</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#000080><STRONG>HARGIS ENGINEERS</STRONG></FONT></DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>600 Stewart Street</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>Suite 1000</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>Seattle, WA 98101<?xml:namespace prefix = o ns =
"urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>www.hargis.biz<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151> <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">d
|</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
206.436.04<SPAN class=212011020-11052004>0</SPAN>0<SPAN
style="mso-spacerun: yes"> </SPAN><B>c | </B>206.<SPAN
class=212011020-11052004>228.8707</SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004></SPAN></SPAN><FONT color=#515151><B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">o
|</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">
206.448.3376<SPAN style="mso-spacerun: yes"> </SPAN><B>f <SPAN
style="mso-spacerun: yes"> </SPAN>|</B>
206.448.4450</SPAN></FONT></P></SPAN></SPAN>
<DIV> </DIV></DIV>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Kathryn Lee<BR><B>Sent:</B>
Friday, November 16, 2007 6:41 PM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] eQuest 100%
OA<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>I am modeling a 100% OA system for a hospital to compare the energy
usage of constant volume and variable volume. I have entered in the appropriate
OA minimum air change rates specified by code and am currently using the
"Variable Air Volume" system type to model both systems. The only change that I
am making between the two systems is the Min-Flow-Ratio; for CV it is set to 1.0
and for VAV it is set to 0.2 (we are using high turndown Phoenix valves). </DIV>
<DIV> </DIV>
<DIV>Our results are showing that the system is recirculating air. We have set
OA economizer control as "fixed fraction" and 1.0 and have created a
"min-air-sch" for ventilation air that is always set at 1.0. We have also tried
setting the economizer control as "drybulb" and setting the boundary conditions
to 100°F and 20°F. </DIV>
<DIV> </DIV>
<DIV>Do you have any suggestions regarding how to prevent recirculation? We
still need to be able to define OA minimums for code compliance.</DIV>
<DIV> </DIV>
<DIV>Thanks for the help.</DIV>
<DIV> </DIV>
<DIV>Taylor</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></BODY></HTML>