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<DIV><FONT face=Arial size=2>John,</FONT></DIV>
<DIV><FONT face=Arial size=2>I have tried working around this in a number of
ways and on a number of projects over the years. While every project is
unique, the best approximation in my opinion is to use the OA-FROM-SYSTEM
command which passes return air (properties only not mass flow) from one system
to another. You assign the make up air system to a dummy zone with no
loads and then need to control your supply temperature off a reset
schedule. Two problems / limitations are:</FONT></DIV>
<DIV><FONT face=Arial size=2>1) if your desired make up air temperature cannot
be simplified to an outdoor air reset schedule then inaccuracies arise. in
this case run a couple of tests to bound the uncertainty.</FONT></DIV>
<DIV><FONT face=Arial size=2>2) if your tempering unit has bypass dampers
to dehumidify while keeping dry bulb temperature elevated then this cannot be
accurately represented in this case</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>If you are working in 2.1E and are familiar /
adventurous with INPUT-FUNCTIONS then in theory you have ways to get around the
problems above, but ...</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I understand that Jeff Hirsch and gang may be
working on adding in a better representation of minimum outdoor air / fresh air
/ make-up air systems.</FONT></DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2>Graham</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=JAulbach@semprasolutions.com
href="mailto:JAulbach@semprasolutions.com">Aulbach, John</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=BLDG-SIM@gard.com
href="mailto:BLDG-SIM@gard.com">BLDG-SIM@gard.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, June 19, 2004 3:07
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [BLDG-SIM] DOE-2 help ( I KNOW I
have seen this before)..</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2><SPAN class=479020317-18062004>I did such a DOE-2
run years ago, but now have forgotten how to do it.</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=479020317-18062004></SPAN></FONT> </DIV>
<DIV><FONT face=Arial size=2><SPAN class=479020317-18062004>A building has
outside air supplied by a tempering Makeup air (MAU) unit (could be
anything-CHW or Package) to a plenum. All other building system draw from and
return air to this plenum. The MAU has an economizer on it (or
not).</SPAN></FONT></DIV>
<DIV><FONT face=Arial size=2><SPAN
class=479020317-18062004></SPAN></FONT> </DIV>
<DIV><FONT size=+0><SPAN class=479020317-18062004></SPAN></FONT><FONT
face=Arial color=#0000ff size=2><SPAN class=479020317-18062004>Does anyone
have an example DOE-2 SYSTEMS input for this situation?</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=479020317-18062004></SPAN></FONT> </DIV>
<DIV><SPAN class=479020317-18062004></SPAN><FONT color=#0000ff><FONT
face=Arial size=2><SPAN class=479020317-18062004>Thanks in
advance.</SPAN></FONT></FONT></DIV>
<DIV><STRONG><FONT size=+0><FONT color=#0000ff><FONT size=4><SPAN
class=479020317-18062004></SPAN></FONT></FONT></FONT></STRONG> </DIV>
<DIV><STRONG><FONT size=+0><FONT color=#0000ff><FONT size=4><SPAN
class=479020317-18062004></SPAN></FONT></FONT></FONT></STRONG> </DIV>
<DIV><STRONG><FONT size=+0><FONT color=#0000ff><FONT size=4><SPAN
class=479020317-18062004></SPAN>John R. Aulbach, PE,
CEM</FONT></FONT></FONT></STRONG></DIV>
<DIV><FONT size=2><STRONG>Project Engineer</STRONG></FONT></DIV>
<DIV><FONT size=2><STRONG>Sempra Energy Solutions</STRONG></FONT></DIV>
<DIV><FONT size=2><STRONG>555 West Fifth Street</STRONG></FONT></DIV>
<DIV><FONT size=2><STRONG>Mail Location 27F3</STRONG></FONT></DIV>
<DIV><FONT size=2><STRONG>Los Angeles, CA 90013</STRONG></FONT></DIV>
<DIV><FONT size=2><STRONG>Tel: (213) 244-8551 Cell (213)
219-4875</STRONG></FONT></DIV>
<DIV><STRONG><FONT size=2></FONT></STRONG> </DIV>
<P align=left><B><FONT face="Courier New" size=1>"Sempra Energy Solutions is
not the same company as SDG&E/ SoCalGas, the Utilities. Sempra
Energy Solutions is not regulated by the California Publi</FONT><FONT
face="Courier New" size=1>c Utilities Commission, and you do not have to buy
Sempra Energy Solutions products or services to continue to receive quality
regulated service from the Utilities." </FONT></B></P>
<DIV> </DIV><PRE>
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