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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Nick,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In your corrected you would have 300 cfm available for the heat
recovery but I read your intent to be heat recovery on 200 cfm of exhaust.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Would you be better to specify 100 cfm of zone level exhaust to
get a 200 cfm system level exhaust to recover from?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Check and/or manipulate your schedules and static pressures too.
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Paul Riemer</span><span style='font-size:10.0pt;font-family:
"Verdana","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";
color:#1F497D'>Dunham<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Nick
Caton<br>
<b>Sent:</b> Wednesday, March 17, 2010 9:44 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] System-Level Exhaust??? How?<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Brian/Carol, thanks very much for your replies!<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>I’d like to spell out a simple example to both
illustrate the concept and verify my understanding:<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><u>Starting System Flows (CFM):<o:p></o:p></u></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>1,000 Supply Air<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>300 Outside Air<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>200 Exhaust Air, specified at a the zone(s) level.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>800 Return Air<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>To correctly model energy recovery with this system, we need
to remove the 200 CFM zonal-specified exhaust, and add it to the return air
stream.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><u>Energy-recovering System, corrected:<o:p></o:p></u></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>1,000 Supply Air<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>300 Outside Air<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>1000 Return Air<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Am I understanding this correctly?<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Thanks again!<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><br>
~Nick<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><img width=119 height=37 id="_x0000_i1025"
src="cid:image001.jpg@01CAC5B8.258A37B0" alt="cid:489575314@22072009-0ABB"><b><o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b><o:p> </o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>NICK CATON, E.I.T.<o:p></o:p></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>PROJECT ENGINEER<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>25501 west valley parkway<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>olathe ks 66061<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>direct 913 344.0036<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>fax 913 345.0617<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><i>Check out our new web-site @ </i><a
href="www.smithboucher.com">www.smithboucher.com</a><u> </u><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>From:</b> Brian Fountain [mailto:bfountain@greensim.com] <br>
<b>Sent:</b> Tuesday, March 16, 2010 10:10 PM<br>
<b>To:</b> Nick Caton<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] System-Level Exhaust??? How?<o:p></o:p></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Nick,<br>
<br>
DOE-2 enforces a mass balance at the system level. Whatever OA that is
not exhausted at the zone level must be returned to the central system and
exhausted through your heat recovery device. By defining the OA volume flow
rate, you are also defining the exhaust volume flow rate.<br>
<br>
Nick Caton wrote: <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>I need have an ERV which moves all the exhaust and supplies
conditioned OA to 2 of 3 FPVAV air handlers. I’ve specified the
appropriate enthalpy wheel specifics at the two affected PIU systems,
maintaining identical efficiency properties and breaking down CFM’s and
fan/auxiliary power figures by weighting each by the supplied OA amount.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>I understand from the help files that zonally-specified
exhaust air does not play into heat-recovery, when we specify energy recovery
at the system level (help section is copied below and highlighted for
reference).<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>I take it then I’m supposed to zero out all zonally
entered exhaust air flows, sum up the flows and add at the system level…
but then <u>how/where do I specify system-level exhaust CFM rates</u>? <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>I’ve tried to enter
EXHAUST-FLOW = #### under the
systems in question in the .inp file, but it introduces the following error: <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>*13131*
EXHAUST-FLOW = 2550<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>*ERROR********* ============
*****************************************************************UNKNOWN
KEYWORD or PREVIOUS .. MISSING <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>More errors ensue, and a long string of things appear to be
defaulted/lost when I continue to open the file… something is obviously
wrong with this approach.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b> </b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><img border=0 width=119 height=37 id="_x0000_i1026"
src="cid:image001.jpg@01CAC5B8.258A37B0" alt="cid:489575314@22072009-0ABB"><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b> </b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>NICK CATON, E.I.T.</b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>PROJECT ENGINEER<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>25501 west valley parkway<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>olathe ks 66061<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>direct 913 344.0036<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>fax 913 345.0617<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><i>Check out our new web-site @ </i><a
href="www.smithboucher.com">www.smithboucher.com</a><u> </u><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>EXHAUST-FLOW</b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Flow rate of the zone's exhaust fan. This entry can be
omitted if there is no exhaust from the zone, if there is only central exhaust
by way of the system return, or if the exhaust tracks the supply flow (see
AIRFLOW-TRACKING). If specified, EXHAUST-STATIC should also be entered. The
exhaust fan may be either constant flow or variable flow. <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>If exhaust air make-up is via the air handler (EXHAUST-SOURCE
= AIR-HANDLER), then the exhaust fan can operate only only when the system
supply and return fans operate (see SYSTEM:FAN-SCHEDULE or
SYSTEM:EXHAUST-FAN-SCH).<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>The SYSTEMS program simulates heat recovery from central
exhaust only, not from zone exhaust. If heat is to be recovered, zone exhaust
should not be entered but rather allowed to default to the central system.
Return fan static should be adjusted, on a weighted average basis, to reflect
zone exhaust fan conditions. <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>The program will not allow SYSTEM:MIN-OUTSIDE-AIR to be less
than the sum of EXHAUST-FLOWs for all zones divided by the sum of supply flows
for all zones. That is, MIN-OUTSIDE-AIR will not restrict the operation of
exhaust fans. The exception is when EXHAUST-SOURCE = INFILTRATION, in which
case zonal exhaust does not affect air handler outside air requirements.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<pre style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:
.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'><o:p> </o:p></pre><pre
style='margin-left:.5in;text-align:center'>
<hr size=4 width="90%" align=center>
</pre><pre style='margin-left:.5in'><o:p> </o:p></pre><pre
style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'><o:p> </o:p></pre><pre
style='margin-left:.5in'>_______________________________________________<o:p></o:p></pre><pre
style='margin-left:.5in'>Equest-users mailing list<o:p></o:p></pre><pre
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style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'><o:p> </o:p></pre><pre
style='margin-left:.5in;text-align:center'>
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</pre><pre style='margin-left:.5in'><o:p> </o:p></pre><pre
style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'><o:p> </o:p></pre><pre
style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'>No virus found in this incoming message.<o:p></o:p></pre><pre
style='margin-left:.5in'>Checked by AVG - <a href="http://www.avg.com">www.avg.com</a> <o:p></o:p></pre><pre
style='margin-left:.5in'>Version: 9.0.733 / Virus Database: 271.1.1/2751 - Release Date: 03/16/10 15:33:00<o:p></o:p></pre><pre
style='margin-left:.5in'><o:p> </o:p></pre><pre style='margin-left:.5in'> <o:p></o:p></pre>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><o:p> </o:p></p>
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