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<p class=MsoNormal>eQuest can model demand-control ventilation in a few ways,
without you having to define a custom schedule. There are two options for MIN-OA-CONTROL…
everything is do-able through the detailed interface (maybe the wizards too,
can’t recall), without jumping into the .inp file.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Following is a copy/paste from the DOE2 help file giving the
full behavioral explanation:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b>DCV-RETURN-SENSOR</b> This codeword instructs the program
to model a DCV device that uses a CO2 differential between the SYSTEM return
air stream and OA intake air stream to determine the hourly minimum OA
fraction. The program calculates the OA minimum requirement and sets the
minimum damper position hourly based upon the sum of the ZONE requirements.
Each zone OA requirement is calculated based upon the hourly maximum of either
OA-CFM/PER (times the NUMBER-OF-PEOPLE adjusted by the hourly PEOPLE-SCHEDULE)
or a minimum OA ventilation rate. The zone minimum OA ventilation rate is
either MIN-OUTSIDE-AIR if specified or the maximum of OA-CHANGES (times the
zone VOLUME/60), OA-FLOW/AREA (times the zone AREA.)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><b>DCV-ZONE-SENSORS</b> This codeword instructs the
program to model a DCV device that uses the highest CO2 differential between
the each ZONE air and OA intake air stream to determine the hourly minimum OA
fraction. The program calculates the OA minimum requirement and sets the
minimum damper position hourly using the “critical” zone
requirement; the critical zone requirement is defined as the zone having the
highest fraction of OA relative to its hourly supply air flow rate. Each zone
OA requirement is calculated based upon the hourly maximum of either OA-CFM/PER
(times the NUMBER-OF-PEOPLE adjusted by the hourly PEOPLE-SCHEDULE) or a
minimum OA ventilation rate. The zone minimum OA ventilation rate is either
MIN-OUTSIDE-AIR if specified or the maximum of OA-CHANGES (times the zone
VOLUME/60), OA-FLOW/AREA (times the zone AREA.). The value of the zone minimum OA
ventilation flow rate is divided by the specified/calculated zone supply flow
to calculate hourly zone OA fraction; the zone with the highest hourly flow
fraction value is the “critical” zone. Setting the sum of the ZONE
OA flow requirements divided by the system total supply fan flow to X, and
letting the critical zone OA fraction be denoted as Z, the system hourly
minimum OA flow fraction is then X/(1+X-Z)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><img width=119 height=37 id="Picture_x0020_1"
src="cid:image001.jpg@01CA5D66.9185E8C0" alt="cid:489575314@22072009-0ABB"><b><span
style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><span
style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west
valley parkway<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe ks 66061<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913
344.0036<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913
345.0617<o:p></o:p></span></p>
<p class=MsoNormal><i><span style='font-size:10.0pt;color:#2D4D5E'>Check out
our new web-site @ </span></i><span style='color:#1F497D'><a
href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span
style='font-size:10.0pt;color:blue'>www.smithboucher.com</span></a></span><u><span
style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoPlainText>-----Original Message-----<br>
From: bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] On Behalf Of Chris Jones<br>
Sent: Wednesday, November 04, 2009 1:43 PM<br>
To: bldg-sim@lists.onebuilding.org<br>
Subject: [Bldg-sim] LEED and CO2 DVC<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Is there a generally acceptable way to model CO2 demand
ventilation <o:p></o:p></p>
<p class=MsoPlainText>control for a LEED C&S project?<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>On other LEED projects (not Core & Shell), I have
used the occupancy <o:p></o:p></p>
<p class=MsoPlainText>schedule to set the outdoor air flow.<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>Chris Jones<o:p></o:p></p>
<p class=MsoPlainText>14 Oneida Avenue<o:p></o:p></p>
<p class=MsoPlainText>Toronto, ON M5J 2E3.<o:p></o:p></p>
<p class=MsoPlainText>Tel. 416-203-7465<o:p></o:p></p>
<p class=MsoPlainText>Fax. 416-946-1005<o:p></o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText>_______________________________________________<o:p></o:p></p>
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