<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#ffffff">
Qinpeng,<br>
<br>
You might get responses to your question on the EnergyPlus_Support
bulletin board than on BLDG-SIM. <br>
<br>
Joe<br>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 108D
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-abbreviated" href="http://www.whiteboxtechnologies.com">www.whiteboxtechnologies.com</a>
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<br>
On 6/6/2013 1:26 PM, Qinpeng Wang wrote:
<blockquote
cite="mid:CAETHmJ6NjaD+tJTD00MO55wDDxL0DMS1tA3269fVEkoBPnOWHQ@mail.gmail.com"
type="cite">Hi, all,
<div><br>
</div>
<div>I'm trying to model a PTAC system with economizer within E+
environment. </div>
<div><br>
</div>
<div>The specification of the system is:</div>
<div>
<p>The OA economizer here is to provide "free" cooling during
times of cool ambient conditions. The amount of outside air
taken into the building will vary between the design
percentage and the maximum percentage. And the design
percentage of OA of the system is not defined as related to
occupancy or floor area but 25% of total supply air.</p>
<p>I read the I/O reference about Controller:OutdoorAir, but it
seems:</p>
<p>"If all the limits are satisfied, the outdoor air controller
does the following for cycling fan systems: the outdoor air
flow rate is set to the maximum when the fan cycles on. If the
limits are not satisfied, the outdoor air flow rate is at the
minimum when the fan cycles on."</p>
<p>The problem is it's either minimum or maximum instead of
modulating according to outdoor and return air condition?</p>
<p>Does anyone have suggestions on this? Help greatly
appreciated.</p>
<p>Do I have to go to EMS for this control scheme?</p>
<p>Best,</p>
<p>Qinpeng<br clear="all">
</p>
<div><br>
</div>
-- <br>
<p><span style="color: rgb(31, 73, 125);">Qinpeng Wang, PhD
Student<br>
</span></p>
<p><span style="color: rgb(31, 73, 125);">College of
Architecture</span></p>
<p><span style="color: rgb(31, 73, 125);">Georgia Institute of
Technology</span></p>
<p><span style="color: rgb(31, 73, 125);">Atlanta, GA 30332-0155</span></p>
<br>
<span style="color: rgb(31, 73, 125);"></span>
</div>
<pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
Bldg-sim mailing list
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a>
To unsubscribe from this mailing list send a blank message to <a class="moz-txt-link-abbreviated" href="mailto:BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG">BLDG-SIM-UNSUBSCRIBE@ONEBUILDING.ORG</a>
</pre>
</blockquote>
</body>
</html>