<!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 bgcolor="#ffffff" text="#000000">
Salim,<br>
First, make sure that you have a reasonable thermal capacitance set
for your zone. The default thermal capacitance shown in TRNBuild only
accounts for the thermal capacitance of the air in the zone. Typically
a value about 5 times the default should be used.<br>
<br>
If that does not solve the problem then identify which zone is
causing the problem and begin turning off things that impact the zone
(gains from lights, gains from people, coupling air flows, etc.) until
it becomes stable. It is usually not too hard to identify the problem
that way.<br>
Best,<br>
david<br>
<br>
<br>
On 7/6/2010 04:57, salim mokraoui wrote:
<blockquote
cite="mid:002a01cb1cf1$a5a8a4a0$f0f9ede0$@mokraoui@lermab.uhp-nancy.fr"
type="cite">
<meta http-equiv="Content-Type"
content="text/html; charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 70.85pt 70.85pt;}
div.WordSection1
{page:WordSection1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal">Dear all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’m simulating a 5 zone
building
using a PID controller for each zone (temperature control). The
parameters of
PID (type 23) are predetermined and work well with another example (1
zone
building). With the 5 zone building the simulation stops after 1 hour
and the
error message says: zone 5 surface 47 pane temperature out of bounds at
time 1.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">How to overcome this problem ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">Salim MOKRAOUI<o:p></o:p></p>
<p class="MsoNormal">Faculté des sciences de Nancy - LERMAB<o:p></o:p></p>
<p class="MsoNormal">BP 239<o:p></o:p></p>
<p class="MsoNormal">54506 Vandoeuvre.<o:p></o:p></p>
<p class="MsoNormal">Tél 03 83 68 48 47 - mél
<a class="moz-txt-link-abbreviated" href="mailto:salim.mokraoui@lermab.uhp-nancy.fr">salim.mokraoui@lermab.uhp-nancy.fr</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<pre wrap="">
<fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@cae.wisc.edu">TRNSYS-users@cae.wisc.edu</a>
<a class="moz-txt-link-freetext" href="https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users">https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users</a>
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:bradley@tess-inc.com">bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
</body>
</html>