<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
</head>
<body dir="ltr">
<div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;">
<p></p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">Hi there,</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">Sorry for the mistake I mentioned in the previous email.</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">In fact, I can control the flow rate to the evaporator by installing a storage (buffer) tank and this is what I already did.</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">The real problem behind the negative values is the low flow rate to the generator and not the evaporator. That's what I can't control since the generator is driven by exhaust gases
from certain prime mover which in turn depends on the electrical load of the building (that I can't change).</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 16px;">Sorry and Thanks...again!</p>
<br>
<p></p>
<br>
<br>
<div style="color: rgb(0, 0, 0);">
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> David BRADLEY <d.bradley@tess-inc.com><br>
<b>Sent:</b> Thursday, February 11, 2016 12:07 AM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org; hsein_moussawi@hotmail.com<br>
<b>Subject:</b> Re: [TRNSYS-users] Absorption chiller</font>
<div> </div>
</div>
<div>Hsein,<br>
This would be a problem in a real system as well, not just in simulation. You need to isolate the load flow from the source flow by using either a primary/secondary pumping scheme or by putting a buffer tank between the load loop and the source loop.<br>
kind regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 02/10/2016 15:38, Hsein Moussawi wrote:<br>
</div>
<blockquote type="cite">
<div id="divtagdefaultwrapper" style="font-size:12pt; color:#000000; background-color:#FFFFFF; font-family:Calibri,Arial,Helvetica,sans-serif">
<p>Hi angel,</p>
<p>Yes I know how it works and the negative values mainly appear when the flow rate to the evaporator is low. However in the system I am simulating, I can't control this flow rate, it is imposed by other components (cooling load from building). So do you have
other suggestions?</p>
<p>Thanks for the fast reply.</p>
<p>Regards.</p>
<br>
<br>
<div style="color:rgb(0,0,0)">
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size:11pt"><b>From:</b> Angel Carrera
<a class="moz-txt-link-rfc2396E" href="mailto:angel.carrera@aiguasol.coop"><angel.carrera@aiguasol.coop></a><br>
<b>Sent:</b> Wednesday, February 10, 2016 9:28 PM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding. org<br>
<b>Subject:</b> Re: [TRNSYS-users] Absorption chiller</font>
<div> </div>
</div>
<div>
<p dir="ltr"><br>
Hi,</p>
<p dir="ltr">I giess that the flowrate you are giving as an input is too low related to the power requirement at the evaporator.<br>
I suggest you to read the descripción of the type to understand how it is working, regards</p>
<p dir="ltr">Angel</p>
<div class="gmail_quote">El 10/2/2016 20:14, "Hsein Moussawi" <<a href="mailto:hsein_moussawi@hotmail.com">hsein_moussawi@hotmail.com</a>> escribió:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
<div dir="ltr">
<div style="font-size:12pt; color:#000000; background-color:#ffffff; font-family:Calibri,Arial,Helvetica,sans-serif">
<p>Hello there,</p>
<p>I am using an exhaust fired absorption chiller in a certain system. After simulation the temperature of the hot fluid exiting the chiller is observed to be negative in many instances. This is impossible in reality. I am wondering if anyone faced a similar
problem!?</p>
<p>My question is: </p>
<p>Is there a way by which I can limit the output of a component to a certain point?? (e.g. outlet temperature of chiller to ambient temperature)</p>
<p>Thanks in advance TRNSYS community,</p>
<p>Best regards.</p>
</div>
</div>
<br>
_______________________________________________<br>
TRNSYS-users mailing list<br>
<a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a><br>
<a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org" rel="noreferrer" target="_blank">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><br>
<br>
</blockquote>
</div>
</div>
</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset> <br>
<pre>_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a>
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</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:d.bradley@tess-inc.com">d.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>
</div>
</div>
</div>
</body>
</html>