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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Anand,<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'>The only thing I can think of to simulate a thermal lag is to
use Type661, Delayed Inputs, beyond just using a really long pipe that has more
than 1 time step worth of mass inside it. <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'>Use this with caution as Type661 is really meant to be for
control purposes and not for heat transfer. <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'>You can have heat transferred to the absorption chiller and then
use type661 to delay the output for any number of time steps. Unfortunately,
that leaves it to you to figure out how many time steps are appropriate. <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'>I hadn’t thought of this before, but the delay is probably
due to the fact that as additional heat is delivered to the absorption chiller
more refrigerant (water or ammonia depending on the type of chiller) is boiled
off and then goes through the condenser and evaporator before providing the
cooling benefit. It would make sense that there is a lag as the thermal inertia
of the system would matter. You might be able to estimate this by determining
the flow rate of the refrigerant and the pipe length between the desorber
(generator) and the evaporator. That would get you in the ball park, maybe. <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'>You might also want to consider the time it would take to boil
off the additional refrigerant. If you have a vessel with refrigerant at a
certain condition and you wish to evaporate a certain mass, and you have a heat
input rate you should be able to estimate it. This is complicated by the fact
that as you are boiling off refrigerant more refrigerant is entering the system
from the previous time step. <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'>Typically, absorption chiller calculations like this are done
with EES rather than TRNSYS. After creating the EES model, you can use TRNSYS
to call the EES model. <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'>Good luck,<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'>Fred<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>
<table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'>
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<td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#660000;
text-transform:uppercase'>Fred Betz</span></b><b><span style='font-size:9.0pt;
font-family:"Calibri","sans-serif";color:#333333'> </span></b><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'>PhD.,
LEED AP <br>
</span><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#333333;text-transform:uppercase'>Sustainable Systems Analyst</span><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'><o:p></o:p></span></p>
</td>
<td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#333333'> <o:p></o:p></span></p>
</td>
<td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#660000'>AEI</span></b><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> |
AFFILIATED ENGINEERS, INC. <br>
5802 Research Park Blvd. | Madison, WI 53719<br>
<br>
</span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#660000'>P: 608.236.1175 | F: 608.238.2614</span><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#333333'> <br>
</span><span style='font-size:9.0pt;font-family:"Calibri","sans-serif";
color:#660000'><a href="mailto:fbetz@aeieng.com"><span style='color:#660000;
text-decoration:none'>fbetz@aeieng.com</span></a> | </span><b><span
style='font-size:9.0pt;font-family:"Calibri","sans-serif";color:#660000'><a
href="http://www.aeieng.com/"><span style='color:#660000;text-decoration:
none'>www.aeieng.com</span></a></span></b><span style='font-size:9.0pt;
font-family:"Calibri","sans-serif";color:#333333'> <o:p></o:p></span></p>
</td>
</tr>
</table>
<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 style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><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"'> Anand Upadhyay
[mailto:Anand.Upadhyay@teri.res.in] <br>
<b>Sent:</b> Friday, April 16, 2010 5:44 AM<br>
<b>To:</b> trnsys-users@engr.wisc.edu<br>
<b>Subject:</b> [TRNSYS-users] Thermal lag in absorption chillers<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>Dear
all,<br>
<br>
I need to model a single stage absorption chiller based cold storage system.
When interacting with the manufacturer of the chiller, I came to know that
there is an appreciable thermal lag in the absorption chiller machines. The
manufacturer told me that with a varying heat source temperature, the
absorption chiller wont respond to the changes in source conditions fast
enough. Note that I plan to use solar thermal energy (how water) as my heat
source.<br>
<br>
Hence my queries are as follows:<br>
1. Does Type 107 in TRNSYS, take into consideration this thermal lag ? I
referred to the documentation but I am still confused.<br>
2. Alternatively is there any other Type which models the thermal lag, and
which I should buy ?<br>
3. Otherwise any suggestions on how I can model this thermal lag in the chiller
?<br>
<br>
Hope some of you have already encountered this problem (and reached a solution
!!!).<br>
Looking forward for your help<o:p></o:p></span></p>
</div>
<div>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif"'>-<br>
Regards,<br>
<br>
Anand Upadhyay<br>
The Energy & Resources Institute (TERI), New Delhi<o:p></o:p></span></p>
</div>
<pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>------------------------------------------------------------------------------------------------------------ <o:p></o:p></pre><pre>Disclaimer: <o:p></o:p></pre><pre>The information contained in this e-mail is intended for the person or entity<o:p></o:p></pre><pre>to which it is addressed, and it may contain confidential and/or privileged<o:p></o:p></pre><pre>material. Any review or other use of this mail or taking any action based on it<o:p></o:p></pre><pre>by persons or entities other than the intended recipient is strictly prohibited.<o:p></o:p></pre><pre>If you receive this e-mail by mistake, please contact the sender, and delete all<o:p></o:p></pre><pre>copies of this mail.This e-mail has been scanned and verified by McAfee SaaS<o:p></o:p></pre><pre>Email Security, formerly MX Logic.<o:p></o:p></pre></div>
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