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Martin,<br>
I would recommend that you make a very simple project where the
chiller is subject to a known constant load with known constant
outdoor conditions. Hook up a Type65 online plotter to the chiller
and take a look at its performance under these known conditions;
once the model looks up the performance data in the data file, its
computations are really quite simplistic. You can verify them by
hand using the documentation in the 04-Mathematical Reference. This
will give you some confidence in your model.<br>
<br>
One of the issues that often occurs in modeling absorption
chillers is that if you compute a building load and pass it directly
to the chiller then the chiller spends a lot of its time running at
a very very low part load. In reality, a chiller can't operate much
below 20% capacity so you have to make sure that this is reflected
in the data file. The data file should have near zero capacity and
near zero fraction of design energy input below about 20% PLR (part
load ratio). At one time, I think there was an error in the Type107
example data file that showed too large a capacity at very low PLR.
The more correct way to model the system would be to place the
chiller on its own primary loop and to place the load on a secondary
loop. The loops can be separated by a thermal storage tank whose
volume is equal to the volume of the primary and secondary loops.
The chiller operates to keep the primary loop cold and the secondary
loop draws off only as much as it needs to meet the load.<br>
Kind regards,<br>
David<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/19/2012 01:51, Martin Ssembatya
wrote:<br>
</div>
<blockquote
cite="mid:CAOVnU7sDw274AtKQSsHc1+KXaaiPtUfhJgrATEmbMh-T1dW6tg@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>Hello there,</div>
<div> </div>
<div>I have been modelling a solar ooling system that uses one
of the YAazaki chiller models. I used type 107 for the
modelling of the absorption chiller partly because i did not
have satisfactory chiller performance data from the
manufacturer to model the chiller unit, but alos because i did
not have enough time and compiling language to create my own
model for this chiller. <em>But on using type 107 for this
purpose, i am not getting satifactory results from my
simulation i.e. the chilling energy is always too low
compared to the rated capacity of the chiller regardless of
the season of the year, including summer periods with high
insolation values. Is there any one who could have created a
TRNSYS model for any Yazaki absorption chiller unit? If yes,
can you kindly help me with that model you created and to
use it in my simulation and see its effect on results. I
will be very grateful. </em></div>
<div><em></em> </div>
<div>Best regards</div>
<div>Martin</div>
</div>
<br>
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<br>
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<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>
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