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<p>Daniel,<br>
</p>
<p>Type123 does a computation to find the maximum possible heat
transfer at the given rated conditions (air and water inlet
temperature, air inlet humidity, air and water flow rates). It
then compares the stated capacity to the calculated maximum. In
the case of the parameters that you have specified below, the
maximum possible heat transfer is being calculated as 234. kJ/h.
However! if you reduce the total and sensible heat transfer rates
to that value you will run into another error. <br>
</p>
<p>Fundamentally, the problem is that while Type123 assumes that the
coil is either totally dry or totally wet during operation its
basic UA calculation method is invalid if the coil's rated
conditions are for sensible-only heat transfer. We will certainly
work on making some better error handling for Type123. I think the
workaround for your case would be one of two things. You can
either give the model some rated conditions in which the total
capacity is greater than the sensible capacity or you could simply
use a sensible-only heat exchanger model for your cooling coil.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 07/16/2019 06:19, Hofmann, Daniel
via TRNSYS-users wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span style="color:black">Hello everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">I
currently try to use Type 123 Cooling Coil with TRNSYS18.
Type 123 is directly connected to the TRY2017 weather data
reader. All other inputs to Type 123 are considered to be
constant.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">The
rated parameter values are measured values and do not
include any dehumidification.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><img style="width:6.3333in;height:2.7395in"
id="Grafik_x0020_1"
src="cid:part1.8E2D7B33.B5134059@tess-inc.com" class=""
width="608" height="263"><span style="color:black"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">No
matter whether I use humidity mode 1 or 2 and no matter
whether I reduce the total cooling capacity to e.g. 400
kJ/hr I always get the following error: “The referenced Unit
has a bad parameter value. Reported information: Parameter
#7, Reported Problem: The total cooling capacity of the coil
is impossible at the given conditions.”
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">And
an additional warning message is shown: “The referenced Unit
has called the PSYCHOMETRICS routine one or more times
during the simulation with a humidity ratio above the
saturation humidity ratio for the given dry bulb
temperature. The air was assumed saturated at the given dry
bulb temperature and the humidity ratio set for this
condition.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">I
already checked the connection between the weather data
reader and Type 123. I also tried a simulation with constant
input values…..there is still not difference.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">Thus
I think it is a bug in Type 123 or the psych subroutine.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US">Does
anyone have a solution or an idea what could cause the
errors? Thanks a lot for any help!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:black;mso-fareast-language:DE">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:black;mso-fareast-language:DE"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:black;mso-fareast-language:DE">Daniel Hofmann<br>
<br>
</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
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>
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