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<p>José Javier,</p>
<p> Sorry for the delay in getting back to you. Is the problem
specific to one particular fourth air node? In other words, does
it all work so long as you have three zones (no matter which three
zones they are) and everything turns to zero when you add the
fourth zone? Or is there something strange about one particular
zone (which happens to be the fourth one that you are adding)?<br>
</p>
<p> In a way, two concepts are getting mixed up here. Your building
is operating in "energy rate control" in which it is calculating a
load, an energy removal rate that must be provided by the cooling
coil. The cooling coil's energy removal rate should not be passed
back to the building though because if it is then the load
changes. The cooling coil is intended to operate in "temperature
level control" in which you turn off the load calculation in the
building and allow its temperature to float. You then define a
thermostat and some combination of coils, plenums, pumps, and
fans, which act together to maintain the building's temperature as
close to the setpoint as possible.</p>
<p> I would recommend that you switch off the idealized COOLING
(and HEATING) types in TRNBuild and instead define a VENTILATION
for each of your zones. Then, instead of passing the air side heat
transfer from the cooling coil to the building, you'll pass the
outlet air conditions from the coil to those VENTILATIONs. A
thermostat model will be needed in order to command the fan and
pump that move air and liquid across the cooling coil.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 05/12/2021 02:52, RUBIO RUBIO, JOSÉ
JAVIER wrote:<br>
</div>
<blockquote type="cite"
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<p class="MsoNormal">David,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Thank you for your
answer. I see your point but what doesn’t make sense to me
is the fact that I have four airnodes with different cooling
setpoints. When I use the Air Side Heat Transfer output from
the cooling coils (Type508) as an input for the cooling
power available in three of the airnodes, it works and Qcool
is not zero in any of them but it becomes zero (all of them)
when I include the fourth airnode.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I have used a plot to
compare the Qcool from Type56 and the Air Side Heat Transfer
output from the cooling coils and the difference among the
airnodes is that in the three which work, as I mentioned in
the previous paragraph, the output from the cooling coil is
bigger than Qcool from Type56. However, in the fourth
airnode is just the opposite.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I hope I have explained
myself clearly and you can help me to figure it out.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Thanks again in advance
and sorry for the inconvenience,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">José Javier.</span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="mso-fareast-language:ES" lang="EN-GB">De:</span></b><span
style="mso-fareast-language:ES" lang="EN-GB"> David
BRADLEY <a class="moz-txt-link-rfc2396E" href="mailto:d.bradley@tess-inc.com"><d.bradley@tess-inc.com></a>
<br>
<b>Enviado el:</b> lunes, 10 de mayo de 2021 19:50<br>
<b>Para:</b> TRNSYS users mailing list at
OneBuilding.org
<a class="moz-txt-link-rfc2396E" href="mailto:trnsys-users@lists.onebuilding.org"><trnsys-users@lists.onebuilding.org></a><br>
<b>CC:</b> RUBIO RUBIO, JOSÉ JAVIER
<a class="moz-txt-link-rfc2396E" href="mailto:josejavier.rubio@edu.upct.es"><josejavier.rubio@edu.upct.es></a><br>
<b>Asunto:</b> Re: [TRNSYS-users] Cooling demand in
TRNSYS<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p>José Javier,<span style="mso-fareast-language:ES"><o:p></o:p></span></p>
<p> What Type56 is reporting in those outputs is the amount of
additional energy that must be removed from a zone in order to
maintain the setpoint that you have provided. If you give the
zone exactly the amount of cooling energy that it needs then
the demand for additional cooling energy is zero.<o:p></o:p></p>
<p> kind regards,<o:p></o:p></p>
<p> David<o:p></o:p></p>
<p><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 05/07/2021 07:52, RUBIO RUBIO, JOSÉ
JAVIER via TRNSYS-users wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span lang="EN-GB">To whom it may
concern,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">I am developing a
cooling system with TRNSYS18 and I have several problems
when I try to connect as an input the heat transfer of the
coils in the chambers by using the Cooling Type Manager.
You have an example below:</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><img style="width:4.55in;height:1.125in"
id="Imagen_x0020_1"
src="cid:part1.A8929B7D.EF3814EF@tess-inc.com" class=""
width="437" height="108"><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">Where Q_evap4C,
Q_evap8C, Q_carga4C and Q_descarga4C are the “Air Side
Heat Transfer” output of the cooling coils.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"><img
style="width:3.5166in;height:2.075in"
id="Imagen_x0020_2"
src="cid:part2.225413E1.D2456B88@tess-inc.com" class=""
width="338" height="199"></span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB">When I use it as an
input for the power available in each cooling zone, the
cooling demand of the zone is zero which is non-sense. Any
way to figure it out?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:ES"
lang="EN-GB">Thanks in advance and sorry for the
inconvenience,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:ES"
lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:ES"
lang="EN-GB">Best regards.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:ES"
lang="EN-GB"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:ES"
lang="EN-GB">Jose Javier.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:ES"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>TRNSYS-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:TRNSYS-users@lists.onebuilding.org" moz-do-not-send="true">TRNSYS-users@lists.onebuilding.org</a><o:p></o:p></pre>
<pre><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org" moz-do-not-send="true">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><o:p></o:p></pre>
</blockquote>
<pre>-- <o:p></o:p></pre>
<pre>***************************<o:p></o:p></pre>
<pre>David BRADLEY<o:p></o:p></pre>
<pre>Principal<o:p></o:p></pre>
<pre>Thermal Energy Systems Specialists, LLC<o:p></o:p></pre>
<pre>3 North Pinckney Street - suite 202<o:p></o:p></pre>
<pre>Madison, WI 53703 USA<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>P:+1.608.274.2577<o:p></o:p></pre>
<pre><a href="mailto:d.bradley@tess-inc.com" moz-do-not-send="true">d.bradley@tess-inc.com</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><a href="http://www.tess-inc.com" moz-do-not-send="true">http://www.tess-inc.com</a><o:p></o:p></pre>
<pre><a href="http://www.trnsys.com" moz-do-not-send="true">http://www.trnsys.com</a><o:p></o:p></pre>
</div>
</blockquote>
<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
<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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