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<p>Miriam,</p>
<p> In addition to the things that Toni mentioned, also check to
make sure that you did not leave the ground boundary temperature
set to its default constant value of 0C. Leaving it set to the
default provides rather a lot of free cooling to a building.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 05/26/2021 06:03, miriam di matteo
via TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMb=MqsM+ic8eCMDovgZ08q2bTdeLqkLHc-6bLRkhcBLXG5a5Q@mail.gmail.com">
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<p>Dear all,</p>
<p>I have some questions about the cooling energy demand and the
output "QCOOL" NType 31 and 33. I'm studying a residential
building, and i need to know its Cooling demand.
My problem is that the QCOOL value is very low. It is about
30kW, but the manually estimated value is more than double
(>60kW).
I don't understand if I did something wrong in the modelling
or "QCOOL" isn't the Output that i need.</p>
<p>I followed this steps to realized TRNSYS model :</p>
<ul>
<li>I did a geometrical model with TRNSYS 3D (Google SketchUp
plugin), with its 13 apartments and whit the internal walls,
windows and external shading devices (as walls, balconies
etc...).</li>
<li>In TRNBuild i characterized Wall and Windows levers, and
insert the Infiltrations and internal gain from people and
light.</li>
<li>I know the characteristic of the boiler and radiators
installed; The GAS bill about 2018 and 2019; Moreover I
measured the trend of temperatures inside an apartment for 4
days. I calibrated my TRNSYS model with this data.</li>
<li>So I inserted in my Thermal zones a ideal Cooling:
Temperature set point 26°C, unlimited, humidity off.</li>
</ul>
<p>I followed a similar way for Heating demand, I used an Ideal
Heating with a set point temperature of 20°C, unlimited,
radiation part 20% and without humidification. I didn't
observed any problem with Heating simulations.</p>
<p>Can you confirm me that "QCOOL" (NType 31 and 33) represent
my cooling energy demand? In this case, if my TRNSYS model is
correct the Value of QCOOL it is necessary correct, right?
It means that I have to look for the error in the Trnsys
model, is it true?
Honesty i have no idea where the error might be, It seems to
me that everything is correct. But it is the first time that i
use Trnsys, so is easy that i insert a wrong parameters or
forget something, i think.
Anyone have any advice about it?</p>
<p>I hope someone can help me, it is very important. Thank all
in advance</p>
<p>Miriam</p>
</div>
<br>
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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
<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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