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<p>Pu,</p>
<p> The building uses a method called the conduction transfer
function method to compute response factors for the walls.
Inherent in that method is a time base; s sort of "duration" for
how long each coefficient in the transfer function is in effect.
It may be that the jumps you are seeing conincide with the
timebase of your building model. Try going into TRNBuild and open
the "outputs" window. Change the wall timebase from (perhaps) 1hr
to 0.5hrs and see if the frequnency of those jumps changes as
well.</p>
<p>kind regards,</p>
<p> David</p>
<p> <br>
</p>
<div class="moz-cite-prefix">On 07/10/2022 20:44, Huijie Pu via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1b5066a9.9de.181eaedf8dc.Coremail.huijiepu@163.com">
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<div
style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">
<div style="line-height: 1.7;">
<div style="color: rgb(0, 0, 0); font-family: Arial;
font-size: 14px; margin: 0px;">Hello,</div>
<div style="margin: 0px;">
<div style="margin: 0px;">
<div style="color: rgb(0, 0, 0); font-family: Arial;
font-size: 14px; margin: 0px;"> I built a room model
with Cooling set to 26 degrees and gain set to
ASHRAE_115W-Person_AIII_24癈, for a total of 60 people.
The simulation time step is 0.01h. But the output value
QCOOL does not know why it is a sharp rise in one hour.
In the following model construction, Cooling is turned
off, and PID is used to adjust the temperature. The
obtained temperature change is also a change in one hour
as a stage, and the airflow output by PID is also like
this.</div>
<div style="color: rgb(0, 0, 0); font-family: Arial;
font-size: 14px; margin: 0px;"><br>
</div>
<div style="margin: 0px;"> I would like to know if this
is how the output changes originally, or what parameters
need to be adjusted to change? When using the output of
PID, I don't know whether it is a problem with the
setting of the PID parameters, or the time setting of
the system?</div>
<div style="margin: 0px;"><br>
</div>
<div style="margin: 0px;">
<div style="margin: 0px;">kind regards,</div>
<div style="margin: 0px;">Pu</div>
</div>
<div style="color: rgb(0, 0, 0); font-family: Arial;
font-size: 14px; margin: 0px;"><img
src="cid:part1.xVKZqUTk.0FPJQfRw@tess-inc.com"
orgwidth="1910" orgheight="982" data-image="1"
style="width: 814.5px; height: 419px; border: none;"
class=""></div>
<div style="color: rgb(0, 0, 0); font-family: Arial;
font-size: 14px; margin: 0px;"><img
src="cid:part2.OUaHHz7W.colUtMAy@tess-inc.com"
orgwidth="1910" orgheight="982" data-image="1"
style="width: 914px; height: 469px;" class=""></div>
<div style="color: rgb(0, 0, 0); font-family: Arial;
font-size: 14px; margin: 0px;"><img
src="cid:part3.REd4OOZ7.0ceDnoMg@tess-inc.com"
orgwidth="1910" orgheight="982" data-image="1"
style="width: 914px; height: 469px;" class=""></div>
<div style="color: rgb(0, 0, 0); font-family: Arial;
font-size: 14px; margin: 0px;"><br>
</div>
</div>
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<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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</blockquote>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy System 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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