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<p>Adnan,</p>
<p> If the flow rate is proportional to the ambient temperature then
there are some models in the TESS Controls library that you can
use (Type1250 for example). If you are doing feedback control (in
other words comparing a temperature to a desired temperature and
implementing a controller whose signal is proportional to the
difference between the two as well as to the integral of the
error) then there are some model in the standard controls library.
You might look at Types 22 and 23. PI and PID control can be a
little tricky in TRNSYS because we discretize time into time steps
that are quite long in comparison to the rate at which true PID
control samples and adjusts a control signal. I would recommend
looking at the PID example and documentation for some hints on how
to set it up.<br>
</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 06/17/2021 21:17, adnan rasheed via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAG9tXZi4fbMpzC52vh3e87ixtTGcP8G+Tgd2B=Nej9RNtMKCZw@mail.gmail.com">
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<div>Hi everyone,</div>
<div><br>
</div>
<div>I am using a hot water storage tank in which hot water is
coming from the heat pump. From the hot water storage tank to
building flow rate was controlled by PI controller in
experiment giving some p and i values. The system works in
this way: when more heating is needed and
outside temperature goes down, more flow and less heating
needs less flow coming from the storage tank . I am confused
which controller I should use in this situation? or do I need
to write an equation??</div>
<div><br>
</div>
<div>Thanks </div>
<div> </div>
-- <br>
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<div dir="ltr"><font face="georgia, serif" color="#666666">Adnan </font></div>
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<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
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<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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