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Stefan,<br>
Type93 simply holds onto a value for as many time steps as you ask
it to, then "releases" the value. The control ought to work the same
regardless of the system size. I am not sure what you mean by
"continuous" controllers. If you mean that there are some
controllers that continuously modify a flow rate in order to
maintain an outlet temperature then a simple time delay might cause
some problems. You might look at some of the controllers available
in the TESS Controllers Library (for Trnsys17) as there are a number
of devices in there with minimum run times and start-delays.<br>
Best,<br>
David<br>
<br>
<br>
On 4/8/2011 04:05, Stefan Wachter wrote:
<blockquote
cite="mid:77371F2938F4A84EAE592A132FF27D198668DCADC7@RZ-MERKUR.hs-ulm.de"
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<div dir="ltr">Hello everybody,</div>
<div dir="ltr"> </div>
<div dir="ltr"><font face="tahoma" size="2">I am new at
trnsys-users.</font></div>
<div dir="ltr"><font face="tahoma" size="2">Currently I`m
modeling an already existing solar heating system (for hot
water).</font></div>
<div dir="ltr"><font face="tahoma" size="2">In this system the
loading pump is activated by a time delay of 4 minutes
(after solar pump is launched).</font></div>
<div dir="ltr"><font face="tahoma" size="2">I tried to model
this as follows:</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font face="tahoma" size="2">- simulation time
step: 2 minutes</font></div>
<div dir="ltr"><font face="tahoma" size="2">- storage of the
control signal of the solar pump over the last two time
steps by means of type 93 (input value recall)</font></div>
<div dir="ltr"><font face="tahoma" size="2">- if the control
signal of the solar pump is "1" in the stored two time
steps, then the loading pump is launched.</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font face="tahoma" size="2">It works (tried by a
simple example deck) but does it also works</font> in
context with a quite big deck (120 m² apertur area, 2
continuous controllers)?</div>
<div dir="ltr"><font face="tahoma" size="2">I`m concerned about
that the small time step of 2 minutes could cause problems
(for example oscillations of the controllers).</font></div>
<div dir="ltr"><font face="tahoma" size="2">Could this work or
have someone of you another idea how i can solve this
problem?</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font face="tahoma" size="2">Thanks a lot.</font></div>
<div dir="ltr"><font face="tahoma" size="2">Best regards.</font></div>
<div dir="ltr"> </div>
<div dir="ltr"><font face="tahoma" size="2">Stefan Wachter</font> </div>
<div dir="ltr"> </div>
<div dir="ltr"> </div>
<div dir="ltr"> </div>
</div>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
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