<div dir="ltr">Thank you, thank you very much.<br>I'm preparing my memoiry of master i'm special in mechanic engeneering of thermal power, my memoiry is about ISCC integrated solai combine cycle systeme, if you have in exemple projet in transys about this send it please to study it.<br>
<br><div class="gmail_quote">2011/4/11 <span dir="ltr"><<a href="mailto:trnsys-users-request@cae.wisc.edu">trnsys-users-request@cae.wisc.edu</a>></span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<br>Today's Topics:<br>
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1. Re: time delay by means of type 93 (input value recall)<br>
(Matt Duffy)<br>
<br><br>---------- Message transféré ----------<br>From: "Matt Duffy" <<a href="mailto:duffy@tess-inc.com">duffy@tess-inc.com</a>><br>To: "Stefan Wachter" <<a href="mailto:wachter@mail.hs-ulm.de">wachter@mail.hs-ulm.de</a>>, <a href="mailto:trnsys-users@cae.wisc.edu">trnsys-users@cae.wisc.edu</a><br>
Date: Mon, 11 Apr 2011 15:35:35 -0500 (CDT)<br>Subject: Re: [TRNSYS-users] time delay by means of type 93 (input value recall)<br><br>
Hello Stefan,<br>
<br>
As long as you implement the timestep as a fraction in an EQUATIONS in the control cards, you should be ok. For example,<br>
<br>
EQUATIONS 1<br>
TIMESTEP=2/60 !Timestep of 2 mins<br>
<br>
Please see the attached for reference.<br>
<br>
<br>
Best regards, <br>
<br>
Matt Duffy <br>
<br>
<br>
<div style="background-repeat: repeat-x;"><b>----- Original Message -----</b><br>
<b>From:</b> "Stefan Wachter" <<a href="mailto:wachter@mail.hs-ulm.de" target="_blank">wachter@mail.hs-ulm.de</a>> <br>
<b>Sent:</b> Fri, April 8, 2011 4:05<br>
<b>Subject:</b> [TRNSYS-users] time delay by means of type 93 (input value recall)<br>
<br>
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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>
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