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Johannes,<br>
Your formula looks right except that I don't think the first
Tst,previous term on the right hand side should be divided by the
Cp,st*m,st.<br>
<br>
You can get the temperature at the previous time step by using
either Type661 from the TESS Libraries or Type93. Both hold on to
output values for a user-specified number of timesteps before
releasing them.<br>
<br>
I am not entirely clear why you don't want to use an actual
storage media model such as Type10, which solves the coupled
differential equations that allow you to model stratified storage.<br>
<br>
Best,<br>
david<br>
<br>
<br>
On 5/18/2012 04:45, Johannes Schütz wrote:
<blockquote
cite="mid:CAFApcfOxmUUtAmVzQSk0LEguNuXRohpmaWcFbm2tSs5ZrjE2cg@mail.gmail.com"
type="cite">Hello Trnsys-users,<br>
<br>
first of all I have to admit, that I'm quite new to Trnsys Studio.
So the question might be really easy to answer. I would<br>
be really glad, if you can help me. <br>
<br>
My problem is the following: <br>
<br>
I have linked a solar air collector to an equation, which is
supposed to simulate the sensible storage in a very simplified
way. <br>
I assume, that the temperature of the hot air from the collector
is constant, also the volume flow and further I assume, that the <br>
heat transfer between the hot air and the heat storage is ideal.
That means, that the air is released from the storage at storage <br>
temperature. Last not least I assume that there are no heat
lossses to the ambience. <br>
<br>
Taking all the assumptions above, an estimation of the storage
temperature for each timestep shouldn't be difficult.<br>
I would propose the following formula:<br>
<br>
<img moz-do-not-send="true"
src="data:image/png;base64,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!
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K9fpL1OaS
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XHqNFYqjj
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="
alt=""><br>
<br>
The only problem I face, how to command Trnsys to use the Storage
tempearture Tst from the <br>
previous timestep. Hopefully you can help me solving my problem. <br>
<br>
Thanks for your help in advance.<br>
<br>
Take care <br>
<br>
Jojo<br>
<span style=""></span>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
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</blockquote>
<br>
<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
<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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