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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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!
 uYqT9bYn
VMbwd3LD3ehqSAihJdQhyt4ZQTJWRuZolaabQa5F/G2LAei3aNz8/PZ7OZ0QbzxbK695KnzeixVPPwzOmhU/NGzXUO1l4Xy9o+jVUQRVFhCypOit+VUkGUrJOIRl/5MUqyTTzehrk1ZOuVsWO6bh4L+bFIKpCs6QyvIpsKp3ZnA1j53IbMyodW86bORis3kbVRIdxZmcLstc/MYVS2it5WhVPbzmIWfXFx8evXL4dkw6nLdqZNSitXeodjn9CFyd+Zlu3RzhgVLVIPn71g7/M0vgrGRUFmtpGD/i9TJVZrsHL0GhDDNNpBax/S+PRQ1w5OXULGp0+fvn//bjTBJBy7I7PUWDaFcVijT+3AETbsz9VBTRO45uFgp6To4VnMvR9pveL8s7bT9cSrFpwk2Izd7qu865qQ/e/uz0q75Ftl0S5feJcWc7RN+y+5JFGglLJryFbG+FzVZdEPzsKpKw+is7Oz379/OzZo96mpFIdT105cmCvaGzTjxO+b9UOCl1n8cmVtvtqp9ZMAyzDtsvTFOGN1mblh+MWMsjj3ZY7BYHBzc2P8OF9Ma0Qm90cBp/bhiRqrF1XdjtoSJATsNfUDgRYyCWl4kW4AF77mN6NXYIQK2y9kZO96xcsl31xGD83RlFmb+c5sKFBR5LqyQFc3zjQc+th9spVTn5+f8zfnsU5NyzuAU1v3OmWLtNunXq/nT3dKN/j9OLVDDllFO3X0OnXZQoxTr8s9ZWgbDAZ2smu+eK6ITK1nbp341nTqtl//dWzT420YhHePzgWeJ2FwdftsfXZvbTTNvz7dXQXh5MlRytPdVTC+ZzYy/UzW+jzNf78fBcVnuuVsVrFxUoHnSRiUleEVsVNZAcdcUpN68rVJE65tTdNYsWueJ2E4eVrej8b3joLo6uZnplmW8+k4KCpGKnk/yprRJ7yYLi+v/j25ZWbZlZyOg2KD03FRvU1x3qpuJrqwuaK9QUfI0RWbTq6dns/!
 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>
      <pre wrap="">_______________________________________________
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</pre>
    </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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