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<p>Alice,</p>
<p> Three possibilities are worth checking. First, put an online
plotter on the tank, heat pump, and return water. Plot mass flow
and temperature into and out of the two ports in the tank so that
you're absolutely certain that there isn't a small flow going on
when there should not be. Second, make sure that the capacity of
the heating elements in the tank are all set to zero so that there
isn't any auxiliary energy going into the tank. Third (and I doubt
that this is contributing) make certain that the questions about
how many nodes there are in the tank are all answered correctly.
This question appears in different forms on more than one of the
Type4 proforma's tabs. In some places you are asked how many nodes
there are while in other places you are asked how many nodes there
are in addition to the top and bottom nodes.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 06/13/2018 11:05, Alice Mugnini via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAO+-mFfWJ2vKnuT1y3KUny3q=HJXjrSwyRW0gRTO_sDJLQNJ-A@mail.gmail.com">
<div dir="ltr">
<div>Dear TRNSYS users, </div>
<div><br>
</div>
<div>I’m trying to implement a cooling system in a building with
fan-coils supplied by cold water from a tank. The tank (Type
4) is previously charged by a heat pump. When it starts to
discharge towards the fan-coil (Type 996) and the heat pump is
off, the tank temperature rises but it goes also above the
ambient temperature, while a constant temperature difference
between the supply and return water temperature from/to the
fan-coils is maintained. I would have expected that these two
temperatures reached the same value and for sure below the
ambient temperature. The result has no physical meaning and it
seems related to Type 996.</div>
<div><br>
</div>
<div>Has anyone experienced anything similar?</div>
<div><br>
</div>
<div>Thank you for your availability,</div>
<div>Alice</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
<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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