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<p>Gabriela,</p>
<p> There are a lot of possibilities that might cause something like
this. Things that I would look at are whether there is the correct
VENTILATION set up in each zone of the building. I have made the
mistake a number of times in v18 of defining a VENTILATION in
TRNBuild but then forgetting to select it at the zone level. I
would also check the flow rate of liquid that is going into and
out of the fan coils in the zones that are not behaving. It may be
that if the zones are all being fed by a single pump that there
isn't enough flow available to feed all the fan coils the amount
of liquid that they want. <br>
</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 11/12/2020 07:57, gabriela vlad via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1832256265.4648184.1605189434504@mail.yahoo.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div class="yahoo-style-wrap" style="font-family:times new roman,
new york, times, serif;font-size:16px;">
<div dir="ltr" data-setdir="false">Dear Users,</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">I'm using type 928 (fan
coils) to heat 13 zones of a building. </div>
<div dir="ltr" data-setdir="false">For 10 of the zones, the heat
transfer takes place from the hot water stream to the air (as
it should be), the temperature of the water is reduce with
3oC and a significant thermal energy is delivered to the air. </div>
<div dir="ltr" data-setdir="false">There are some problems with
the 3 others zones: </div>
<div dir="ltr" data-setdir="false">- for one of them the heat
transfer rate is 0 and for two of them the heat transfer takes
place in the opposite way (the water is heated instead of
being cooled)</div>
<div dir="ltr" data-setdir="false">- the air temperature of the
zones is used as input (return air temperature) for the type
928; even though the temperature in the rooms is less than
30oC and the inlet water temperature is 63oC, it seems that
for this 3 zones the outlet air temperature is grater than
65oC</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">Please give some advice
regarding this problem!</div>
<div dir="ltr" data-setdir="false">Thank you!</div>
<div dir="ltr" data-setdir="false"><br>
</div>
<div dir="ltr" data-setdir="false">Gabriela</div>
</div>
<br>
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</blockquote>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
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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