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Patrick,<br>
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<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Another
question: the exterior walls have a specified R value,
does it matter if i model the exterior walls with multiple
layer with combined is that R value or can i just
implement 1 layer with the same specified R value?<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">As
the walls a modeled with the response theory it does not
really matter what u stick in between the frontside and
backside aslong as the R is the same correct?</span></p>
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it matters a lot. The R-value of a wall is only one measure of its
performance. The thermal mass of the wall is of great importance
too. You can get the same R-value with a small amount of insulation
or with a colossal amount of concrete; the two walls will behave
very differently. You're going to need to make some kind of educated
guess about the construction of the wall. If you want to completely
neglect the thermal capacitance of the wall, you can specify your
exterior walls as being made up of a single, massless layer with the
R-value that has been reported.<br>
<br>
Also be careful in that R-values are sometimes specified with an
assumed convection/radiation term on the inside and outside
surfaces. Therefore the R-value of the actual wall materials will be
different from the R-value of the entire wall.<br>
<br>
Best,<br>
david<br>
<br>
<br>
<br>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"
lang="EN-GB">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"
lang="EN-GB"> David BRADLEY [<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>]<br>
<b>Sent:</b> Thursday, October 18, 2012 4:05 PM<br>
<b>To:</b> Patrick Fabriek<br>
<b>Cc:</b> </span><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"><a
moz-do-not-send="true"
href="mailto:trnsys-users@cae.wisc.edu"><span
lang="EN-GB">trnsys-users@cae.wisc.edu</span></a></span><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"
lang="EN-GB"><br>
<b>Subject:</b> Re: [TRNSYS-users] TYPE 56, Active
layer minflow error</span><span style="color:black"
lang="EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="color:black">Patrick,<br>
This is a known bug and one that we are working on
solving. The problem appears to come from a dynamic
calculation of the transition between laminar and
turbulent flow which (to my understanding) includes a
correction for the actual water temperature when
performed during a simulation in Type56 but for an
assumed water temperature when performed in TRNBuild.
I have found that if you increase the mass flow rate
by a bit then you get away from the problem. It
sounds, however, as though this hasn't worked in your
case. If the project is not too complicated, please
send it and we can have a closer look internally.<br>
Kind regards,<br>
David<br>
<br>
<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span style="color:black">On
10/18/2012 05:57, Patrick Fabriek wrote:<o:p></o:p></span></p>
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<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Dear
Trnsys users,<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">I
have been using Trnsys for a months now and trying
to model a simple single floor Zero energy house
recently build in Rotterdam.<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Im
now at the point where i am defining the floor
heating with active layer in TRNBuild but i get
this error : Specific fluid mass flow of active
layer in surface 1 below minimum value of 12,98
kg/m2h. <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">The
minimum allowed inlet specific mass flowrate
is valued at 16.68 kg/ h m2 so this error is very
strange. I put the desired specific flow rate at
17.<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">I
have been increasing the massflow or lowering it
still give the error.<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Does trnsys
studio recalculate specific value somewhere else?
anyone has a another solution for implementing
floor heating.<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Regards,<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black">Patrick
F
<o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> <o:p></o:p></span></p>
<p><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black"> <o:p></o:p></span></p>
</div>
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<br>
<o:p></o:p></span></p>
<pre><span style="color:black">_______________________________________________<o:p></o:p></span></pre>
<pre><span style="color:black">TRNSYS-users mailing list<o:p></o:p></span></pre>
<pre><span style="color:black"><a moz-do-not-send="true" href="mailto:TRNSYS-users@cae.wisc.edu" target="_blank">TRNSYS-users@cae.wisc.edu</a><o:p></o:p></span></pre>
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<br>
<o:p></o:p></span></p>
<pre><span style="color:black">-- <o:p></o:p></span></pre>
<pre><span style="color:black">***************************<o:p></o:p></span></pre>
<pre><span style="color:black">David BRADLEY<o:p></o:p></span></pre>
<pre><span style="color:black">Principal<o:p></o:p></span></pre>
<pre><span style="color:black">Thermal Energy Systems Specialists, LLC<o:p></o:p></span></pre>
<pre><span style="color:black">22 North Carroll Street - suite 370<o:p></o:p></span></pre>
<pre><span style="color:black">Madison, WI 53703 USA<o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black">P:+1.608.274.2577<o:p></o:p></span></pre>
<pre><span style="color:black">F:+1.608.278.1475<o:p></o:p></span></pre>
<pre><span style="color:black"><a moz-do-not-send="true" href="mailto:d.bradley@tess-inc.com" target="_blank">d.bradley@tess-inc.com</a><o:p></o:p></span></pre>
<pre><span style="color:black"><o:p> </o:p></span></pre>
<pre><span style="color:black"><a moz-do-not-send="true" href="http://www.tess-inc.com" target="_blank">http://www.tess-inc.com</a><o:p></o:p></span></pre>
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<span
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<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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