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<p>Karol,</p>
<p> In the screencap that you sent it is the value currently set to
10 that you need to adjust. The model is saying that as long as
the flow rate to the floor is greater than 9.09 kg/h.m2 (1229.52
kg/h) then you don't need auto segmentation. If you want a lower
flow rate than that (for example 8 kg/h.m2) then change the value
currently set to 10 to 8 and you should then have the ability to
segment the floor. The number of loops has a minor impact on the
allowable flow rate.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 06/04/2018 13:58, Karol BANDURSKI
wrote:<br>
</div>
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<p class="MsoNormal"><span style="color:#1F497D">David,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Both
this errors have appeared when I decrease mass flow rate two
times and increase number of loops 10 times…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">I
don’t know way, but I don’t have option “autosegmentation”
(print screen enclosed)…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">It
seems to me that increase of loops number has not change
minimum allowed mass flow rate.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Kind
regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US">Karol<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="color:windowtext;mso-fareast-language:PL">From:</span></b><span
style="color:windowtext;mso-fareast-language:PL"> David
BRADLEY [<a class="moz-txt-link-freetext" href="mailto:d.bradley@tess-inc.com">mailto:d.bradley@tess-inc.com</a>] <br>
<b>Sent:</b> Monday, June 4, 2018 7:06 PM<br>
<b>To:</b> TRNSYS users mailing list at OneBuilding.org
<a class="moz-txt-link-rfc2396E" href="mailto:trnsys-users@lists.onebuilding.org"><trnsys-users@lists.onebuilding.org></a>;
<a class="moz-txt-link-abbreviated" href="mailto:trnsys-users@cae.wisc.edu">trnsys-users@cae.wisc.edu</a><br>
<b>Cc:</b> Karol Bandurski
<a class="moz-txt-link-rfc2396E" href="mailto:karol.bandurski@put.poznan.pl"><karol.bandurski@put.poznan.pl></a><br>
<b>Subject:</b> Re: [TRNSYS-users] small mass flow in
TABS<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Karol,<span style="font-size:12.0pt;mso-fareast-language:PL"><o:p></o:p></span></p>
<p> I do not think that the problem with the matrix inversion
and the low flow rate in the active layer are necessarily
related. I'm not sure what to suggest about the matrix
inversion. The active layer model has a minimum allowable flow
rate that is based on pipe spacing, the thickness of the
layer(s) in which the pipes are embedded and the area of the
floor. If you want to give a lower flow rate then you need to
segment the floor, which means treating the floor like it was
a few floors in series. Enter the desired minimum mass flow
rate in the active layer definition screen. If it is below the
minimum "allowed" mass flow rate then you'll have the option
to segment the floor.<o:p></o:p></p>
<p>kind regards,<o:p></o:p></p>
<p> David<o:p></o:p></p>
<p><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 06/04/2018 01:58, Karol Bandurski via
TRNSYS-users wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Dear Experts<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have problem with
simulation TABS with specific mass flow rate about 5.4
kg/hm2.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">There are two errors:</span><o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="mso-list:Ignore">1)<span style="font:7.0pt
"Times New Roman""> </span></span><!--[endif]--><span
lang="EN-US">Specific fluid mass flow of active layer in
surface 894 below minimum value of 8.90 kg/m2h Please,
increase the minimum mass flow rate or use the
autosegmentation feature of TRNBuild for subdividing the
surface.</span><o:p></o:p></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><!--[if !supportLists]--><span
style="mso-list:Ignore">2)<span style="font:7.0pt
"Times New Roman""> </span></span><!--[endif]--><span
lang="EN-US">Subroutine INVERT was called from subroutine
INVPAR with a singular matrix!</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I have increase number
of loops 10 times but nothing change…</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">It is possible to do
simulation with so low mass flow rate?</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Kind regards,<br>
Karol</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">--------------------------------------------------------------------</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Karol BANDURSKI M. Sc.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Faculty of Civil and Environemntal
Engeneering</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Division of Heating, Air Conditioning and Air
Protection</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Poznan University of Technology</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"><a
href="https://www.researchgate.net/profile/Karol_Bandurski"
moz-do-not-send="true">https://www.researchgate.net/profile/Karol_Bandurski</a></span><o:p></o:p></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:PL"><a
href="http://www.put.poznan.pl/%7Ekarol.bandurski"
moz-do-not-send="true"><span lang="EN-US">www.put.poznan.pl/~karol.bandurski</span></a></span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:PL"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>TRNSYS-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:TRNSYS-users@lists.onebuilding.org" moz-do-not-send="true">TRNSYS-users@lists.onebuilding.org</a><o:p></o:p></pre>
<pre><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org" moz-do-not-send="true">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:PL"><br>
<br>
<o:p></o:p></span></p>
<pre>-- <o:p></o:p></pre>
<pre>***************************<o:p></o:p></pre>
<pre>David BRADLEY<o:p></o:p></pre>
<pre>Principal<o:p></o:p></pre>
<pre>Thermal Energy Systems Specialists, LLC<o:p></o:p></pre>
<pre>22 North Carroll Street - suite 370<o:p></o:p></pre>
<pre>Madison, WI 53703 USA<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>P:+1.608.274.2577<o:p></o:p></pre>
<pre>F:+1.608.278.1475<o:p></o:p></pre>
<pre><a href="mailto:d.bradley@tess-inc.com" moz-do-not-send="true">d.bradley@tess-inc.com</a><o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><a href="http://www.tess-inc.com" moz-do-not-send="true">http://www.tess-inc.com</a><o:p></o:p></pre>
<pre><a href="http://www.trnsys.com" moz-do-not-send="true">http://www.trnsys.com</a><o:p></o:p></pre>
</div>
</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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