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<p>Karol,</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.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 06/04/2018 01:58, Karol Bandurski
via TRNSYS-users wrote:<br>
</div>
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<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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">There are two errors:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">1)<span
style="font:7.0pt "Times New Roman""> </span></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.<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
lang="EN-US"><span style="mso-list:Ignore">2)<span
style="font:7.0pt "Times New Roman""> </span></span></span><!--[endif]--><span
lang="EN-US">Subroutine INVERT was called from subroutine
INVPAR with a singular matrix!<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I have increase number
of loops 10 times but nothing change…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It is possible to do
simulation with so low mass flow rate?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Kind regards,<br>
Karol<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">--------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Karol BANDURSKI M. Sc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Faculty of Civil and Environemntal Engeneering<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Division of Heating, Air Conditioning and Air
Protection<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:PL"
lang="EN-US">Poznan University of Technology<o:p></o:p></span></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><o:p></o:p></span></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><span
style="color:#1F497D;mso-fareast-language:PL" lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
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