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</o:shapelayout></xml><![endif]--></head><body bgcolor=white lang=PL link=blue vlink=purple><div class=WordSection1><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 lang=EN-US style='color:#1F497D'>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 lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>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 lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>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 lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Kind regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Karol<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'><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 [mailto:d.bradley@tess-inc.com] <br><b>Sent:</b> Monday, June 4, 2018 7:06 PM<br><b>To:</b> TRNSYS users mailing list at OneBuilding.org <trnsys-users@lists.onebuilding.org>; trnsys-users@cae.wisc.edu<br><b>Cc:</b> Karol Bandurski <karol.bandurski@put.poznan.pl><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 lang=EN-US style='mso-fareast-language:PL'>--------------------------------------------------------------------</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:PL'>Karol BANDURSKI M. Sc.</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:PL'>Faculty of Civil and Environemntal Engeneering</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:PL'>Division of Heating, Air Conditioning and Air Protection</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US style='mso-fareast-language:PL'>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">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"><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">TRNSYS-users@lists.onebuilding.org</a><o:p></o:p></pre><pre><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">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">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">http://www.tess-inc.com</a><o:p></o:p></pre><pre><a href="http://www.trnsys.com">http://www.trnsys.com</a><o:p></o:p></pre></div></body></html>