<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
</head>
<body>
<p>Toni,</p>
<p> I have run into this problem from time to time as well and was
never able to discover the cause. I found that if I increased the
flow rate to about 1.1 times the stated required flow the the
error usually went away. The other thing you can do, of course, is
to segment the floor so that it will allow you to enter the flow
that you wanted.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 02/08/2021 03:08, Toni Calabrese via
TRNSYS-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:VE1PR09MB32141041313CB9E36E6CB36DE98F9@VE1PR09MB3214.eurprd09.prod.outlook.com">
<meta http-equiv="Content-Type" content="text/html;
charset=windows-1252">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]-->
<style>@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Arial",sans-serif;
mso-fareast-language:EN-US;}a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0065A3;
text-decoration:underline;}a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#6E1C50;
text-decoration:underline;}p.MsoListParagraph, li.MsoListParagraph, div.MsoListParagraph
{mso-style-priority:34;
margin-top:0cm;
margin-right:0cm;
margin-bottom:0cm;
margin-left:36.0pt;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Arial",sans-serif;
mso-fareast-language:EN-US;}span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Arial",sans-serif;
color:windowtext;}.MsoChpDefault
{mso-style-type:export-only;
font-family:"Arial",sans-serif;
mso-fareast-language:EN-US;}div.WordSection1
{page:WordSection1;}ol
{margin-bottom:0cm;}ul
{margin-bottom:0cm;}</style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US">Hi
everyone,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US">For a
pilot project we are analyzing a heating system in which an
"external wall heating system" is installed on the façade.
Basically we have a wall with an active layer that is
insulated on the back in order to decrease the losses of
this active layer to the outside.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US">With a
pipe spacing of 13.5 cm the system was working good. For a
parametric study, I would like to run a study varying the
pipe spacing. Setting the pipe spacing to 10 cm (instead of
13.5 cm) the system does not simulate anymore. It gives me
the following error:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="EN-US">Message
: Specific fluid mass flow of active layer in surface 24
below minimum value of 8.01 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="MsoNormal"><span style="font-size:10.0pt" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US">I
checked the massflow rate and I am sure that the mass flow
rate is higher than the minimum. I tried to increase the
massflow rate through the pump of the system but it does not
work. Which is the problem?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US">Here the
data of my simulation:<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US"><span
style="mso-list:Ignore">-<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt" lang="EN-US">TRNSYS 17<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US"><span
style="mso-list:Ignore">-<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt" lang="EN-US">Wall area: 10.16 m2<o:p></o:p></span></p>
<p class="MsoListParagraph"
style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><!--[if !supportLists]--><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US"><span
style="mso-list:Ignore">-<span style="font:7.0pt
"Times New Roman"">
</span></span></span><!--[endif]--><span
style="font-size:10.0pt" lang="EN-US">Massflow rate system:
86 kg/h<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt" lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D" lang="EN-US"><o:p> </o:p></span></p>
<div class="MsoNormal" style="text-align:center" align="center"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH">
<hr width="100%" size="2" align="center">
</span></div>
<p class="MsoNormal" style="margin-top:4.0pt"><b><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH">Toni
Calabrese</span></b><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH">,
MSc.</span><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH">Wissenschaftlicher
Projektmitarbeiter<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH"><a
href="mailto:toni.calabrese@spf.ch" moz-do-not-send="true"><span
style="color:#0065A3">toni.calabrese@spf.ch</span></a> |</span><span
style="font-size:10.0pt;color:#8C195F;mso-fareast-language:DE-CH">
</span><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH"><a
href="mailto:toni.calabrese@ost.ch" moz-do-not-send="true"><span
style="color:#0065A3">toni.calabrese@ost.ch</span></a></span><span
style="font-size:10.0pt;color:#8C195F;mso-fareast-language:DE-CH"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif;color:#8C195F;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH">T
+41 58 257 4827<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH">SPF
Institut für Solartechnik<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH">OST
– Ostschweizer Fachhochschule<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH">Oberseestr.
10 | CH-8640 Rapperswil | Switzerland |
</span><u><span
style="color:#8C195F;mso-fareast-language:DE-CH"><a
href="http://www.spf.ch" moz-do-not-send="true"><span
style="font-size:10.0pt;color:#8C195F">www.spf.ch</span></a></span></u><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH"> |
</span><u><span
style="color:#8C195F;mso-fareast-language:DE-CH"><a
href="http://www.ost.ch" moz-do-not-send="true"><span
style="font-size:10.0pt;color:#8C195F">www.ost.ch</span></a></span></u><span
style="font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:DE-CH"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;color:#1F497D;mso-fareast-language:DE-CH"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;color:#1F497D">OST
– Ostschweizer Fachhochschule ist der Zusammenschluss aus
FHS St.Gallen, HSR Rapperswil und NTB Buchs.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
TRNSYS-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a>
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a>
</pre>
</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
<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>
</body>
</html>