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<TITLE>Type 56 active layer error : inlet fluid mass flow to low (simulating concrete core activation)</TITLE>
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<P><FONT SIZE=2 FACE="Arial">Hi!</FONT>
<BR><FONT SIZE=2 FACE="Arial">I'm currently trying to simulate concrete core activation in a multi-zone building.</FONT>
<BR><FONT SIZE=2 FACE="Arial">But when I input a certain mass flow rate into the active layer, the mass flow needs to be above a minimum value!?!</FONT>
<BR><FONT SIZE=2 FACE="Arial">This is strange since there should be no minimum flow rate, in reality flow rates can vary from zero to a limited flow rate maximum!</FONT></P>
<P><FONT SIZE=2 FACE="Arial">What causes this error and/or is there a known workaround?</FONT>
<BR><FONT SIZE=2 FACE="Arial">I work with prebid 5.0.8 and trnsys 15 with iisibat 3 (version 3.0.0.26) Reg. Num.=15B-B011</FONT>
<BR><FONT SIZE=2 FACE="Arial">Thanks!</FONT>
<BR><FONT SIZE=2 FACE="Arial">Pieter</FONT>
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<P><FONT SIZE=2 FACE="Arial">BASIC INPUTS (see also .lst-file in attachment)</FONT>
<BR><FONT SIZE=2 FACE="Arial">Wall (ceiling) with active layer:</FONT>
<BR><FONT SIZE=2 FACE="Arial">0.10m concrete</FONT>
<BR><FONT SIZE=2 FACE="Arial">0.00m active layer (0.20m pipe spacing, 0.02m diameter, …)</FONT>
<BR><FONT SIZE=2 FACE="Arial">0.15m concrete</FONT>
<BR><FONT SIZE=2 FACE="Arial">0.20m mineral wool</FONT>
<BR><FONT SIZE=2 FACE="Arial">Active layer specifications:</FONT>
<BR><FONT SIZE=2 FACE="Arial">Inlet temp 20C</FONT>
<BR><FONT SIZE=2 FACE="Arial">Inlet mass flow rate 500 kg/h</FONT>
<BR><FONT SIZE=2 FACE="Arial">Number of fluid loops 10</FONT>
<BR><FONT SIZE=2 FACE="Arial">(additional) Gain 0 kJ/h</FONT>
<BR><FONT SIZE=2 FACE="Arial">Area 100m2</FONT>
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<P><FONT SIZE=2 FACE="Arial">These inputs generate the errors below.</FONT>
<BR><FONT SIZE=2 FACE="Arial">Other values generate the same error, but with different minimum values of the specific mass flow rate (eg. 0.10m pipe spacing and inlet flow rate 2000kg/h : below min value 27.79kg/m2h error)</FONT></P>
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<P><FONT SIZE=2 FACE="Arial"> ***** ERROR ***** TRNSYS ERROR # </FONT>
<BR><FONT SIZE=2 FACE="Arial"> UNIT 7 TYPE 56 MULTIZONE BUILDING</FONT>
<BR><FONT SIZE=2 FACE="Arial"> SPECIFIC FLUID MASS FLOW OF ACTIVE LAYER IN SURFACE 7 BELOW MINIMUM VALUE OF 6.58 KG/M2H.</FONT>
<BR><FONT SIZE=2 FACE="Arial"> SIMULATION STOPPED.</FONT>
<BR><FONT SIZE=2 FACE="Arial"> PLEASE REPLACE THIS WALL WITH TWO OR MORE WALLS OF THIS TYPE AND CONNECT THEM</FONT>
<BR><FONT SIZE=2 FACE="Arial"> IN SERIAL FLUID FLOW WITHIN THE DECK FILE BY CONNECTING ADEQUATE INPUTS AND OUTPUTS TO TYPE 56.</FONT>
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<P><FONT SIZE=2 FACE="Arial"> ***** ERROR ***** TRNSYS ERROR # 191</FONT>
<BR><FONT SIZE=2 FACE="Arial"> UNIT 7 TYPE 56 MULTIZONE BUILDING</FONT>
<BR><FONT SIZE=2 FACE="Arial"> SUBROUTINE INVERT WAS CALLED FROM SUBROUTINE INVPAR WITH A SINGULAR</FONT>
<BR><FONT SIZE=2 FACE="Arial"> MATRIX.</FONT>
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<P><FONT SIZE=2 FACE="Arial"> ***** ERROR ***** TRNSYS ERROR # 191</FONT>
<BR><FONT SIZE=2 FACE="Arial"> UNIT 7 TYPE 56 MULTIZONE BUILDING</FONT>
<BR><FONT SIZE=2 FACE="Arial"> SUBROUTINE INVERT WAS CALLED FROM SUBROUTINE INVPAR WITH A SINGULAR</FONT>
<BR><FONT SIZE=2 FACE="Arial"> MATRIX.</FONT>
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<P><B><FONT SIZE=2 FACE="Arial">Pieter Maerien</FONT></B>
<BR><FONT SIZE=2 FACE="Arial">ir. architect</FONT><SPAN LANG="nl"> </SPAN>
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<P><B><SPAN LANG="nl-be"><FONT FACE="Arial">Arteum Architects</FONT></SPAN></B><SPAN LANG="nl-be"><BR>
<FONT SIZE=2 FACE="Arial">Frans Smoldersstraat 18</FONT></SPAN>
<BR><SPAN LANG="nl-be"><FONT SIZE=2 FACE="Arial">B 1932 Zaventem</FONT></SPAN>
<BR><SPAN LANG="nl-be"><FONT SIZE=2 FACE="Arial">T +32 2 711 28 69</FONT></SPAN>
<BR><SPAN LANG="de"><FONT SIZE=2 FACE="Arial">F +32 2 725 45 02</FONT></SPAN>
<BR><SPAN LANG="de"><FONT SIZE=2 FACE="Arial">E </FONT></SPAN><A HREF="mailto:voornaam.naam@grontmij.be"><SPAN LANG="de"><U><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">pieter.maerien@grontmij.be</FONT></U></SPAN></A><SPAN LANG="de"></SPAN>
<BR><SPAN LANG="de"><FONT SIZE=2 FACE="Arial">W </FONT></SPAN><A HREF="file://www.grontmij.be"><SPAN LANG="de"><U><FONT COLOR="#0000FF" SIZE=2 FACE="Arial">www.grontmij.be</FONT></U></SPAN></A><SPAN LANG="de"></SPAN>
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<P><SPAN LANG="nl-be"><FONT FACE="Arial" SIZE=2 COLOR="#000000"> <<NewProject2_betonkern_error2.lst>> </FONT></SPAN>
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