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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Dear TRNSYS users,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have some problems with the active layer module of TRNBLD, which I used for modeling a floor heating system.<o:p></o:p></p><p class=MsoNormal>The active layers, which should be displayed in the model, are defined as following:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Layer 1:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Pipe spacing: 24 cm<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Pipe outside diameter: 16 mm<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Pipe wall thickness: 2 mm<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Layer 2:<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Pipe spacing: 8 cm<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Pipe outside diameter: 16 mm<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]>Pipe wall thickness: 2 mm<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>By specifying the thicknesses of the layers adjacent to the active layers, the following curiosity appeared.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For case 1, I set the thickness of the layer above the active layer to 73 mm, which is greater than 0.3 times the pipe spacing, and I set the layer below to 0.5 times the pipe outside diameter (requirements taken from manual TRNSYS 17, 5-187, table). This step had worked pretty good and the simulation was running without any problems.<o:p></o:p></p><p class=MsoNormal>In a second step, I revised the model and included the second active layer into the TRNBLD model. As the floor screed should be identical for both cases, I tried to define the thicknesses of the adjacent layers the same way as I did it in case 1. But when I tried to reduce the thickness of the adjacent layer below, the following warning appeared: “thickness must be in the range of 0.024 to 1.0”.<o:p></o:p></p><p class=MsoNormal>In order to understand this warning I had a closer look to the manual of TRNBLD. On page 5-58 (TRNSYS 17) I found a remark that both layers adjacent to the active layer must be greater than 0.3 times pipe spacing. This would explain, why the warning appears, but I do not understand, why the first case should be unproblematic, as the required minimum thickness in this case should be 72mm and why this is not mentioned in the mathematical description.<o:p></o:p></p><p class=MsoNormal>Does anyone has an idea, what could be the reason behind that, or might this be a known or unknown bug? If this requirement dependent on the pipe spacing should be really used for both layers, this would mean that extremely thick floor screeds of +15cm are necessary to model a floor heating system with a pipe spacing of 24 cm. This sounds absolutely unrealistic. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hoping for some help,<o:p></o:p></p><p class=MsoNormal>Kind regards,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Johannes Schrade<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 style='margin-left:3.0pt;border-collapse:collapse;border:none'><tr><td style='border:solid gray 1.0pt;border-right:none;padding:7.5pt 7.5pt 7.5pt 7.5pt'><table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 style='margin-left:3.0pt;border-collapse:collapse;border:none'><tr><td style='border:solid gray 1.5pt;padding:3.0pt 3.0pt 3.0pt 3.0pt'><p class=MsoNormal style='mso-margin-top-alt:6.0pt;margin-right:3.0pt;margin-bottom:6.0pt;margin-left:3.0pt'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Johannes Schrade</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><br>Abteilung Wärmetechnik<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:6.0pt;margin-right:3.0pt;margin-bottom:6.0pt;margin-left:3.0pt'><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Fraunhofer-In</span><span lang=DE style='font-size:9.0pt;font-family:"Arial","sans-serif"'>stitut für Bauphysik<br>Nobelstr. 12<br>70569 Stuttgart<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:6.0pt;margin-right:3.0pt;margin-bottom:6.0pt;margin-left:3.0pt'><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><a href="mailto:johannes.schrade@ibp.fraunhofer.de"><span lang=DE style='color:blue'>johannes.schrade@ibp.fraunhofer.de</span></a></span><span lang=DE style='font-size:9.0pt;font-family:"Arial","sans-serif"'><br>Telefon 0711 / 970-3416<br>Telefax 0711 / 970-3399<br></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><a href="http://www.ibp.fraunhofer.de/wt/" target="_blank"><span lang=DE style='color:blue'>www.ibp.fraunhofer.de/wt/</span></a></span><span lang=DE style='font-size:9.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p></td></tr></table></td><td style='border:solid gray 1.0pt;border-left:none;padding:7.5pt 7.5pt 7.5pt 7.5pt'><table class=MsoNormalTable border=1 cellspacing=0 cellpadding=0 style='margin-left:3.0pt;border-collapse:collapse;border:none'><tr><td style='border:solid gray 1.5pt;padding:3.0pt 3.0pt 3.0pt 3.0pt'><p class=MsoNormal style='mso-margin-top-alt:6.0pt;margin-right:3.0pt;margin-bottom:6.0pt;margin-left:3.0pt'><b><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Johannes Schrade</span></b><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><br>Department Heat Technology <o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:6.0pt;margin-right:3.0pt;margin-bottom:6.0pt;margin-left:3.0pt'><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'>Fraunhofer Institute for Building Physics<br>Nobelstr. </span><span lang=DE style='font-size:9.0pt;font-family:"Arial","sans-serif"'>12<br>70569 Stuttgart, Germany<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:6.0pt;margin-right:3.0pt;margin-bottom:6.0pt;margin-left:3.0pt'><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><a href="mailto:johannes.schrade@ibp.fraunhofer.de"><span lang=DE style='color:blue'>johannes.schrade@ibp.fraunhofer.de</span></a></span><span lang=DE style='font-size:9.0pt;font-family:"Arial","sans-serif"'><br>Phone +49 711 / 970-3416<br>Fax +49 711 / 970-3399<br></span><span style='font-size:9.0pt;font-family:"Arial","sans-serif"'><a href="http://www.ibp.fraunhofer.de/wt/" target="_blank"><span lang=DE style='color:blue'>www.ibp.fraunhofer.de/wt/</span></a></span><span lang=DE style='font-size:9.0pt;font-family:"Arial","sans-serif"'><o:p></o:p></span></p></td></tr></table></td></tr></table><p class=MsoNormal><span lang=DE><o:p> </o:p></span></p></div></body></html>