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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'>What you mean by: ‘</span><span lang=EN-US>simply to define some arbitrary (usually high) mixing rate between the two parts of the zone’</span><span lang=EN-US style='color:#1F497D'> ?<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'>How to define this mixing rate, where should I do this? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='color:#1F497D'>If I use VirtualSurface between two zones there are no possibility to make ‘coupling air flow’. VirtualSurface is invisible in TRNBuild.<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 </span><span lang=EN-US style='color:red'><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 #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:PL'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:PL'> David BRADLEY [mailto:d.bradley@tess-inc.com] <br><b>Sent:</b> Friday, September 30, 2011 6:49 PM<br><b>To:</b> Karol Bandurski<br><b>C</b></span><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:PL'>c:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext;mso-fareast-language:PL'> trnsys-users@cae.wisc.edu<br><b>Subject:</b> Re: [TRNSYS-users] mix air (convection) of two zones of not rectangular room<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Karol,<br> Unless you are concerned about the radiation exchange within the zone (and have selected the detailed zone geometry model) you don't really need to worry about having only concave zones. Having said that, there are a few options for estimating the air exchange between air nodes. The simplest method is simply to define some arbitrary (usually high) mixing rate between the two parts of the zone. This will keep the two zones at approximately the same temperature. The other alternative is to use either TRNFlow, COMIS, or CONTAM/Type97 to predict the air exchange rate based on the temperature and pressure differences between the two air nodes. These second alternatives are a significant amount of work so I would first look at your building's energy consumption assuming that there is no air exchange between the two zones, then look at the energy consumption assuming significant air exchange. If there isn't a big difference you know that the building isn't very sensitive to the air exchange rate and you can save yourself the time of modeling it by setting an arbitrary air exchange rate to achieve a realistic level of comfort difference between the two zones.<br>kind regards,<br> David<br> <br><br>On 9/29/2011 04:08, Karol Bandurski wrote: <o:p></o:p></p><p class=MsoNormal><span lang=EN-US>Hi,</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>The problem is from Type 56.</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 house with few rooms which are not rectangular, they are concave. So, I can’t make one room=one zone.</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 divided room on rectangles to make zones, and walls between zones of one room are VirtualSurface. Radiation is seemed OK, but air between two zones of one room isn’t mixed…</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>What can I do? Is it possible to solve this problem in TRNBuild or I have to go outside Type 56 and operate in Simulation Studio?</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>Regard,</span><o:p></o:p></p><p class=MsoNormal><span lang=EN-US>Karol</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@cae.wisc.edu">TRNSYS-users@cae.wisc.edu</a><o:p></o:p></pre><pre><a href="https://mailman.cae.wisc.edu/listinfo/trnsys-users">https://mailman.cae.wisc.edu/listinfo/trnsys-users</a><o:p></o:p></pre><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>