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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Philip,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">I agree that this definition isn’t very clear for adjacent walls.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">In general, the first layer of a wall construction is facing the zone/airnode.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">A non-adjacent wall is always FRONT. You don’t need to define front/back because only one side of the construction can face
the zone/airnode.<br>
<br>
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">For adjacent walls only one wall construction is defined and it isn’t clear to which of the 2 zones/airnodes the first layer
of the defined wall construction is facing.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy">Therefore, you need to define FRONT/BACK with respect to your wall construction definition.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><st1:City w:st="on"><st1:place w:st="on"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:
Arial;color:navy">Marion</span></font></st1:place></st1:City><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:
Arial;color:navy"><o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span lang="EN-GB" style="font-size:10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
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<p class="MsoNormal"><b><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma;color:windowtext;font-weight:bold">Von:</span></font></b><font size="2" color="black" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma;
color:windowtext">
TRNSYS-users [mailto:trnsys-users-bounces@lists.onebuilding.org] <b><span style="font-weight:
bold">Im Auftrag von
</span></b>Philip<br>
<b><span style="font-weight:bold">Gesendet:</span></b> Mittwoch, 30. Juli 2014 10:10<br>
<b><span style="font-weight:bold">An:</span></b> David BRADLEY; trnsys-users@lists.onebuilding.org<br>
<b><span style="font-weight:bold">Betreff:</span></b> Re: [TRNSYS-users] Setting "front / back" coupling for interzonal airchange in type 56 - TRNFLOW interaction?</span></font><font color="black"><span style="color:windowtext"><o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Dear David,<br>
<br>
Thanks a lot for your helpful answer!<br>
I got the airflow part right.<br>
<br>
However, the front/back issue is not clear to me and I could not find an explanation in the documentation.<br>
Please have a look at the following sketch:<o:p></o:p></span></font></p>
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<font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">is this the correct setting?<o:p></o:p></span></font>
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<img width="616" height="610" id="_x0000_i1025" src="cid:image001.jpg@01CFABE4.BE2431D0"><br>
<br>
<br>
<br>
Sorry for the probably easy question, but at least for me it is not totally clear how to define it.<br>
<br>
Thanks a lot!!<br>
<br>
Philip<br>
<br>
<br>
<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">On 7/25/2014 9:38 PM, David BRADLEY wrote:<o:p></o:p></span></font></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt" cite="mid:53D2A42D.8090501@tess-inc.com" type="cite">
<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Philip,<br>
When you define a coupling air flow rate through an ADJACENT wall, a quantity of air from the ADJACENT zone enters the active zone. In your first picture below, 90 kg/h of air would enter zone AT_109 from airnode R_107. If you click on the little green arrow
button that allows you to set whether the flow is constant, scheduled, or an input, you will see a note explaining what the conditions of the air entering the zone will be. If you want air to flow the other direction as well (from AT_109 to R_107) you have
to define that separately in zone R_107. <br>
<br>
The front/back switch has to do with the thermal model and which surface of the wall is in a given zone.<br>
Kind regards,<br>
David<br>
<br>
<br>
<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">On 7/25/2014 08:05, Philip wrote:<o:p></o:p></span></font></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt" cite="mid:53D2562F.4040106@gmx.de" type="cite">
<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Dear All,<br>
<br>
I could not find an explanation on the coupling "front/back", see below.<br>
<br>
I want to model an inter-zonal airchange between 2 zones (AT_009 and R_007- <u>green arrow in the screenshot</u>), so I have to define one zone as "<b><span style="font-weight:bold">front</span></b>" and one as "<b><span style="font-weight:bold">back</span></b>"
and define the same coupling rate in both zones.<o:p></o:p></span></font></p>
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<font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">But does it make any difference which is defined as front and which as back?<o:p></o:p></span></font>
</li></ul>
<p><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">There is also a
<b><span style="font-weight:bold">TRNFLOW </span></b>Network that connects some other zones (AT_009 and AT_109 etc. ..) in order to realize<b><span style="font-weight:bold"> night ventilation</span></b> through an Atrium.<o:p></o:p></span></font></p>
<p><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">The zone
<b><span style="font-weight:bold">R_007 is not connected to the TRNFLOW network</span></b>, but I guess it would make sense to link it?<o:p></o:p></span></font></p>
<p><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Any help highly appreciated!!!<o:p></o:p></span></font></p>
<p><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt">Thanks, and have a nice weekend,<br>
Philip<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" color="black" face="Times New Roman"><span style="font-size:12.0pt"><o:p> </o:p></span></font></p>
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