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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The first number is a laminar flow coefficient.<br>
You can look in the CONTAM documentation for details related to this value.<br>
There is also a LaminarCoef.zip file available in the files section of the Yahoo CONTAM user group that provides the calculation method.<br>
Suffice it to say it is utilized when flows are very low in order to prevent undefined derivatives dF/dP, required for solving the non-linear airflow equations, when pressure difference across flow paths approach zero.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Also, there is a new Type98 that utilizes the full capabilities of the CONTAM simulation engine.<br>
Type98 and associated utilities are available on the NIST CONTAM website.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">- Stuart<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> David BRADLEY [mailto:d.bradley@tess-inc.com]
<br>
<b>Sent:</b> Wednesday, October 15, 2014 10:01 AM<br>
<b>To:</b> Remon Lapisa; TRNSYS users mailing list at OneBuilding.org<br>
<b>Subject:</b> Re: [TRNSYS-users] TRNSYS input file (***.air)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Remon,<br>
The second number is the flow coefficient and the third number is the flow exponent in the equation that relates the flow through the opening to the pressure difference across the opening. I am not sure what the first value is or how it is computed.<br>
Kind regards,<br>
David<br>
<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">On 10/15/2014 01:06, Remon Lapisa wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="background:white"><span class="yiv0679567538"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">Hi everyone,</span></span><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">
<o:p></o:p></span></p>
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<p class="MsoNormal" style="background:white"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif"">In the TRNSYS input file of Contam (***.air) we will find some '<span class="yiv0679567538"><b><i>flow elements</i></b></span>' datas, consisting
of 3 values numbers on each line, like the example below (for 5 flow elements):<br>
<br>
....<br>
-999 wind pressure profiles:<br>
1 2 5<br>
0 -1 -0.00625 6.94444e-005 0<br>
90 -1 0.00625 6.94444e-005 -5.14403e-007<br>
180 -0.25 0.00625 -6.94444e-005 0<br>
270 -0.25 -0.00625 -6.94444e-005 5.14403e-007<br>
360 -1 0 0 0<br>
...etc<br>
<span class="yiv0679567538"><i>-999 <b>flow elements:</b></i></span><br>
1 <span class="yiv0679567538">0.0321663 0.94 0.5</span><br>
2 0.090255 1.87 0.5<br>
3 0.25528 3.74 0.5<br>
4 0.723488 7.49 0.5<br>
5 <span class="yiv0679567538"><b>0.0176262 1.08102 0.5</b></span><br>
.... etc<br>
<br>
<br>
In the example above, what values are represented by the 3 bold numbers (<span class="yiv0679567538"><b>0.0176262, 1.08102, 0.5)
</b>??</span><br>
<br>
How to calculate the value of <span class="yiv0679567538"><b>0.0176262</b></span>
<span class="yiv0679567538"><b>?</b></span> <br>
<br>
Thank for the help<br>
<br>
remon<o:p></o:p></span></p>
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<p class="MsoNormal"><br>
<br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>TRNSYS-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:TRNSYS-users@lists.onebuilding.org">TRNSYS-users@lists.onebuilding.org</a><o:p></o:p></pre>
<pre><a href="http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org</a><o:p></o:p></pre>
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<br>
<o:p></o:p></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>
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