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<p class=MsoNormal><span style='color:#1F497D'>Sorry David, my wording was very
poor. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>What I was trying to get at is
that the approach temperatures appear too small.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I have 22C air entering the coil
and 29C air leaving the coil. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I have 32C water entering the
coil and 25C water leaving the coil. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>That is a delta T of just 3C, or
5.4F between the air entering and the water leaving. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>It should be about 7-10F based
on project experience. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>This might be splitting hairs,
but with 500,000 CFM of air flow, 1 degree means thousands of dollars. Therefore,
every item gets scrutinized. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Also, I was hoping there was a
way to set the effectiveness on the cooling coil like I was able to on the
heating coil. <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Fred<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:10.0pt;color:#660000;text-transform:uppercase'>Fred Betz</span></b><b><span
style='font-size:9.0pt;color:#333333'> </span></b><span
style='font-size:9.0pt;color:#333333'>PhD., LEED AP <br>
</span><span style='font-size:10.0pt;color:#333333;text-transform:uppercase'>Sustainable
Systems Analyst</span><span style='font-size:9.0pt;color:#333333'><o:p></o:p></span></p>
</td>
<td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:9.0pt;color:#333333'> <o:p></o:p></span></p>
</td>
<td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span
style='font-size:9.0pt;color:#660000'>AEI</span></b><span style='font-size:
9.0pt;color:#333333'> | AFFILIATED ENGINEERS, INC. <br>
5802 Research Park Blvd. | Madison, WI 53719<br>
<br>
</span><span style='font-size:9.0pt;color:#660000'>P: 608.236.1175 | F:
608.238.2614</span><span style='font-size:9.0pt;color:#333333'> <br>
</span><span style='font-size:9.0pt;color:#660000'><a
href="mailto:fbetz@aeieng.com"><span style='color:#660000;text-decoration:
none'>fbetz@aeieng.com</span></a> | </span><b><span
style='font-size:9.0pt;color:#660000'><a href="http://www.aeieng.com/"><span
style='color:#660000;text-decoration:none'>www.aeieng.com</span></a></span></b><span
style='font-size:9.0pt;color:#333333'> <o:p></o:p></span></p>
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='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:bradley@tess-inc.com] <br>
<b>Sent:</b> Monday, March 29, 2010 4:18 PM<br>
<b>To:</b> Fred Betz<br>
<b>Cc:</b> trnsys-users@cae.wisc.edu<br>
<b>Subject:</b> Re: [TRNSYS-users] Heating Coil: Type 670-1 bug<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Fred,<br>
I think you might be confusing efficiency and effectiveness.
Effectiveness is actual energy transfer divided by maximum theoretically
possible energy transfer. The air and water side heat transfers need to be
equal or else there is an energy imbalance across the coil.<br>
Best,<br>
David<br>
<br>
<br>
Fred Betz wrote: <o:p></o:p></p>
<p class=MsoNormal>All,<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>There appears to be a bug in the Type 670-1 heating coil. <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>I set the effectiveness of the coil to 0.70, but the air and
water side heat transfer rates are approximately equal. <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Anyone have a fix?<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>Fred<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'>
<tr>
<td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><b><span style='font-size:10.0pt;color:#660000;text-transform:
uppercase'>Fred Betz</span></b><b><span style='font-size:9.0pt;color:#333333'>
</span></b><span style='font-size:9.0pt;color:#333333'>PhD., LEED AP <br>
</span><span style='font-size:10.0pt;color:#333333;text-transform:uppercase'>Sustainable
Systems Analyst</span><o:p></o:p></p>
</td>
<td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><span style='font-size:9.0pt;color:#333333'> </span><o:p></o:p></p>
</td>
<td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'>
<p class=MsoNormal><b><span style='font-size:9.0pt;color:#660000'>AEI</span></b><span
style='font-size:9.0pt;color:#333333'> | AFFILIATED ENGINEERS, INC. <br>
5802 Research Park Blvd. | Madison, WI 53719<br>
<br>
</span><span style='font-size:9.0pt;color:#660000'>P: 608.236.1175 | F: 608.238.2614</span><span
style='font-size:9.0pt;color:#333333'> <br>
</span><span style='font-size:9.0pt;color:#660000'><a
href="mailto:fbetz@aeieng.com"><span style='color:#660000;text-decoration:
none'>fbetz@aeieng.com</span></a> | <b><a
href="http://www.aeieng.com/"><span style='color:#660000;text-decoration:
none'>www.aeieng.com</span></a></b></span><span style='font-size:9.0pt;
color:#333333'> </span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<pre><o:p> </o:p></pre><pre style='text-align:center'>
<hr size=4 width="90%" align=center>
</pre><pre><o:p> </o:p></pre><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://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users">https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users</a><o:p></o:p></pre><pre> <o:p></o:p></pre>
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<br>
<o:p></o:p></span></p>
<pre>-- <o:p></o:p></pre><pre>***********************************************************************<o:p></o:p></pre><pre>Thermal Energy System Specialists (TESS), LLC <o:p></o:p></pre><pre>David BRADLEY 22 N. Carroll Street - Suite 370 <o:p></o:p></pre><pre>Partner Madison, WI 53703 <o:p></o:p></pre><pre> USA<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>E-mail: <a
href="mailto:bradley@tess-inc.com">bradley@tess-inc.com</a> <o:p></o:p></pre><pre>Web Pages: <a
href="http://www.tess-inc.com">http://www.tess-inc.com</a> and <a
href="http://www.trnsys.com">http://www.trnsys.com</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre>***********************************************************************<o:p></o:p></pre></div>
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