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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Energy savings in cooling tower fans are a result of the ability for turndown when heat loads are less than the full capacity of the cooling tower. You will not see any savings if the heat load in the condenser water loop does not vary. In a similar manner, if the heat load does decrease but the fans remain running at full speed in order to drive down the condenser water temperature, there will not be any savings. You may want to check if there is a condenser water temperature reset which is not being utilized.<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><b><span style='font-size:11.5pt;font-family:"Arial","sans-serif";color:#605F4B'>Jason Millheim, P.E., LEED AP<o:p></o:p></span></b></p><p class=MsoNormal><i><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'>Mechanical Engineer<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'>Commercial + Industrial</span></i><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'>Working with Energy Trust of Oregon<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'>541.770.5884 </span><b><span style='font-size:7.0pt;font-family:"Arial","sans-serif";color:#605F4B;letter-spacing:.6pt'>DIREC</span></b><b><span style='font-size:7.0pt;font-family:"Arial","sans-serif";color:#605F4B'>T<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'>541.842.0120 </span><b><span style='font-size:7.0pt;font-family:"Arial","sans-serif";color:#605F4B;letter-spacing:.6pt'>CELL</span></b><b><span style='font-size:7.0pt;font-family:"Arial","sans-serif";color:#605F4B'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'>541.770.7477 </span><b><span style='font-size:7.0pt;font-family:"Arial","sans-serif";color:#605F4B;letter-spacing:.6pt'>FAX</span></b><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#605F4B'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#42C4DD'><a href="http://www.energytrust.org/" title="http://www.energytrust.org/"><span style='color:#42C4DD'>energytrust.org</span></a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Verdana","sans-serif";color:#42C4DD'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:gray'>This email is intended for its addressee(s) and may contain confidential information. If you receive this email in error, please notify me and delete it promptly. Thank you.</span><span style='font-size:11.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#42C4DD'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:gray'>+</span></b><b><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:gray'> </span></b><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:gray'>Please consider the environment before printing this email.</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif";color:gray'><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><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> R B [mailto:slv3sat@gmail.com] <br><b>Sent:</b> Tuesday, June 04, 2013 9:57 AM<br><b>To:</b> RobertWichert; eQUEST Users List<br><b>Subject:</b> Re: [Equest-users] Cooling tower - Two-speed vs VFD fan, bug?<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>The default on vfd is 40%. I see savings compared to every other option - one-speed, discharge damper etc. None of them use the fan-speed vs power fan curve except two-speed and vfd options. So, basically both are working in the same way with a penalty of vfd losses in the vfd case? I would think that the two-speed option will not need a curve.<o:p></o:p></p></div><div><p class=MsoNormal>Thanks, <o:p></o:p></p></div><div><p class=MsoNormal>-Rohini<o:p></o:p></p></div></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Tue, Jun 4, 2013 at 8:37 AM, RobertWichert <<a href="mailto:robert@wichert.org" target="_blank">robert@wichert.org</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal>I recall having to pick the "minimum speed ratio" box or something like that before the VFD would show savings.<br><br>Have you set that?<br><br><br><br><o:p></o:p></p><pre>Robert Wichert P.Eng. LEED AP BD&C<o:p></o:p></pre><pre><a href="tel:%2B1%20916%20966%209060" target="_blank">+1 916 966 9060</a><o:p></o:p></pre><pre>FAX <a href="tel:%2B1%20916%20966%209068" target="_blank">+1 916 966 9068</a><o:p></o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre><o:p> </o:p></pre><pre>===============================================<o:p></o:p></pre><div><div><p class=MsoNormal>On 6/3/2013 7:22 PM, R B wrote:<o:p></o:p></p></div></div></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><div><div><div><p class=MsoNormal>Hi all, <o:p></o:p></p></div><div><p class=MsoNormal>Has anyone tried to see the savings associated with upgrading two-speed fan to VFD in a cooling tower? I see increased energy use due to the vfd. on further digging, it looks to me that both two-speed and vfd fans use the same fan performance curve. Is this the case or am I missing something?<o:p></o:p></p></div><div><p class=MsoNormal>Thanks in advance,<o:p></o:p></p></div><div><p class=MsoNormal>-Rohini<o:p></o:p></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p></div></div><pre>_______________________________________________<o:p></o:p></pre><pre>Equest-users mailing list<o:p></o:p></pre><pre><a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target="_blank">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a><o:p></o:p></pre><pre>To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG" target="_blank">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a><o:p></o:p></pre></blockquote><p class=MsoNormal><o:p> </o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>