<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-size: 13px;color: rgb(0, 0, 0);font-family: arial, sans-serif;">If you input a tower with a lower approach but with the same fan power, you would wind up with less annual fan energy consumption, because your fan with the lower approach temperature would hit the minimum condenser water temperature at a higher wet-bulb temperature, allowing the fan to back off more hours of the year. <br><br><blockquote style="padding-left: 5px; margin-left: 0px; border-left: #0000ff 2px solid; font-weight: normal; font-style: normal; text-decoration: none; font-size: 10pt; font-family: arial,sans-serif; color: black;">-----Original Message-----
<br>From: "Peters, Judith M via Bldg-sim" <bldg-sim@lists.onebuilding.org>
<br>Sent: Jun 19, 2017 11:13 AM
<br>To: "bldg-sim@lists.onebuilding.org" <bldg-sim@lists.onebuilding.org>
<br>Subject: [Bldg-sim] Cooling Tower Approach
<br><br><zzzhtml xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><zzzhead><zzzmeta http-equiv="Content-Type" content="text/html; charset=us-ascii"><zzzmeta name="Generator" content="Microsoft Word 14 (filtered medium)"><style><ZZZ!--
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</o:idmap></o:shapelayout></xml><zzz![endif]--></zzz![endif]--></zzz!--[if></zzz![endif]--></zzz!--[if></zzzmeta></zzzmeta></zzzhead><zzzbody lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal">I am looking for tips on how to properly compare tower approach temps. Currently, I am comparing a 7 F approach with a 5 F approach. The tower has 4 cells with 44 kW fan energy for each cell and a 10 F range. <o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Regardless of control parameters, the program shows less tower energy for a smaller approach and I was expecting the opposite.<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Can anyone shed some light on this issue?<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Thank you!<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><b><span style="color:#0D0D0D">Judy Peters, PE LEED-AP BEMP<o:p></o:p></span></b></p><p class="MsoNormal"><span style="color:#0D0D0D">Energy Modeling Engineer<o:p></o:p></span></p><p class="MsoNormal"><b><span style="color:#0D0D0D">Daikin Applied<o:p></o:p></span></b></p><p class="MsoNormal"><span style="color:#0D0D0D">763.553.5155<o:p></o:p></span></p><p class="MsoNormal"><u><span style="color:blue"><a target="_blank" href="mailto:judith.peters@daikinapplied.com"><span style="color:blue">judith.peters@daikinapplied.com</span></a></span></u><span style="color:#0D0D0D"> | <a target="_blank" href="http://www.daikinapplied.com/"><span style="color:blue">www.DaikinApplied.com</span></a><o:p></o:p></span></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><o:p> </o:p></p></div></zzzbody></zzzhtml></bldg-sim@lists.onebuilding.org></bldg-sim@lists.onebuilding.org></blockquote></div></body></html>