<html 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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=koi8-r">
<meta name="Generator" content="Microsoft Word 14 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:Cambria;
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
p.Normal, li.Normal, div.Normal
{mso-style-name:"\[Normal\]";
margin:0in;
margin-bottom:.0001pt;
text-autospace:none;
font-size:12.0pt;
font-family:"Arial","sans-serif";}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.EmailStyle19
{mso-style-type:personal;
font-family:"Calibri","sans-serif";
color:#1F497D;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle22
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal">Hello All,<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal">I’m wondering about fan autosizing in eQuest. When we select “variable speed” fan control, the fan energy plummets by 80-90%. Report SS-L (attached below) shows the first fan only running about 60% for 4 hours per year, and never running
above 70%. This is typical across all 10 systems in the building – with the exception of 1 zone that runs above 60% for 36 hours per year and above 90% for 4 hours per year.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The result of this is that when “variable speed” is chosen, ~90% of the fan energy goes away. Any idea why the ‘autosized’ fan is so much bigger than is needed? We’re finding this situation on a lot of models that we review, and it’s
making savings from VFDs seem much bigger than what is measured in the field. How should we be modeling this?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance,<o:p></o:p></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>
<p class="MsoNormal" style="line-height:115%"><b><span style="font-family:"Cambria","serif";color:#000066">Christopher Cox</span></b><span style="font-family:"Cambria","serif";color:#000066"> </span><span style="font-family:"Arial","sans-serif";color:#999999">”</span><span style="font-family:"Cambria","serif";color:#000066">
</span><b><span style="font-family:"Cambria","serif";color:#999999">Engineer</span></b><b><span style="font-family:"Cambria","serif";color:#000066">
</span></b><b><span style="font-family:"Arial","sans-serif";color:#999999">”</span></b><b><span style="font-family:"Cambria","serif";color:#000066">
</span></b><b><span style="font-family:"Cambria","serif";color:#999999">Demand Management(DM)<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="color:#000066">Nexant, Inc.<b> </b></span><b><span style="font-family:"Arial","sans-serif";color:#999999">”</span></b><b><span style="color:#000066">
</span></b><span style="color:#999999">4021 S 700 E #250</span><span style="color:#000066">
</span><span style="font-family:"Arial","sans-serif";color:#999999">”</span><span style="color:#000066"> </span><span style="color:#999999">SLC, UT 84107 </span><span style="font-family:"Arial","sans-serif";color:#999999">”</span><span style="color:#999999">
O| 801.639.5632 </span><span style="font-family:"Arial","sans-serif";color:#999999">”</span><span style="color:#999999"> F| 801.266.4786
</span><span style="font-family:"Arial","sans-serif";color:#999999">”</span><span style="color:#999999"> E|</span><span style="color:#000066">
<a href="mailto:ccox@nexant.com">ccox@nexant.com</a></span><span style="color:#1F497D"><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>
<p class="MsoNormal">I’ve attached the .inp and .pd2 files for your reference, but want to point out these 2 inputs:<o:p></o:p></p>
<p class="MsoNormal">Sizing ratio: = 1.00<o:p></o:p></p>
<p class="MsoNormal">Sizing option: = Coincident (but irrelevant because only one zone on this system).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> FAN ELEC FAN ELEC FAN ELEC FAN ELEC -------- Number of hours within each PART LOAD range --------- TOTAL<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> DURING DURING DURING DURING 00 10 20 30 40 50 60 70 80 90 100 RUN<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> HEATING COOLING HEAT & COOL FLOATING 10 20 30 40 50 60 70 80 90 100 + HOURS<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New"">MONTH (KWH) (KWH) (KWH) (KWH)<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New"">----- ----------- ----------- ----------- ----------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> JAN 1.344 0.109 0.000 0.184 466 2 1 0 0 0 0 0 0 0 0 469<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> FEB 0.741 1.575 0.000 0.302 326 13 9 7 1 0 0 0 0 0 0 356<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> MAR 0.355 6.352 0.000 0.478 273 52 18 11 14 5 0 0 0 0 0 373<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> APR 0.158 8.066 0.000 0.376 203 48 27 20 20 2 0 0 0 0 0 320<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> MAY 0.042 12.987 0.000 0.267 131 99 63 49 19 0 0 0 0 0 0 361<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> JUN 0.003 15.799 0.000 0.062 64 115 123 58 11 0 0 0 0 0 0 371<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> JUL 0.000 22.947 0.000 0.000 17 108 108 68 47 8 0 0 0 0 0 356<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> AUG 0.000 32.307 0.000 0.007 18 98 112 95 48 35 0 0 0 0 0 406<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> SEP 0.000 25.667 0.000 0.057 51 133 72 39 34 39 4 0 0 0 0 372<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> OCT 0.113 17.743 0.000 0.343 170 51 31 24 25 28 8 0 0 0 0 337<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> NOV 0.445 2.875 0.000 0.493 294 12 9 12 5 1 0 0 0 0 0 333<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> DEC 1.179 0.010 0.000 0.287 448 0 0 0 0 0 0 0 0 0 0 448<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> ----------- ----------- ----------- ----------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""> ANNUAL 4.381 146.437 0.000 2.857 2461 731 573 383 224 118 12 0 0 0 0 4502<o:p></o:p></span></p>
<p class="Normal"><span style="font-size:8.0pt;font-family:"Courier New""><o:p> </o:p></span></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"><o:p> </o:p></p>
</div>
</body>
</html>