<html>
  <head>
    <meta content="text/html; charset=ISO-8859-1"
      http-equiv="Content-Type">
  </head>
  <body bgcolor="#FFFFFF" text="#000000">
    yep.  how are you controlling the erv?  interlocked with the supply
    air fan so they're on all the time during occupied hours?  that'll
    do it.  you spend more energy running the wheel and those
    inefficient erv supply and erv exhaust fans than you save via the
    energy transfer of the wheel.<br>
    <br>
    my experience has been to set the ervs to function based on a delta
    t between the outdoor air and the exhaust air.  the best delta t
    will vary depending where your project is but in my hot/dry 2b zone
    i've found a delta t of 20 was good, a delta t of 26 was peak before
    the energy savings headed south again.<br>
    <br>
    also, you don't need to delete/remove the ervs to see energy
    savings.  just set up parametric runs with the different delta t you
    want to test at & you can compare the savings via the comparison
    reports.  just don't forget to a) set the parametric run for delta
    t, assign the unit(s) with ervs, and give it a delta t.  these are
    multiple inputs per air handler/erv.<br>
    <br>
    sample:<br>
    <br>
       <img src="cid:part1.08080506.05040102@gmail.com" alt=""><br>
    <br>
    On 11/30/12 12:59 PM, Andrew Clagett wrote:
    <blockquote
      cite="mid:1AD3159BE85E3844AC690932FF382A730324CFEC71D6@hargismail1"
      type="cite">
      <meta http-equiv="Content-Type" content="text/html;
        charset=ISO-8859-1">
      <meta name="Generator" content="Microsoft Word 14 (filtered
        medium)">
      <style><!--
/* Font Definitions */
@font-face
        {font-family:"Cambria Math";
        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:"Century Gothic";
        panose-1:2 11 5 2 2 2 2 2 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;}
span.EmailStyle17
        {mso-style-type:personal-compose;
        font-family:"Calibri","sans-serif";
        color:windowtext;}
.MsoChpDefault
        {mso-style-type:export-only;
        font-family:"Calibri","sans-serif";}
@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]-->
      <div class="WordSection1">
        <p class="MsoNormal">Hello all. After finalizing my building and
          obtaining what appeared to be reasonable output, I removed the
          ERV devices (modeled at 85% efficient cross-flow air to air
          heat exchangers) from the model to ascertain the energy
          savings attributable to those devices.<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">And my total energy consumption went <b>DOWN</b>
          over 6%! Inexplicably, ‘space cooling’ and ‘pumps & aux.’
          energy consumption has decreased by a  far larger amount than
          ‘space heating’ increased. I would have expected both of those
          values to increase along with the ‘space heating’ energy
          consumption (which did increase).<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Anyone have any idea why that might be?<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <div>
          <p class="MsoNormal"><b><span
                style="font-size:11.5pt;color:#244061">Andrew Clagett, </span></b><span
              style="font-size:9.0pt;color:gray">PE, LEED AP <o:p></o:p></span></p>
        </div>
        <div>
          <p class="MsoNormal"><span style="color:gray">Mechanical <o:p></o:p></span></p>
        </div>
        <p class="MsoNormal"><span style="color:gray">d |  206.436.0494
               </span><span
            style="font-size:9.0pt;font-family:"Times New
            Roman","serif";color:gray"> </span><span
            style="color:gray">o | 206.448.3376   </span><span
            style="font-size:9.0pt;font-family:"Times New
            Roman","serif";color:gray"> </span><span
            style="color:gray">e | <a class="moz-txt-link-abbreviated" href="mailto:andrewc@hargis.biz">andrewc@hargis.biz</a></span><span
            style="font-size:9.0pt;font-family:"Times New
            Roman","serif";color:gray"> </span><span
            style="color:gray">   <a moz-do-not-send="true"
              href="http://www.hargis.biz/vcards/Andrew%20Clagett.vcf"><span
                style="color:gray">v-card</span></a></span><span
            style="font-size:9.0pt;font-family:"Times New
            Roman","serif";color:gray"> <o:p></o:p></span></p>
        <div>
          <p class="MsoNormal" style="background:white"><span
              style="font-size:4.5pt;font-family:"Times New
              Roman","serif";color:gray"> <o:p></o:p></span></p>
        </div>
        <table class="MsoNormalTable" border="0" cellpadding="0"
          cellspacing="0">
          <tbody>
            <tr>
              <td style="padding:0in 0in 0in 0in">
                <p class="MsoNormal"><b><span
                      style="font-size:13.5pt;font-family:"Century
Gothic","sans-serif";color:#244061;letter-spacing:6.0pt">HARGIS</span></b><b><span
                      style="font-size:6.0pt;font-family:"Century
                      Gothic","sans-serif";letter-spacing:6.0pt"> </span></b><span
                    style="font-size:12.0pt;font-family:"Times New
                    Roman","serif""><o:p></o:p></span></p>
              </td>
              <td style="padding:0in 0in 0in 0in">
                <p class="MsoNormal"><span
                    style="font-size:10.5pt;color:#EEEEEE;background:#244061">     mechanical • electrical • telecommunications • security     </span><span
                    style="font-size:12.0pt;font-family:"Times New
                    Roman","serif""><o:p></o:p></span></p>
              </td>
            </tr>
          </tbody>
        </table>
        <p class="MsoNormal"><o:p> </o:p></p>
      </div>
      <br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
Equest-users mailing list
<a class="moz-txt-link-freetext" href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org">http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</a>
To unsubscribe from this mailing list send  a blank message to <a class="moz-txt-link-abbreviated" href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>