<div dir="ltr">Not sure which version you are looking at, but I believe you will need to go with a Appendix G System 5, sorry. That is officially considered a Fossil/Electric Hybrid system, not a preheat coil. See this ASHRAE interpretation for 90.1-2007:<div><br></div><div><a href="https://www.ashrae.org/File%20Library/docLib/StdsInterpretations/IC-90-1-2007-15.pdf">https://www.ashrae.org/File%20Library/docLib/StdsInterpretations/IC-90-1-2007-15.pdf</a><br></div><div><br></div><div>If you are looking at newer versions, there might be a more recent ASHRAE interpretation - worth investigating, but unlikely to have a different outcome based on their previous interpretation.</div><div><br></div><div>Cheers,</div><div>Elizabeth</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><b><br></b></div><div dir="ltr"><b>Elizabeth Gillmor <font size="1">PE, BEMP, LC, LEED AP</font></b><div><br></div><div><span style="font-size:large;background-color:rgb(255,255,255)"><b><font color="#38761d" face="arial, helvetica, sans-serif">e n e r g e t i c s </font></b></span><b><font color="#38761d" face="arial, helvetica, sans-serif" size="2">consulting engineers, llc</font></b></div><div><font size="2" style="background-color:rgb(255,255,255)" color="#666666"><a href="http://energetics-eng.com" target="_blank">energetics-eng.com</a> |</font><span style="color:rgb(102,102,102);font-size:small"> 303.619.0091</span></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">On Tue, Oct 18, 2016 at 11:41 AM, Jeff Ross-Bain via Equest-users <span dir="ltr"><<a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-US" link="#0563C1" vlink="#954F72">
<div class="m_-2939255181541131202WordSection1">
<p class="MsoNormal">Hi All,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">A 50,000 sf building we are looking at has electric DX cooling and electric heat VAV terminal boxes in the zones. The only gas use in this system is for a small pre-heat coil on the RTU and there is also an energy recovery ventilator. In
developing the Baseline model, <b>should we use System 5 (gas boiler) or go with System 6 (all electric)?</b><u></u><u></u></p>
<p class="MsoNormal"><br>
With gas, I know the default is to use Sys 5 but in this case the pre-heat is a very small part of the system so the “predominant” heating energy use is electric. The Baseline will still be modeled with the same gas pre-heater per Appendix G, either way.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Many thanks for your thoughts.<u></u><u></u></p>
<p class="MsoNormal">Regards,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Century Gothic",sans-serif;color:#006e78">Jeff Ross-Bain, PE, LEED Fellow</span></b><b><span style="font-size:8.0pt;font-family:"Century Gothic",sans-serif;color:#006e78"><u></u><u></u></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053">President<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><a href="tel:404-220-8955" value="+14042208955" target="_blank">404-220-8955</a></span><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><br>
</span><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#006e78"><a href="http://www.rbgb.com/" target="_blank">www.rbgb.com</a></span></b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#535053"><br>
<br>
</span><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#006e78">Build Green. Save Time. Save Money.<u></u><u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:7.5pt;font-family:"Century Gothic",sans-serif;color:#006e78"><u></u> <u></u></span></b></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div>
<br>______________________________<wbr>_________________<br>
Equest-users mailing list<br>
<a href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" rel="noreferrer" target="_blank">http://lists.onebuilding.org/<wbr>listinfo.cgi/equest-users-<wbr>onebuilding.org</a><br>
To unsubscribe from this mailing list send a blank message to <a href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@<wbr>ONEBUILDING.ORG</a><br>
<br></blockquote></div><br></div>