Lan,<br><br>Since you said that your rooftop unit which is providing your outside air uses gas, I think you have modeled it correctly. Something you might want to do is look at using a different thermostat schedule for your electric resistance heaters, It sounds like it might be justifiable to set them to meet a lower heating temperature. As long as you keep the schedule for them the same between the baseline and the proposed building you should be okay..<br>
<br>Carol<br><br><br><br><div class="gmail_quote">On Thu, Jun 30, 2011 at 2:48 PM, Paul Diglio <span dir="ltr"><<a href="mailto:paul.diglio@sbcglobal.net">paul.diglio@sbcglobal.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div><div style="font-family:times new roman,new york,times,serif;font-size:10pt"><div>Lan:<br><br>90.1-2007 requires a system 5 with a fossil fuel hot water boiler as you have modeled, but in 90.1-2007 Table G3.1 Number 10 HVAC Systems Base Building Performance column it states that you need to meet any system-specific requirements in Section G3.1.3.<br>
<br>In G3.1.3.2, it states that for system 5, the boiler plant shall use the same fuel as the proposed design, which in your case is electric resistance and compressor heat pump energy. I would model electric hot water boilers.<br>
<br>Paul Diglio<br></div><div style="font-family:times new roman,new york,times,serif;font-size:10pt"><br><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><font face="Tahoma" size="2"><hr size="1">
<b><span style="font-weight:bold">From:</span></b> "Li, Lan"
<<a href="mailto:lli@sbmce.com" target="_blank">lli@sbmce.com</a>><br><b><span style="font-weight:bold">To:</span></b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b><span style="font-weight:bold">Sent:</span></b> Thu, June 30, 2011 4:24:27 PM<br><b><span style="font-weight:bold">Subject:</span></b> [Equest-users] LEED review comments for System 5 heating source<br></font><div><div>
</div><div class="h5"><br>
<div>
<p class="MsoNormal"><font face="Calibri" size="2"><span style="font-size:11pt;font-family:Calibri">Dear eQuesters,</span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span style="font-size:11pt;font-family:Calibri"> </span></font></p>
<p class="MsoNormal"><font face="Calibri" size="2"><span style="font-size:11pt;font-family:Calibri">I just got LEED review comments for my project. Our
proposed design is VRF system with roof top unit providing ventilation air.
Roof top unit is using gas as heating source. There are misc. elec. heaters in
the building for places like entries. I interpreted my building heating source
as “electric hybrid” and used hot water fossil fuel boiler as my
base design. The comments I got read as the follows:</span></font></p>
<p><i><font color="blue" face="Times New Roman" size="2"><span style="font-size:10pt;color:blue;font-style:italic">Section 1.1.A of the form indicates that
the primary heating source is fossil fuel. However, the electric heating energy
use reported in Table EAp2-5 for the Proposed Case exceeds the fossil fuel
heating energy use. Please verify that the correct heating source has been
selected. If electric heating is the primary heating source, please change the
Baseline system type accordingly. Provide updated simulation results and a
revised Prerequisite Form as necessary.</span></font></i></p>
<p><font face="Calibri" size="2"><span style="font-size:11pt;font-family:Calibri">I
couldn’t find an official definition either on LEED reference book or
90.1. What is your take on this?</span></font></p>
<p><font face="Calibri" size="2"><span style="font-size:11pt;font-family:Calibri">Your
input is highly appreciated! Thank you very much!</span></font></p>
<p><font face="Calibri" size="2"><span style="font-size:11pt;font-family:Calibri">Lan</span></font></p>
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<p class="MsoNormal"><b><font face="Clarendon Cd" size="2"><span style="font-size:10pt;font-family:"Clarendon Cd";font-weight:bold">Lan Li, PE, LEED AP BD+C</span></font></b></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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