Thanks for all the comments. This is for LEED EA Credit 1. The system has no fossil fuel supplementation, so PSZ-HP it is. The poor baseline benefits the project in terms of LEED points, however, this leads to something I've been thinking...<br>
<br>Why not use the same baseline for all buildings? Or at least make baseline system selection appropriate for different climate zones. This baseline would make choosing electric resistance heat look somewhat reasonable in this climate. Use of electric resistance heat is actually no longer legal in the state of Vermont for commercial construction.<br>
<br>~Karen~<br><br><div class="gmail_quote">On Mon, Mar 17, 2008 at 2:32 PM, Keith Swartz <<a href="mailto:kswartz@ecw.org">kswartz@ecw.org</a>> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Karen,</span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">I agree with your interpretation -- the
system would be 4-PSZ-HP – assuming you are using the 2004 edition of
ASHARE 90.1. The User's Manual states that if the heating energy source
for the proposed building is electricity, then the heating energy source for
the baseline building has to be electricity too. This system would not actually
be used in Wisconsin
either. Fortunately for me, the utility programs that I model for allow me to
use "engineering judgment" (common sense), so I can use a realistic
system for the baseline. But if you have to go by the book, then 4-PSZ-HP it
is! I can see how this could overstate the savings for a ground-source heat
pump system in a cold climate like ours.</span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
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<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Sincerely,</span></font></p>
<p><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">Keith Swartz</span></font><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial; color: navy;">, PE, LEED® AP</span></font></p>
<p><font face="Arial" size="2"><span style="font-size: 10pt; font-family: Arial;"><font color="navy"><span style="color: navy;">Energy</span></font><font color="navy"><span style="color: navy;"> </span></font><font color="navy"><span style="color: navy;">Center</span></font><font color="navy"><span style="color: navy;"> of </span></font><font color="navy"><span style="color: navy;">Wisconsin</span></font><font color="navy"><span style="color: navy;"></span></font></span></font></p>
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<p><b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma;"> Karen Walkerman
[mailto:<a href="mailto:kwalkerman@gmail.com" target="_blank">kwalkerman@gmail.com</a>] <br>
<b><span style="font-weight: bold;">Sent:</span></b> Friday, March 14, 2008 12:36
PM<br>
<b><span style="font-weight: bold;">To:</span></b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> [Bldg-sim] LEED system
selection for GSHP</span></font></p>
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<p><font face="Times New Roman" size="3"><span style="font-size: 12pt;"> </span></font></p>
<p><font face="Times New Roman" size="3"><span style="font-size: 12pt;">Hello friends,<br>
<br>
Anyone know what the BASELINE system should be if the design system is a ground
source heat pump? I have a non-residential building, 3 floors and <
75,000 square feet. The design system type is groundsource heat pump,
which leads to system 4-PSZ-HP, which nobody would ever choose for this climate
(Burlington, VT).<br>
<br>
Any thoughts?<br>
<br>
~Karen~</span></font></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Karen Walkerman<br>Second Law Consulting<br>802-238-0980<br><a href="mailto:kwalkerman@gmail.com">kwalkerman@gmail.com</a>