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<p class=MsoNormal><span style='color:#1F497D'>I have a similar scenario although
mine is on the heating side. In my case the proposed building is using
purchased heat via a low-temp geothermal water source that can be purchased
from the local District. The baseline is required by App G to be VAV w/
reheat using design supply hot water temp = 180 deg F. The geothermal
source is 110 deg, so it can’t be used in the baseline scheme with
standard hot water heating coils. This situation is different than Andy’s
in that using the geothermal source results in a tremendous cost savings to the
owner. The proposed system will use Water-Water Heat Pumps to take about
a 65 degree temperature drop out of the 110 deg source. The cost of the
source is based on gallons usage, with no regard for heat transfer. The
rate schedule is set to be equivalent to the cost of natural gas assuming a 20
deg temperature drop. So in essence, every degree the system can take out
past 20 deg is free heating energy, which I’m hoping the modeling
protocol allows credit for.<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'>So, I am interested if there is
any insight out there on what to do when the baseline and proposed systems
utilize separate utilities.<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'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Cheltenham","serif";
color:#A0002F'> </span><span style='font-size:18.0pt;font-family:"Cheltenham","serif";
color:#A0002F'>Dan Russell, EIT <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Cheltenham","serif";
color:#A0002F'><o:p> </o:p></span></p>
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color:#A0002F'><img width=200 height=174 id="Picture_x0020_1"
src="cid:image001.jpg@01C92AB0.A5F61B70"
alt="cid:image001.jpg@01C840A4.E711B250"></span><span style='color:#1F497D'><o:p></o:p></span></p>
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Andy Stone<br>
<b>Sent:</b> Friday, October 10, 2008 4:49 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] ASHRAE 90.1-2004 Purchased Chilled Water<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span lang=EN-GB>Hi all,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>I'm doing a LEED EAc1/ASHRAE 90.1-2004
Appendix G calculation where the building is served by a district cooling
scheme and the basecase building is serviced by PTHP (ASHRAE 90.1 table
G3.1.1A), i.e. the basecase building is uses electrically powered DX coils
compared to purchased chilled water coils for the proposed building. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>The problem I have is that the price per
kWh of chilled water is very close to the local price per kWh of electricity,
which means that the cooling energy cost of the proposed building ends up much
larger - for the PTHP system 1kWh of electricity gives something like 3kWh of
cooling, but the same money only gets 1kWh of cooling from the district scheme,
which makes it virtually impossible to get any LEED EAc1 credits. Has
anyone else encountered this issue?<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Thanks for your help,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-GB><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-GB>Andy<o:p></o:p></span></p>
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