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<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff
size=2>Dan:</FONT></SPAN></DIV>
<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff size=2>For
your simulation, I think you can model it as a typical boiler and cooling tower
system and then convert the heat rejection and heat addition loads of WLHP
loop to the required energy use of the hot and cold water if you know the
efficiency of the heat exchanger that isolates the WLHP loop from the hot/cold
water. It may be a bit more challenging if you want to couple the chilled water
system with the WLHP system. My initial thought is that you can create a dummy
zone that is cooled by the chilled water system and has the internal load
identical with the heat rejection load of the WLHP. You may have to run the
simulation twice and manually input the internal load to the dummy zone. Why
don't you use cooling tower to cool the WLHP water? Cooling tower should be
cheaper to run than the chiller.</FONT></SPAN></DIV>
<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff
size=2>Regarding eQUEST using PVVT to represent air-side of WLHP (water-to-air
heat pump), the reason is PVVT has more flexibility to model packaged DX coil
unit. By specifying stages of cooling and heating capacity, minimum airflow
ratio, and applying proper performance curves, PVVT can model either
conventional heat pump with single stage compressor and constant speed fan, or
more advanced heat pump with two-stage compressor and variable speed fan.
In addition, with PVVT, you can simulate a DOAS that heats and/or cools the OA
with a water-to-air heat pump after OA is preconditioned with
ERV.</FONT></SPAN></DIV>
<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff size=2>Hope
it helps,</FONT></SPAN></DIV>
<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=032305520-18092008><FONT face=Arial color=#0000ff
size=2>Xiaobing</FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org]<B>On Behalf Of </B>Dan
Russell<BR><B>Sent:</B> Tuesday, September 16, 2008 11:43 AM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [Bldg-sim] WLHP Loop with
Chilled Water and Geothermal Water Sources<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal>I have a building that is predominantly VAV with UFAD using
a boiler/chiller plant. However, one portion of the building is
residential which we would like to use WLHP’s for. I would like to use
purchased hot water (geothermal at 110 deg from City) and the chilled water
from the building plant to maintain the WLHP Loop between 60 and 90 deg.
<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Any ideas on how to model this?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Also, I’ve been a bit confused on how eQuest uses PVVT
systems to represent the air-side of WLHP systems. Any references or
resources anyone has that explains the theory behind this would be greatly
appreciated.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thanks, <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 14pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"> </SPAN><SPAN
style="FONT-SIZE: 18pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham">Dan Russell,
EIT <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><o:p> </o:p></SPAN></P>
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id=Picture_x0020_1 height=174 alt=cid:image001.jpg@01C840A4.E711B250
src="cid:032305520@18092008-1ebb" width=200></SPAN><o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></BLOCKQUOTE></BODY></HTML>