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<DIV><SPAN class=963502514-19092008><FONT face=Arial color=#0000ff
size=2>Doug:</FONT></SPAN></DIV>
<DIV><SPAN class=963502514-19092008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=963502514-19092008><FONT face=Arial color=#0000ff size=2>You
made a good point regarding the zoning of PVVT system. In fact, when simulate a
WLHP or GSHP system, eQUEST will assign PVVT system to each zone. So that, the
temperature and/or humidity of each zone can be individually controlled by the
assigned PVVT system. In addition, heat recovery between zones with simultaneous
heating an cooling needs can be accounted for in the WLHP/GSHP loop temperature
calculation.</FONT></SPAN></DIV>
<DIV><SPAN class=963502514-19092008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=963502514-19092008><FONT face=Arial color=#0000ff size=2>In the
Design Development wizard of eQUEST, user can select zoning method for PVVT from
the four options: System per Zone; System per Floor; System per Shell; and
System per Site. However, it is recommended to use "System per Zone" for
simulating WLHP or GSHP system (which uses multiple water-to-air heat pumps to
independently cool/heat each individual zone and recover heat among zones when
simultaneous heating and cooling occurs among the conditioned zones). Using
other zoning method, may result in under cooled/under heated hours due to the
reason explained by Doug in his following message.</FONT></SPAN></DIV>
<DIV><SPAN class=963502514-19092008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=963502514-19092008><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> Doug Maddox
[mailto:DougM@TWGI.com]<BR><B>Sent:</B> Thursday, September 18, 2008 8:52
PM<BR><B>To:</B> Xiaobing Liu; Dan Russell;
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> RE: [Bldg-sim] WLHP Loop
with Chilled Water and Geothermal WaterSources<BR><BR></FONT></DIV>
<DIV class=Section1>
<DIV>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">My
understanding is that if you assign multiple zones to a PVVT, it is modeled as
a single central water-cooled DX cooling/heating coil serving multiple
zones. One zone is designated as the control zone and the central coil
is controlled based on its thermostat. </SPAN></FONT><FONT face=Arial
size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">According to the DOE2.2 help
file: <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">“</SPAN></FONT>The airflow to all
other zones is proportionate to the airflow of the control zone. In other
words, the thermostats in the non-control zones have no effect on either
airflow or supply air temperature. They may, however, modulate a reheat
coil or baseboard.” <o:p></o:p></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt">Thus, there may be times where there is simultaneous
cooling and heating for some zones. The only way to have one compressor per
zone is to assign each zone to its own SYSTEM.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">For
the HP system type, when multiple zones are assigned to a single SYSTEM, each
zone is modeled as having its own compressor and DX heating/cooling
coil. This eliminates simultaneous heating and cooling.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">This is all based on my review of
the DOE2.2 help file. If anyone has a different experience, I would
appreciate hearing about it.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Thanks,<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Doug
Maddox<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">The Weidt
Group<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P></DIV>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Xiaobing Liu<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thursday, September 18, 2008 5:23
PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Dan Russell;
bldg-sim@lists.onebuilding.org<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [Bldg-sim] WLHP Loop with
Chilled Water and Geothermal WaterSources</SPAN></FONT><FONT
face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Dan:</SPAN></FONT><FONT
face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">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.</SPAN></FONT><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">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.</SPAN></FONT><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Hope it
helps,</SPAN></FONT><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Xiaobing</SPAN></FONT><FONT
face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P></DIV>
<BLOCKQUOTE style="MARGIN-TOP: 5pt; MARGIN-BOTTOM: 5pt; MARGIN-RIGHT: 0in">
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face=Tahoma
size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">-----Original
Message-----<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org]<B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Dan Russell<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Tuesday, September 16, 2008 11:43
AM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
bldg-sim@lists.onebuilding.org<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Bldg-sim] WLHP Loop with
Chilled Water and Geothermal Water Sources</SPAN></FONT><FONT
face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN style="FONT-SIZE: 11pt">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></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt">Any ideas on how to model
this?<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt">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></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt">Thanks, <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Cheltenham color=#a0002f size=4><SPAN
style="FONT-SIZE: 14pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"> </SPAN></FONT><FONT
face=Cheltenham color=#a0002f size=5><SPAN
style="FONT-SIZE: 18pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham">Dan
Russell, EIT <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Cheltenham color=#a0002f size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Cheltenham color=#a0002f size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: #a0002f; FONT-FAMILY: Cheltenham"><IMG
id=Picture_x005f_x0020_1 height=174 alt=cid:image001.jpg@01C840A4.E711B250
src="cid:963502514@19092008-18d9" width=200></SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face=Calibri size=2><SPAN
style="FONT-SIZE: 11pt"><o:p> </o:p></SPAN></FONT></P></BLOCKQUOTE></DIV></BLOCKQUOTE></BODY></HTML>