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<DIV><SPAN class=149124914-22082007><FONT face=Arial size=2>Hello
all,</FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial color=#0000ff size=2><FONT
color=#000000>We have recently performed an analysis on</FONT> <FONT
color=#000000>a building that is potentially going to incorporate the City Multi
system. After many hours of going through eQUEST, I devised a method of modeling
it that I would like to run past you all for any thoughts/ideas.
</FONT></FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial color=#0000ff size=2><FONT
color=#000000></FONT></FONT></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial color=#0000ff size=2><FONT
color=#000000>First, for those not aware of the problems, here is a
<STRONG>background of the systems</STRONG>:</FONT></FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial size=2>The City Multi
system consists of essentially three parts: the condenser, the BC controller,
and the heat exchanger unit at each zone. Refrigerant is the only property used
for heat exchange, i.e. there is no water running from the condenser to the
controller to the zone units. Each zone unit is essentially a fan coil, in that
there is no compressor work at the zone, only fan energy. The BC controller is
essentially a heat exchanger which gives the City Multi system a large advantage
by being able to transfer heat, say from the south face of a building, to the
north face, which is in the shade. All of the individual zone units connect to
the BC controller and the BC controller distributes the refrigerant accordingly.
If there is not enough free energy being generated by the system, the compressor
kicks in and supplies or rejects heat from the loop to meet the demand.
</FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial size=2>To model this in
eQUEST, which has been suggested before, the water source heat pump system
should be selected in order to account for the free transfer of heat from zone
to zone. There are, however, several problems with this. One is that pumping
energy is required to pump the water throughout the building. The second problem
is that at each zone, each heat pump runs a compression cycle in order to supply
or reject heat to or from the zone to the water loop. The third is that a boiler
and cooling tower take the place for the condenser in the City Multi system.
Each system requires a make-up air unit which can be modeled the same in each
simulation.</FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial size=2><STRONG>Now here is
what I would like you all to review</STRONG>: </FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007></SPAN><SPAN class=149124914-22082007><FONT
face=Arial size=2>These are some of the steps I went to in order to make the
water source heat pump as much like the City Multi as
possible.</FONT></SPAN></DIV>
<UL>
<LI><SPAN class=149124914-22082007><FONT face=Arial size=2>Made the boiler and
electric boiler (to simulate the electric compressor) and gave it the
appropriate heating EIR that was specified in the Citi Multi specification
manual. <SPAN class=149124914-22082007><FONT face=Arial size=2>I gave the fan
the same EIR as the cooling side of the compressor in the same
manual.</FONT></SPAN></FONT></SPAN>
<LI><SPAN class=149124914-22082007><FONT face=Arial size=2>I made a
spreadsheet to subtract out the pumping energy (only from the water loop! Not
the DHW loop!) to simulate the suction of the refrigerant through the building
in the City Multi system. I had to do this in the BEPS and the BEPU report
which made it kind of a hassle to find the energy cost savings.</FONT></SPAN>
<LI><SPAN class=149124914-22082007><FONT face=Arial size=2>For each heat pump,
I set the EIR equal to 0.0001 to simulate the fan coil in the City Multi
system. Therefore, whatever heat is transferred to or from the water loop is
only shown with the fan energy from blowing the air over the coils. IF this is
not a proper way to do it, then what should the EIR be? It cannot be the EIR
from the condenser, because that has nothing to do with the free heat transfer
energy at the zones. </FONT></SPAN></LI></UL>
<DIV><SPAN class=149124914-22082007><FONT face=Arial size=2>What do you guys
think about this approach? I figure that since this is a tough problem that
other people have encountered as well, I might as well use this huge resource
that has many great minds to come to a solution. </FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial size=2>Please, any feedback
would be greatly appreciated. </FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007></SPAN> </DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial size=2>Regards,<FONT
face=Arial size=2></FONT><FONT face=Arial size=2></FONT><FONT face=Arial
size=2></FONT>
<DIV><BR><STRONG><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Dana
Troy</SPAN></STRONG></DIV>
<DIV><STRONG><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN></STRONG><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"></SPAN><FONT face=Arial
size=2>Energy Analyst </FONT><BR><BR><A href="http://www.glumac.com/"><IMG
src="http://www.glumac.com/glumacsig.gif" border=0></A> </DIV>
<DIV>
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SIZE=2>
</DIV>
<DIV></DIV>
<DIV><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">320 SW
Washington, Suite 200</SPAN><BR><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">Portland,
OR 97204-2640</SPAN><BR><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">T.
503.227.5280<SPAN style="mso-spacerun: yes"> </SPAN>F.
503.274.7674</SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 9pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">D.
503.345.6286<BR><BR><STRONG><SPAN
style="FONT-SIZE: 10pt; COLOR: #333333; FONT-FAMILY: Arial">Thinking. Inside the
building.</SPAN></STRONG><BR><STRONG><SPAN
style="FONT-WEIGHT: normal; FONT-SIZE: 10pt; COLOR: #333333; FONT-FAMILY: Arial"><A
href="http://www.glumac.com/">www.glumac.com</A></SPAN></STRONG></SPAN>
</DIV></FONT></SPAN></DIV>
<DIV><SPAN class=149124914-22082007><FONT face=Arial
size=2></FONT></SPAN> </DIV><PRE>
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