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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Steven, Dana,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You could also consider using the Heat
Pump chiller type (instead of <st1:place w:st="on">Loop-to-Loop</st1:place>),
attached to a two-pipe loop. From the description, it sounds like each
stage/compressor of the <span class=SpellE>Multistack</span> unit supplies
either HW or CHW to a two-pipe loop. You still have to use the Lake/Well loop
type to represent the vertical bore field, but you avoid creating separate HW
and CHW loops and duplicating the pumps, and you deal more realistically with
the limitations of a two-pipe loop.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Regards,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Bill<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><b
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"Franklin Gothic Medium Cond";color:black;font-weight:bold;mso-bidi-font-weight:
normal;mso-no-proof:yes'>William</span></font></b></st1:City><b
style='mso-bidi-font-weight:normal'><font size=2 color=black
face="Franklin Gothic Medium Cond"><span style='font-size:10.0pt;font-family:
"Franklin Gothic Medium Cond";color:black;font-weight:bold;mso-bidi-font-weight:
normal;mso-no-proof:yes'> <st1:State w:st="on">Bishop</st1:State>, <st1:State
w:st="on">PE</st1:State></span></font></b></st1:place><b style='mso-bidi-font-weight:
normal'><font size=2 color=black face="Franklin Gothic Medium Cond"><span
style='font-size:10.0pt;font-family:"Franklin Gothic Medium Cond";color:black;
font-weight:bold;mso-bidi-font-weight:normal;mso-no-proof:yes'>, BEMP, LEED<sup>®</sup>
AP </span></font></b><b style='mso-bidi-font-weight:normal'><font size=2
color="#006600" face="Franklin Gothic Medium Cond"><span style='font-size:10.0pt;
font-family:"Franklin Gothic Medium Cond";color:#006600;font-weight:bold;
mso-bidi-font-weight:normal;mso-no-proof:yes'>|</span></font></b><b
style='mso-bidi-font-weight:normal'><font size=2 color=black
face="Franklin Gothic Medium Cond"><span style='font-size:10.0pt;font-family:
"Franklin Gothic Medium Cond";color:black;font-weight:bold;mso-bidi-font-weight:
normal;mso-no-proof:yes'> </span></font></b><b style='mso-bidi-font-weight:
normal'><font size=2 color=black face="Franklin Gothic Medium Cond"><span
style='font-size:10.0pt;mso-bidi-font-size:11.0pt;font-family:"Franklin Gothic Medium Cond";
color:black;font-weight:bold;mso-bidi-font-weight:normal;mso-no-proof:yes'>Pathfinder
Engineers & Architects LLP</span></font></b><b><font size=2 color=black
face="Franklin Gothic Medium Cond"><span style='font-size:10.0pt;font-family:
"Franklin Gothic Medium Cond";color:black;font-weight:bold;mso-no-proof:yes'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:black;mso-no-proof:yes'>Mechanical Engineer<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
5.0pt;font-family:Arial;color:black;mso-no-proof:yes'><o:p> </o:p></span></font></p>
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w:st="on"><font size=1 color=navy face=Arial><span style='font-size:9.0pt;
font-family:Arial;color:navy;mso-no-proof:yes'>134 South Fitzhugh Street</span></font></st1:Street><font
size=1 color=navy><span style='font-size:9.0pt;color:navy;mso-no-proof:yes'><span
style='mso-tab-count:2'> </span></span></font><st1:City
w:st="on"><font size=1 color=navy face=Arial><span style='font-size:9.0pt;
font-family:Arial;color:navy;mso-no-proof:yes'>Rochester</span></font></st1:City><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy;mso-no-proof:yes'>, <st1:State w:st="on">NY</st1:State> <st1:PostalCode
w:st="on">14608</st1:PostalCode></span></font><font size=1 color=navy><span
style='font-size:9.0pt;color:navy;mso-no-proof:yes'><br>
</span></font><font size=1 color=navy face=Arial><span style='font-size:9.0pt;
font-family:Arial;color:navy;mso-no-proof:yes'>T: (585) 325-6004 </span></font><font
size=1 color=black face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:black;mso-no-proof:yes'>Ext. 114</span></font><font color=navy><span
style='color:navy;mso-no-proof:yes'><span style='mso-tab-count:1'> </span></span></font><font
size=1 color=navy face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:navy;mso-no-proof:yes'>F: (585) 325-6005</span></font><font size=1
color=black face=Arial><span style='font-size:9.0pt;mso-bidi-font-size:12.0pt;
font-family:Arial;color:black;mso-no-proof:yes'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:black;mso-no-proof:yes'><a
href="mailto:wbishop@pathfinder-ea.com">wbishop@pathfinder-ea.com</a><span
style='mso-tab-count:1'> </span></span></font><font
size=1 color=black face=Arial><span style='font-size:9.0pt;mso-bidi-font-size:
11.0pt;font-family:Arial;color:black;mso-no-proof:yes'><a
href="http://www.pathfinder-ea.com/">www.pathfinder-ea.com</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=5 color=green face=Webdings><span
style='font-size:18.0pt;font-family:Webdings;mso-bidi-font-family:Webdings;
color:green;mso-no-proof:yes'>P</span></font><font color=green><span
style='color:green;mso-no-proof:yes'><span
style='mso-spacerun:yes'> </span></span></font><font size=1
color=green><span style='font-size:7.5pt;color:green;mso-no-proof:yes'>Sustainability
– the forest AND the trees.</span></font><font size=5 color=green
face=Webdings><span style='font-size:18.0pt;font-family:Webdings;mso-bidi-font-family:
Webdings;color:green;mso-no-proof:yes'> P<span style='mso-tab-count:1'> </span></span></font><font
size=3 color=green face="Times New Roman"><span style='font-size:12.0pt;
mso-bidi-font-size:11.0pt;font-family:"Times New Roman";color:green'><o:p></o:p></span></font></p>
</div>
<div>
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</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Dana Troy<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 08, 2011
1:08 PM<br>
<b><span style='font-weight:bold'>To:</span></b>
ssavich@systemswestengineers.com<br>
<b><span style='font-weight:bold'>Cc:</span></b>
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users]
Modeling Multstack Units in eQUEST</span></font><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>Steven,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>We successfully developed a methodology
for simulating ground-coupled Multistack heat pumps in eQUEST. I have included
below portions of our SEED Report (<st1:State w:st="on"><st1:place w:st="on">Oregon</st1:place></st1:State>’s
stated required program for publicly funded buildings). A lot of the text is
specific to the project we were working on, but the general idea is there.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>The project ended up pursuing a standard
chilled/heating water arrangement for the final design, so the Multistack heat
pump was not installed.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>I hope this information helps.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>Regards,<br>
Dana<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Heating
and cooling will be provided by hot and chilled water, respectively, from a
ground-coupled heat pump Multistack unit and will be connected to a condenser
water vertical bore field. A Multistack unit is essentially a unit that
contains a number of heat pump modules linked together in parallel. Depending
on the load, each module can provide either heating water <i><span
style='font-style:italic'>or</span></i> chilled water. The condenser water loop
is then connected to a vertical bore field onsite, where 200 ft deep bores
located 20 feet on center is anticipated. The Multistack on this project
utilizes seven modules. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>As
eQUEST cannot directly model a Multistack unit, an alternate approach had to be
taken in order to approximate the operation of the equipment. In summary, the
Multistack was modeled in eQUEST by simulating each module of the Multistack as
an individual chiller for heating and cooling. A general diagram on how the
system is modeled in eQUEST can be seen in Figure 8 on the following page while
more detailed explanations can be seen on the following pages.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><img border=0 width=644 height=774
id="_x0000_i1030" src="cid:image002.jpg@01CBC79B.524D7F60"
alt="Mutlistack Diagram"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'>Figure: How the Multistack was simulated
in eQUEST<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=Subheader><b><font size=2 face="Arial Narrow"><span style='font-size:
11.0pt'>Chilled water<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>The
chillers have a total flow of approximately 640 gpm and provide 45-degree
chilled water with a 57-degree return water temperature. Connected to the
chilled water loop are two pumps, in parallel that provide the 640 gpm flow.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Each
chiller module is modeled as an electric hermetic centrifugal chiller with a
capacity of 70 tons. Each stage is scheduled remain off until the stage before
has been loaded to 100% and has an EER of 23 (EIR of 0.1483).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Default
capacity curves were used for the preliminary analysis, however, customizes
curves will be used once the information becomes available. A screenshot of the
eQUEST layout in the Water-Side HVAC tab can be seen below in Figure 9.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><img border=0 width=645 height=447
id="Picture_x005f_x0020_2" src="cid:image003.jpg@01CBC79B.524D7F60"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=Subheader><b><font size=2 face="Arial Narrow"><span style='font-size:
11.0pt'>Heating water<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Since
there is no heat pump boiler, an alternative method had to be developed to
simulate the production of hot water. The heat pump chiller (LOOP-TO-LOOP-HP)
in eQUEST is a heat pump that provides heating and chilled water
simultaneously, with the larger load rejecting heat to the smaller load. This
system could not be used for both the heating and cooling of the Multistack
unit because it internal heat recovery when the dominant load rejects or adds
heat to the small load. The Multistack has multiple smaller modules that
operate in either cooling or heating only, and therefore do not provide
integral heat recovery. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Since
the LOOP-TO-LOOP-HP needs to be connected to a chilled water loop to work
properly in eQUEST, the chillers had to be connected to a "dummy"
chilled water loop. In order to avoid a "loop has zero flow" error,
the loop had a minimal process chilled water flow that reset down to zero after
the first hour of the year. The chillers were then connected to the hot water
loop that serves the building. Since the hot water demand will always be higher
than the dummy process chilled water flow the chillers will be driven by the
hot water loop. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>The
chillers have a flow of 715 gpm and provide 110-degree hot water with a
90-degree return water temperature. Connected to the hot water loop are two
pumps, in parallel, that provide the 715 gpm flow.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>In
eQUEST, it is required that secondary hot water pumps and chilled water pumps
be connected to each heat pump chiller. Since the design is a variable primary
flow and the chilled water is a dummy load, the secondary hot water pump power
and the dummy chilled water pump power was zeroed out. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>eQUEST
also does not allow the heat pump chiller to be connected to any condenser
water loop except the type "LAKE/WELL". In order to keep the ground
coupled performance level, both the chilled water and heating water chillers
connected to lake/well loops. Details of the condenser water loop can be seen
in the next section. A screenshot of the eQUEST layout in the Water-Side HVAC
tab can be seen below in Figure 9.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Also
included in the design is a hot water condensing boiler to provide additional
heating capacity during extreme peaking cooling. Since eQUEST uses TMY2 weather
data that generally uses hourly averages, extreme cold days are never modeled,
and therefore the boiler never turns on.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><img border=0 width=645 height=507
id="_x0000_i1028" src="cid:image004.jpg@01CBC79B.524D7F60"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=Subheader><b><font size=2 face="Arial Narrow"><span style='font-size:
11.0pt'>Condenser water<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Due
to modeling limitations of the heat pump chiller, each condenser water loop was
modeled as a LAKE/WELL loop. Each heating and cooling module was given its own
loop to track and verify performance in the hourly reports. Each loop was
scheduled to supply 55-degree condenser water back to the chillers, as
scheduled in drawings. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>The
design consists of two condenser water loops connected in parallel. In the
model, the two pumps were divided up amongst the chillers, with each pump set
to single speed. Since each pump would only turn on when the chiller it was
attached to was operating, it would loosely represent a variable speed drive
pump with multiple stages. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><b><font size=2 color="#1f497d" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#1F497D;font-weight:bold'>Dana
Troy</span></font></b><font size=3 color="#1f497d" face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman";color:#1F497D'><br>
</span></font><font size=2 color="#1f497d" face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:#1F497D'>Senior Energy Analyst</span></font><font
size=3 color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman";color:#1F497D'><br>
</span></font><font size=2 color="#1f497d" face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:#1F497D'>LEED AP<sup>®</sup></span></font><font
size=3 color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman";color:#1F497D'> <br>
<br>
</span></font><a href="http://www.glumac.com/"><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman";
text-decoration:none;text-underline:none'><img border=0 width=339 height=37
id="Picture_x005f_x0020_1" src="cid:image005.jpg@01CBC79B.524D7F60"
alt="http://www.glumac.com/glumacsig.gif"></span></font></a><font size=3
color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman";color:#1F497D'><o:p></o:p></span></font></p>
<div>
<div>
<div>
<div>
<div>
<div class=MsoNormal><font size=3 color="#1f497d" face="Times New Roman"><span
style='font-size:12.0pt;font-family:"Times New Roman";color:#1F497D'>
<hr size=2 width=330 style='width:247.5pt' noshade color="#9acb33" align=left>
</span></font></div>
</div>
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</div>
<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:#1F497D'>320 SW Washington, <st1:address
w:st="on"><st1:Street w:st="on">Suite</st1:Street> 200</st1:address></span></font><font
size=3 color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman";color:#1F497D'><br>
</span></font><st1:place w:st="on"><st1:City w:st="on"><font size=1
color="#1f497d" face=Arial><span style='font-size:9.0pt;font-family:Arial;
color:#1F497D'>Portland</span></font></st1:City><font size=1 color="#1f497d"
face=Arial><span style='font-size:9.0pt;font-family:Arial;color:#1F497D'>, <st1:State
w:st="on">OR</st1:State> <st1:PostalCode w:st="on">97204-2640</st1:PostalCode></span></font></st1:place><font
size=3 color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman";color:#1F497D'><br>
</span></font><font size=1 color="#1f497d" face=Arial><span style='font-size:
9.0pt;font-family:Arial;color:#1F497D'>T. 503.227.5280 F.
503.274.7674<br>
<br>
</span></font><b><font size=2 color="#333333" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333333;font-weight:bold'>Thinking.
Inside the building.</span></font></b><font size=1 color="#1f497d" face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:#1F497D'><br>
</span></font><font size=2 color="#333333" face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:#333333'><a href="http://www.glumac.com/">www.glumac.com</a></span></font><font
size=3 color="#1f497d" face="Times New Roman"><span style='font-size:12.0pt;
font-family:"Times New Roman";color:#1F497D'> <br>
<img border=0 width=309 height=23 id="Picture_x005f_x0020_3"
src="cid:image006.gif@01CBC79B.524D7F60"
alt="http://www.glumac.com/consider.gif"></span></font><font color="#1f497d"><span
style='color:#1F497D'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Steven Savich
[mailto:ssavich@systemswestengineers.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, February 08, 2011
9:57 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Dana Troy<br>
<b><span style='font-weight:bold'>Cc:</span></b> equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users]
Modeling Multstack Units in eQUEST<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'>Dana,<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>What solution did you end up using to model the Multistack heat pump chiller coupled to a vertical bore field in eQuest?<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Any pointers would be greatly appreciated.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Thanks,<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Steven<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:11.0pt;font-family:"Bookman Old Style"'>Steven Savich, LEED AP</span></font><font
size=3 face="Times New Roman"><span style='font-size:12.0pt;font-family:"Times New Roman"'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>Systems West Engineers</span></font><o:p></o:p></p>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=2
face="Bookman Old Style"><span style='font-size:10.0pt;font-family:"Bookman Old Style"'>411
High Street</span></font></st1:address></st1:Street><o:p></o:p></p>
<p class=MsoNormal><st1:place w:st="on"><st1:City w:st="on"><font size=2
face="Bookman Old Style"><span style='font-size:10.0pt;font-family:"Bookman Old Style"'>Eugene</span></font></st1:City><font
size=2 face="Bookman Old Style"><span style='font-size:10.0pt;font-family:
"Bookman Old Style"'>, <st1:State w:st="on">OR</st1:State> <st1:PostalCode
w:st="on">97401-2427</st1:PostalCode></span></font></st1:place><o:p></o:p></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>(541) 342-7210</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face="Bookman Old Style"><span
style='font-size:10.0pt;font-family:"Bookman Old Style"'>(541) 342-7220 (fax)</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p>
<pre><font size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Has anyone had any luck modeling a Multistack<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>(<a
href="http://www.multistack.com/">http://www.multistack.com/</a>) unit in eQUEST?<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>We have a project that uses a Multistack unit to provide hot and chilled<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>water to a project and is coupled to a vertical bore field. eQUEST does<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>not have the capability to model system directly, so I have been trying<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>to look into other methods, all which are falling short. So far I have<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>tried:<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>* Using the "<st1:place
w:st="on">Loop-to-Loop</st1:place> Heat Pump" chiller; however, this<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>system does not work like the Multistack, as the Multistack does not<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>have internal heat exchange, has multiple compressor stages which are<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>all piped in parallel with the condenser water, and can only be<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>connected to a Lake/Well loop.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>* Using a separate chilled water loop and hot water loop, each<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>of which are connected to a WLHP loop with a vertical bore HX. This<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>would be perfect, as I can put as many chillers and boilers on the loops<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>as there are stages in the Multistack; however, eQUEST does not have a<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>heat-pump boiler, so the boiler cannot be connected to the vertical bore<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>field.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>* Using a dummy space/zone/system connected to a dummy heat<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>recovery chiller. The chiller would then reject heat to the hot water<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>loop that supplies the rest of the building. This would work, however<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>the chiller demand is driven by the cooling load of the dummy system and<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>it is impossible to create a dummy cooling load that would exactly match<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>the heating load required by the hot water loop.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>* And finally, using a domestic hot water loop because the<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>boiler type can be set to "heat pump", however, the heat cannot be<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>rejected to a condenser water loop.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>So I guess the question I am asking is has anyone either successfully<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>modeled the Multistack unit OR modeled a heat pump boiler?<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Thanks in advance.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>-Dana<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Dana Troy<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Energy Analyst<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>LEED(r) Accredited Professional<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'> <<a
href="http://www.glumac.com/">http://www.glumac.com/</a>> <o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>________________________________<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>320 SW Washington, <st1:address
w:st="on"><st1:Street w:st="on">Suite</st1:Street> 200</st1:address><o:p></o:p></span></font></pre><pre><st1:place
w:st="on"><st1:City w:st="on"><font size=2 face="Courier New"><span
style='font-size:10.0pt'>Portland</span></font></st1:City>, <st1:State w:st="on">OR</st1:State> <st1:PostalCode
w:st="on">97204-2640</st1:PostalCode></st1:place><o:p></o:p></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>T. 503.227.5280 F. 503.274.7674<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'><o:p> </o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>Thinking. Inside the building.<o:p></o:p></span></font></pre><pre><font
size=2 face="Courier New"><span style='font-size:10.0pt'>www.glumac.com <<a
href="http://www.glumac.com/">http://www.glumac.com/</a>> </span></font><font
size=2 face=Calibri><span style='font-size:11.0pt;font-family:Calibri'><o:p></o:p></span></font></pre></div>
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