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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>That warning is stating that you don¡¯t have any control
scheme set up to manage the water temperature in the chilled water loop.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>You¡¯ll have to use a SetpointManager:Scheduled (or some
other setpoint manager if you don¡¯t have a single setpoint control). You¡¯ll
need to reference which node you are referring to, but it should be either
Plant Side Outlet Node (which sets the temperature of the mixed water leaving
the chillers and chiller bypass) or the Demand Side Inlet (which sets the
temperature of the water entering the coils). I usually do the Plant Side
Outlet Node. You can check what the name of that node is in the PlantLoop
object for the chilled water system; it will be the node name for the Plant
Side Outlet Node Name parameter. (In that example file I referenced, the
setpoint node was Chilled Water Loop ChW Pri Supply Outlet)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>In the SetpointManager:Scheduled object you will need to
reference a schedule. If you have a fixed temperature setpoint, the
easiest schedule to use is the Schedule:Constant. Remember that the value
should be in degrees Celsius.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hopefully that helps.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><strong><b><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Elyse Malherek</span></font></b></strong><font
color=navy><span style='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'>Applications Engineer</span></font><font
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<p class=MsoNormal><em><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>a member of DAIKIN group</span></font></i></em><font
color=navy><span style='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'>763.553.5379 (Office)</span></font><font
color=navy><span style='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'><a href="mailto:elyse.malherek@mcquay.com">elyse.malherek@mcquay.com</a></span></font><o:p></o:p></p>
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<hr size=2 width="100%" align=center tabindex=-1>
</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'> </span></font><font
size=2><span lang=ZH-CN style='font-size:10.0pt'>º«ÐÇ</span></font><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
[mailto:foolishstar@163.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, October 26, 2011
4:14 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Malherek, Elyse<br>
<b><span style='font-weight:bold'>Cc:</span></b> Jean marais; bldg<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re:RE: [Bldg-sim]
Secondary variable pump modeling</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face=SimSun><span style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'>Dear Malherek,<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'>Thank you for your advice! It really
helped me!<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'>But I still have some questions.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'>When I use the common pile in the
"Plant Loop", the simulation could run. But when I tried to use the
"Two-way common pile" as you indicated, errors occur as follows.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
</div>
<div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'> ** Severe ** While
using a two way common pipe there must be a set point in addition to the Plant
Supply Outlet node.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'> ** ~~~ **
Currently neither plant demand inlet nor plant supply inlet have setpoints.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'> ** ~~~ **
Select one of the two nodes and rerun the simulation.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'> ** ~~~ **
Occurs for: PlantLoop=CHW LOOP<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
</div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'>Can you please give me a hint?<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'><o:p> </o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'>Thanks!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=black face=Arial><span style='font-size:
9.5pt;font-family:Arial;color:black'><br>
At 2011-10-25 22:50:54,"Malherek, Elyse" <<a
href="mailto:elyse.malherek@mcquay.com">elyse.malherek@mcquay.com</a>>
wrote:<br>
<br>
<o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'>You can look at the EnergyPlus example file called
5ZoneVAV-Pri-SecLoop.idf as a guide for creating a primary-secondary chilled water
flow configuration in EnergyPlus.<u1:p></u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><u1:p> </u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'>Basically, you just have to have two pumps in the chilled water
plant loop: a Pump:VariableSpeed object to represent the secondary loop and a
Pump:ConstantSpeed object to represent the primary loop. And then in the
chilled water PlantLoop object, change the Common Pipe Simulation parameter
from blank to ¡°TwoWayCommonPipe¡±<u1:p></u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><u1:p> </u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'>You may want to run the example file and look at the .svg output
file to see how the plant is arranged and how the node names should match between
the various EnergyPlus objects.<u1:p></u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'><u1:p> </u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:11.0pt;font-family:Arial;
color:black'>Use the EngineeringReference document (from the help menu) and
search the document for Primary-Secondary to find the section that explains how
primary-secondary loops are implemented and controlled in EnergyPlus.<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><u1:p> </u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><strong><b><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Elyse Malherek</span></font></b></strong><font color=black><span
style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>Applications Engineer</span></font><font color=black><span
style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>McQuay International</span></font><font color=black><span
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<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><em><i><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>a member of DAIKIN group</span></font></i></em><font color=black><span
style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>763.553.5379 (Office)</span></font><font color=black><span
style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'><a href="mailto:elyse.malherek@mcquay.com">elyse.malherek@mcquay.com</a></span></font><font
color=black><span style='color:black'><u1:p></u1:p><o:p></o:p></span></font></p>
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<div class=MsoNormal align=center style='text-align:center'><font size=3
color=black face=SimSun><span style='font-size:12.0pt;color:black'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><font
size=2 color=black face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;
color:black;font-weight:bold'>From:</span></font></b><font size=2 color=black
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma;color:black'> <a
href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org">bldg-sim-bounces@lists.onebuilding.org</a>]
<b><span style='font-weight:bold'>On Behalf Of </span></b>??<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, October 25, 2011
1:18 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'bldg'<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] Secondary
variable pump modeling</span></font><u1:p></u1:p><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 color=black face=SimSun><span style='font-size:12.0pt;color:black'><u1:p> </u1:p><o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:9.5pt;font-family:Arial;
color:black'>in the modeling of pump systems, according to 90.1, it should be
primary/secondary systems with VSD on the secondary pumping loop.<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:9.5pt;font-family:Arial;
color:black'>I wonder how to model this in E+.<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:9.5pt;font-family:Arial;
color:black'>Besides, how to know the four coefficients of the variable speed
pump? in E+, it is said that the variable speed pump model is described in the
ASHRAE secondary HVAC toolkit, but I don't have it. <u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:9.5pt;font-family:Arial;
color:black'>Can anybody give me a hint?<u1:p></u1:p></span></font><font
color=black><span style='color:black'><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=2 color=black face=Arial><span style='font-size:9.5pt;font-family:Arial;
color:black'>Thanks!<u1:p></u1:p></span></font><font color=black><span
style='color:black'><o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 color=black face=SimSun><span style='font-size:12.0pt;color:black'><br>
<br>
<br>
<br>
<o:p></o:p></span></font></p>
</div>
</div>
</div>
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<u1:p></u1:p>
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