<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial"><div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">Dear Malherek,<div><br></div><div>Thank you for your advice! It really helped me!</div><div>But I still have some questions.</div><div>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.</div><div><br></div><div><div> ** Severe ** While using a two way common pipe there must be a set point in addition to the Plant Supply Outlet node.</div><div> ** ~~~ ** Currently neither plant demand inlet nor plant supply inlet have setpoints.</div><div> ** ~~~ ** Select one of the two nodes and rerun the simulation.</div><div> ** ~~~ ** Occurs for: PlantLoop=CHW LOOP</div><div><br></div>Can you please give me a hint?</div><div><br></div><div>Thanks!<br><div></div><div id="divNeteaseMailCard"></div><br>At 2011-10-25 22:50:54,"Malherek, Elyse" <<a href="mailto:elyse.malherek@mcquay.com">elyse.malherek@mcquay.com</a>> wrote:<br> <blockquote id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
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<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:11.0pt;
font-family:Arial">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.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:11.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:11.0pt;
font-family:Arial">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¡±<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:11.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:11.0pt;
font-family:Arial">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.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:11.0pt;
font-family:Arial"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size:11.0pt;
font-family:Arial">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.<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"><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 size="2" color="navy"><span style="font-size:10.0pt;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 size="2" color="navy"><span style="font-size:10.0pt;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">McQuay International</span></font><font size="2" color="navy"><span style="font-size:10.0pt;color:navy"><o:p></o:p></span></font></p>
<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 size="2" color="navy"><span style="font-size:10.0pt;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 size="2" color="navy"><span style="font-size:10.0pt;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><font size="2" face="Arial"><span style="font-size:10.0pt;font-family:Arial"><o:p></o:p></span></font></p>
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<hr size="2" width="100%" align="center" tabindex="-1">
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<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">
<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><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>
<p class="MsoNormal"><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.<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">I wonder how to model this in E+.<o:p></o:p></span></font></p>
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<p class="MsoNormal"><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. <o:p></o:p></span></font></p>
</div>
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<p class="MsoNormal"><font size="2" color="black" face="Arial"><span style="font-size:
9.5pt;font-family:Arial;color:black">Can anybody give me a hint?<o:p></o:p></span></font></p>
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<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>
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<br>
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<o:p></o:p></span></font></p>
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