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<p class=MsoNormal>Everyone,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I have a question regarding the baseline chilled water loop.
<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>ASHRAE 90.1 2007 Section G3.1.3.10 states that for large
chilled water systems serving baseline systems 7 and 8 that are greater than
300 tons the loop “shall be modeled as primary/secondary with variable speed
drives on the secondary pumping loop.”<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The following section, G3.1.3.11 further goes on to say that
“each chiller shall be modeled with separate…chilled water pumps interlocked to
operate with the associated chiller.”<o:p></o:p></p>
<p class=MsoNormal style='margin-top:12.0pt'>As clarification, does this mean three
sets of pumps are required, or just two? Are the “primary” loop pumps specified
as the chiller pumps? <o:p></o:p></p>
<p class=MsoNormal style='margin-top:12.0pt'>Two reasons why I am confused. Firstly,
the Chapter 11 baseline chilled water loop is supposed to be simulated as
primary-only variable flow, but still has the similar requirement for
interlocked chiller pumps. That would be two sets of pumps. Adding a “secondary”
loop actually adds a third set of pumps. <o:p></o:p></p>
<p class=MsoNormal style='margin-top:12.0pt'>The second reason why I am
confused is that the <a
href="http://www.energydesignresources.com/Portals/0/documents/DesignGuidelines/EDR_DesignGuidelines_%20HVAC_Simulation.pdf">Simulation
Guidebook</a> prepared for Pacific Gas and Electric (same affiliation as
CoolTools) has a visual of how to simulate “primary/secondary” loops on page
52, but they do not include chiller pumps in their image of the eQUEST
component tree. <o:p></o:p></p>
<p class=MsoNormal style='margin-top:12.0pt'>I can’t understand why three sets
of pumps would be required. I supposed a follow up question may be if the 22
watts/gpm is inclusive of all three sets of pumps. Hopefully someone can
clarify! I appreciate your help. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> </span><span
style='color:#002060'><o:p></o:p></span></p>
<p class=MsoNormal><b><span lang=EN-GB style='font-family:"Arial","sans-serif";
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<p class=MsoNormal><o:p> </o:p></p>
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