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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'>I raised the question initially with John
offline. My interpretation of “pump power shall be 22 W/<span class=SpellE>gpm</span>”
is that each pump in a primary/secondary system should have this power. There
is no wording that indicates that it should be <span class=GramE>otherwise,</span>
though I see Richard’s point that “<span class=SpellE>gpm</span>” could be
interpreted to mean CHW produced. My chilled water system design experience is
limited, so I don’t have a sense of “typical” CHW system pumping power. Using
only the system that I am currently modeling for a project, the proposed
primary pumps are 28 BHP and 953 <span class=SpellE>gpm</span>, or 21.6 W/<span
class=SpellE>gpm</span> for the primary loop. The secondary CHW pump uses a 20
HP pump at 380 <span class=SpellE>gpm</span>. I don’t have the BHP, but using
16 BHP results in 31 W/<span class=SpellE>gpm</span> for the secondary loop.
So, my sample size of one already uses more pump power than a baseline system
with 22 W/<span class=SpellE>gpm</span> applied to each of the primary and
secondary pumps.<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:
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<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
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</span></font><font size=1 color=navy face=Arial><span style='font-size:9.0pt;
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font-family:Arial;color:black;mso-no-proof:yes'><a
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– the forest AND the trees.</span></font><font size=5 color=green
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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 face=Tahoma><span
style='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>John T. Forester<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, November 16, 2010
10:59 AM<br>
<b><span style='font-weight:bold'>To:</span></b> 'James Hansen'<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]
Baseline Chilled Water Loop</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="Century Gothic"><span style='font-size:
10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>James,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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;font-family:Calibri;color:#1F497D'>I see your argument
that it is a challenge to design to 22 W/gpm. However, using your example
of 2,000 gpm and 22 W/gpm, are you suggesting that a 44 kW (60-hp)
motor is acceptable for a primary-only pump on a 1,000-ton chiller?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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;font-family:Calibri;color:#1F497D'>Section 11 states
that the 22 W/gpm was chosen based on 75 ft of head and 65% combined pump/motor
efficiency (the 90.1 User’s Guide actually says 60%) for a primary-only
loop. This would include all system pressure drops. Again, this is
not easy to design to. But at least the Section 11 example is clear on
how much pump energy to include in the baseline design.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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;font-family:Calibri;color:#1F497D'>John<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=1 color=gray face=Arial><span style='font-size:
8.5pt;font-family:Arial;color:gray'>John T. Forester, P.E., LEED AP, Mechanical
Design Engineer </span></font><b><font size=1 color="#0000a0" face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:#0000A0;font-weight:bold'>I BVH
Integrated Services I</span></font></b><b><font size=1 color=black face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:black;font-weight:bold'> </span></font></b><font
size=1 color=gray face=Arial><span style='font-size:8.5pt;font-family:Arial;
color:gray'>617.658.9008 tel </span></font><b><font size=1 color="#0000a0"
face=Arial><span style='font-size:8.5pt;font-family:Arial;color:#0000A0;
font-weight:bold'>I</span></font></b><b><font size=1 color=gray face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:gray;font-weight:bold'> </span></font></b><font
size=1 color=gray face=Arial><span style='font-size:8.5pt;font-family:Arial;
color:gray'>617.244.3753 fax</span></font><font size=1 color="#0000a0"
face=Arial><span style='font-size:8.5pt;font-family:Arial;color:#0000A0'> <b><span
style='font-weight:bold'>I</span></b></span></font><b><font size=1 color=gray
face=Arial><span style='font-size:8.5pt;font-family:Arial;color:gray;
font-weight:bold'> </span></font></b><font size=1 color=gray face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:gray'>One Gateway Center Suite
506, Newton MA 02458 </span></font><b><font size=1 color="#0000a0" face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:#0000A0;font-weight:bold'>I <a
href="http://www.bvhis.com">www.bvhis.com</a> I Hartford ● New Haven
● Boston</span></font></b><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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 face=Tahoma><span
style='font-family:Tahoma'> James Hansen [mailto:JHANSEN@ghtltd.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, November 16, 2010
10:23 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Richard Ellison; John T.
Forester; equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users]
Baseline Chilled Water Loop<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>As I indicated
earlier, everyone has their own opinion about this credit. But consider
this:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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;font-family:Calibri;color:#1F497D'>The pressure drop
across a cooling tower and condenser water piping system is roughly the same as
the pressure drop thru the chiller evaporator and primary loop of a
primary/secondary chilled water plant (on a per gpm basis once you correct for
the higher flow rates of the condenser side). In other words, on a PER
GPM basis, a typical water-cooled chilled water plant will have similar pump HP
per GPM for the condenser water system and primary chilled water system.
Not identical, but similar. I’ve got 10+ recent base-building designs
that confirm this. 90.1 requires 19 W / gpm for a condenser water system,
and you are saying that you only model 6 W / gpm for the primary chilled water
pump? That is below realistic design values for a primary system, at
least in my opinion. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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;font-family:Calibri;color:#1F497D'>Example: 1,000
ton chiller at 54/42 requiring 2,000 GPM. 6 W / gpm thru the primary loop
would only use 12.0 KW, or a 15 hp motor frame. If you assume a chiller
evaporator loss of 15 ft, and make only modest estimates of an additional 20 ft
for piping losses, strainers, mixing valves, bypass valves, etc (35 ft total),
you can try and select any pump you want but you’re going to need at least a 25
hp motor. And with most chilled water plants, even 35 ft seems low for
the pressure drop across a primary loop. I don’t see how 6 W / gpm can
accurately represent a chilled water primary loop even in the most efficient
central plant designs. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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;font-family:Calibri;color:#1F497D'>Furthermore, if
ASHRAE had wanted us to prorate the 22 W / gpm between the primary and
secondary loops, wouldn’t they have instructed us to do that, especially since
there is a huge difference in energy consumption depending on which of the two
loops has the higher W / gpm? Have they instructed us to do that in an
addendum?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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;font-family:Calibri;color:#1F497D'>I stand by my use of
22 W / gpm for each pump, and have never had a reviewer instruct me to do
otherwise (which of course doesn’t mean that I’m not wrong). <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><b><font size=2 color=teal face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:teal;font-weight:bold'>GHT
Limited<br>
</span></font></b><b><font size=2 face=Arial><span style='font-size:11.0pt;
font-family:Arial;font-weight:bold'><ns1:PersonName w:insAuthor="Unknown"
w:insDate="2010-11-16T14:18:00Z" w:endInsAuthor="Unknown"
w:endInsDate="2010-11-16T14:18:00Z"><font color=black><span style='color:black'>James
Hansen</span></font></ns1:PersonName></span></font></b><b><font size=2
color=black face=Calibri><span style='font-size:11.0pt;font-family:Calibri;
color:black;font-weight:bold'>, PE, LEED AP<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>Senior
Associate</span></font></b><b><font size=2 color=black face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:black;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'><ns1:Street w:insAuthor="Unknown"
w:insDate="2010-11-16T14:18:00Z" w:endInsAuthor="Unknown"
w:endInsDate="2010-11-16T14:18:00Z"><ns1:address w:insAuthor="Unknown"
w:insDate="2010-11-16T14:18:00Z" w:endInsAuthor="Unknown"
w:endInsDate="2010-11-16T14:18:00Z"><st1:Street w:st="on"><st1:address w:st="on"><font
color=black><span style='color:black'>1010 N. Glebe Rd, Suite 200</span></font></st1:address></st1:Street></ns1:address></ns1:Street></span></font><font
size=2 color="#1f497d" face=Calibri><span style='font-size:11.0pt;font-family:
Calibri;color:#1F497D'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 face=Arial><span style='font-size:7.5pt;
font-family:Arial'><ns1:place w:insAuthor="Unknown"
w:insDate="2010-11-16T14:18:00Z" w:endInsAuthor="Unknown"
w:endInsDate="2010-11-16T14:18:00Z"><ns1:City w:insAuthor="Unknown"
w:insDate="2010-11-16T14:18:00Z" w:endInsAuthor="Unknown"
w:endInsDate="2010-11-16T14:18:00Z"><st1:place w:st="on"><st1:City w:st="on"><font
color=black><span style='color:black'>Arlington</span></font></st1:City></ns1:City></st1:place><font
color=black><span style='color:black'>, </span></font><ns1:State
w:insAuthor="Unknown" w:insDate="2010-11-16T14:18:00Z" w:endInsAuthor="Unknown"
w:endInsDate="2010-11-16T14:18:00Z"><st1:State w:st="on"><font color=black><span
style='color:black'>VA</span></font></st1:State></ns1:State><font
color=black><span style='color:black'> </span></font><ns1:PostalCode
w:insAuthor="Unknown" w:insDate="2010-11-16T14:18:00Z" w:endInsAuthor="Unknown"
w:endInsDate="2010-11-16T14:18:00Z"><st1:PostalCode w:st="on"><font
color=black><span style='color:black'>22201-4749</span></font></st1:PostalCode></ns1:PostalCode></ns1:place></span></font><font
size=2 color=black face=Calibri><span style='font-size:11.0pt;font-family:Calibri;
color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>703-338-5754 (Cell)</span></font><font
size=2 color=black face=Calibri><span style='font-size:11.0pt;font-family:Calibri;
color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>703-243-1200 (Office)</span></font><font
size=2 color=black face=Calibri><span style='font-size:11.0pt;font-family:Calibri;
color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>703-276-1376 (Fax)</span></font><font
size=2 color=black face=Calibri><span style='font-size:11.0pt;font-family:Calibri;
color:black'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=teal face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:teal'><a href="http://www.ghtltd.com/"><font
size=2><span style='font-size:10.0pt'>www.ghtltd.com</span></font></a><o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color="#31849b" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#31849B;font-weight:bold'><o:p> </o:p></span></font></b></p>
</div>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;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 face=Tahoma><span
style='font-family:Tahoma'> Richard Ellison [mailto:REllison@southlandind.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, November 16, 2010
9:27 AM<br>
<b><span style='font-weight:bold'>To:</span></b> James Hansen; John T.
Forester; equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: [Equest-users]
Baseline Chilled Water Loop<o:p></o:p></span></font></p>
</div>
</div>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>I usually don’t
respond to the information on this forum but I completely disagree with this
latest e-mail.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>The chilled water is
supplied by a chiller not a pump. “The baseline design pump power shall
be 22 W / gpm” is for the GPM delivered by the chiller and the pumping system
does not matter. The power is specified per GPM not per pump. If
you use primary/secondary then the energy is divided between the pumps.
We usually assume 6W/gpm for the primary pump and 16W/gpm for the secondary
pump. If one uses 22W/gpm for each pump, then the total of 44W/gpm the
pump energy is huge and the savings unrealistic.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 color="#1f497d"
face=Arial><span style='font-size:8.0pt;font-family:Arial;color:#1F497D'>R I C
H A R D E L L I S O N</span></font><font color="#e36c0a"><span
style='color:#E36C0A'><br>
</span></font><font size=1 color="#1f497d" face=Arial><span style='font-size:
8.0pt;font-family:Arial;color:#1F497D'>PE, CEM, CEA, CTAB, CBEP, LEED AP </span></font><o:p></o:p></p>
<p class=MsoNormal style='text-autospace:none'><font size=1 color="#1f497d"
face=Arial><span style='font-size:8.0pt;font-family:Arial;color:#1F497D'>Energy
Engineer</span></font><font color="#e36c0a"><span style='color:#E36C0A'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#1F497D'>Southland Industries</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#1F497D'>22340 Dresden Street,
Suite 177</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#1F497D'>Dulles, VA 20166</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#1F497D'>Office: 703.834.5570</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#1F497D'>Direct: 703.834.2438</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color="#1f497d" face=Arial><span
style='font-size:8.0pt;font-family:Arial;color:#1F497D'>Fax: 703.834.5572</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></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 face=Tahoma><span
style='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>James Hansen<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, November 16, 2010
8:50 AM<br>
<b><span style='font-weight:bold'>To:</span></b> John T. Forester;
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users]
Baseline Chilled Water Loop</span></font><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>I’ve seen different
people provide different responses to this question, but I’ve always modeled
EACH pump in a chilled water system as 22 W / gpm. Don’t prorate.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>“The baseline design
pump power shall be 22 W / gpm”. It can’t be any more clear than
this. 90.1 tells you when you need a primary / secondary system, and when
you can get away with primary only. In other words, they are telling you
how many pumps you need to model. And they specifically list the pump
power in terms of GPM, which is PER PUMP. Nowhere does it say to prorate.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><b><font size=2 color=teal face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:teal;font-weight:bold'>GHT
Limited<br>
</span></font></b><b><font size=2 color=black face=Arial><span
style='font-size:11.0pt;font-family:Arial;color:black;font-weight:bold'>James
Hansen</span></font></b><b><font size=2 color=black face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:black;font-weight:bold'>, PE,
LEED AP</span></font></b><o:p></o:p></p>
<p class=MsoNormal><b><font size=2 color=black face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:black;font-weight:bold'>Senior
Associate</span></font></b><o:p></o:p></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>1010 N. Glebe Rd, Suite 200</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>Arlington, VA 22201-4749</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>703-338-5754 (Cell)</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>703-243-1200 (Office)</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color=black face=Arial><span style='font-size:
7.5pt;font-family:Arial;color:black'>703-276-1376 (Fax)</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color=teal face=Arial><span style='font-size:
11.0pt;font-family:Arial;color:teal'><a href="http://www.ghtltd.com/"><font
size=2><span style='font-size:10.0pt'>www.ghtltd.com</span></font></a></span></font><o:p></o:p></p>
<p class=MsoNormal><b><font size=2 color="#31849b" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#31849B;font-weight:bold'> </span></font></b><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></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 face=Tahoma><span
style='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>John T. Forester<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, November 16, 2010
8:41 AM<br>
<b><span style='font-weight:bold'>To:</span></b>
equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Equest-users]
Baseline Chilled Water Loop</span></font><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Fellow Modelers,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>I’ve received a
comment regarding my response last week on how to model CHW pumps for App.
G. Specifically, item 7 (see below) and how the 22 W/gpm is defined
for a primary secondary configuration. Section G3.1.3.10 can be
interpreted (at least) two different ways.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>First, Section
G3.1.3.10 Chilled-Water Pumps (Systems 7 and 8)</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:203.25pt;
margin-bottom:0in;margin-left:.5in;margin-bottom:.0001pt'><font size=2
color="#1f497d" face=Calibri><span style='font-size:11.0pt;font-family:Calibri;
color:#1F497D'>“The baseline design pump power shall be 22 W/gpm.
Chilled-water systems with a cooling capacity of 300 tons or more shall be
modeled as primary/secondary systems with variable-speed drives on the
secondary pumping loop. Chilled-water pumps in systems serving less than
300 tons cooling capacity shall be modeled as primary/secondary systems
with secondary pump riding the pump curve.”</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>The question: </span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Should
each primary and secondary pump be sized for 22 W/gpm OR should this
“design pump power” be divided up (in some way) between the primary and
secondary pumps?</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Position A:</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>If
the 22 W/gpm should be the TOTAL pumping power, there is no guidance on how to
divvy up this requirement and the constant volume primary pumps could be sized
for 20 W/gpm and the secondary (VSD or riding pump curve) can be allotted
2 W/gpm. This would maximize the pump energy in the baseline model.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Position B:</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Sizing
each primary pump and secondary pump to 22 W/gpm will over-estimate the
baseline pump energy (VSD or riding pump curve) and this is not the intent of
90.1. The “design pump power” of 22 W/gpm is the same requirement as
Section 11 (ECB method) just with a different pumping configuration.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>How do you interpret
(and model) 90.1 App. G chilled-water pump power requirement of
22 W/gpm? (Your interpretation doesn’t necessarily have to be one of
the positions above.)</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Thanks,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>John</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=1 color=gray face=Arial><span style='font-size:
8.5pt;font-family:Arial;color:gray'>John T. Forester, P.E., LEED AP, Mechanical
Design Engineer </span></font><b><font size=1 color="#0000a0" face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:#0000A0;font-weight:bold'>I BVH
Integrated Services I</span></font></b><b><font size=1 color=black face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:black;font-weight:bold'> </span></font></b><font
size=1 color=gray face=Arial><span style='font-size:8.5pt;font-family:Arial;
color:gray'>617.658.9008 tel </span></font><b><font size=1 color="#0000a0"
face=Arial><span style='font-size:8.5pt;font-family:Arial;color:#0000A0;
font-weight:bold'>I</span></font></b><b><font size=1 color=gray face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:gray;font-weight:bold'> </span></font></b><font
size=1 color=gray face=Arial><span style='font-size:8.5pt;font-family:Arial;
color:gray'>617.244.3753 fax</span></font><font size=1 color="#0000a0"
face=Arial><span style='font-size:8.5pt;font-family:Arial;color:#0000A0'> <b><span
style='font-weight:bold'>I</span></b></span></font><b><font size=1 color=gray
face=Arial><span style='font-size:8.5pt;font-family:Arial;color:gray;
font-weight:bold'> </span></font></b><font size=1 color=gray face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:gray'>One Gateway Center Suite
506, Newton MA 02458 </span></font><b><font size=1 color="#0000a0" face=Arial><span
style='font-size:8.5pt;font-family:Arial;color:#0000A0;font-weight:bold'>I <a
href="http://www.bvhis.com">www.bvhis.com</a> I Hartford ● New Haven
● Boston</span></font></b><o:p></o:p></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 face=Tahoma><span
style='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>John T. Forester<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 12, 2010
5:47 PM<br>
<b><span style='font-weight:bold'>To:</span></b> 'Smith, Michael'<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]
Baseline Chilled Water Loop</span></font><o:p></o:p></p>
</div>
</div>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Hi Michael,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>I think I can answer
your App G question.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>First, in the
context of 90.1, “variable flow” does not necessarily mean variable
speed. It just means riding the pump curve with a bypass to minimize
pumping pressure drops through the loop during part-load operation.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><u><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>App. G Chilled Water
Modeling <=300 tons</span></font></u><o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face="Century Gothic"><span style='font-size:10.0pt;mso-fareast-font-family:
"Century Gothic";mso-bidi-font-family:"Century Gothic"'><span style='mso-list:
Ignore'>1.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Create
a chilled water circulation loop and name it something like “Pri CHW Loop.”</span></font><o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face="Century Gothic"><span style='font-size:10.0pt;mso-fareast-font-family:
"Century Gothic";mso-bidi-font-family:"Century Gothic"'><span style='mso-list:
Ignore'>2.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Create
another chilled water circulation loop and name it something like “Sec CHW
Loop.”</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>a.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Change
the Loop Sub-type of this loop to Secondary and choose “Pri CHW Loop” as the
primary loop.</span></font><o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face="Century Gothic"><span style='font-size:10.0pt;mso-fareast-font-family:
"Century Gothic";mso-bidi-font-family:"Century Gothic"'><span style='mso-list:
Ignore'>3.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Create
a circulation pump and name it something like “Sec CHW Pump.”</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>a.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Set
this pump as variable speed. I believe you are allowed to set the minimum
speed to 50% for App. G. (someone here on the list can correct me on this if
I’m wrong).</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>b.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>By
default, the valve on this loop is three-way and will circulate water directly
back to the primary loop as long as there are two-way valves at your terminal
units (AHU coils, FCUs, etc).</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>c.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Attach
this pump to the Sec CHW Loop.</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>d.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Change
the loop head sensor location to “at coils.”</span></font><o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face="Century Gothic"><span style='font-size:10.0pt;mso-fareast-font-family:
"Century Gothic";mso-bidi-font-family:"Century Gothic"'><span style='mso-list:
Ignore'>4.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Create
a condenser water loop and CW pump and attach the pump to the loop.</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>a.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Also
create an open tower heat rejection device and attach it to your condenser
water loop.</span></font><o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face="Century Gothic"><span style='font-size:10.0pt;mso-fareast-font-family:
"Century Gothic";mso-bidi-font-family:"Century Gothic"'><span style='mso-list:
Ignore'>5.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Create
1 primary chilled water pump per chiller. They won’t be attached to
anything yet and will be at the bottom of the component tree.</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>a.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>The
default for a pump is “One-Speed.” This is fine and the pump will act as
a constant volume pump with the three-way valve on the secondary loop.</span></font><o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face="Century Gothic"><span style='font-size:10.0pt;mso-fareast-font-family:
"Century Gothic";mso-bidi-font-family:"Century Gothic"'><span style='mso-list:
Ignore'>6.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Create
a water-cooled chiller and choose the “Pri CHW Loop 1” and “water-cooled.”</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>a.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Since
there is no pump attached to the primary loop, you will be required to select a
pump for the chiller.</span></font><o:p></o:p></p>
<p class=msolistparagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo2'><![if !supportLists]><font size=2 face="Century Gothic"><span
style='font-size:10.0pt;mso-fareast-font-family:"Century Gothic";mso-bidi-font-family:
"Century Gothic"'><span style='mso-list:Ignore'>b.<font size=1
face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>You
will also be required to select the Condenser water loop</span></font><o:p></o:p></p>
<p class=msolistparagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><font
size=2 face="Century Gothic"><span style='font-size:10.0pt;mso-fareast-font-family:
"Century Gothic";mso-bidi-font-family:"Century Gothic"'><span style='mso-list:
Ignore'>7.<font size=1 face="Times New Roman"><span style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]><font size=2 color="#1f497d"
face=Calibri><span style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>Now
what you have to do is size your pumps so the total pump energy is 22
W/pm. You will want to do something like 4-5 W/gpm for each primary pump
and use the remaining for the secondary pump.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'>This system is
primary/secondary with constant flow through each chiller and variable
speed/variable flow through the secondary loop. Since each chiller has a
pump directly attached to it, each primary pump will automatically cycle on and
off with the chillers.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
style='font-size:11.0pt;font-family:Calibri;color:#1F497D'> </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 color="#1f497d" face=Calibri><span
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<p class=MsoNormal><font size=1 color=gray face=Arial><span style='font-size:
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style='font-size:8.5pt;font-family:Arial;color:#0000A0;font-weight:bold'>I BVH
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style='font-size:8.5pt;font-family:Arial;color:#0000A0;font-weight:bold'>I </span></font></b><a
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8.5pt;font-family:Arial;font-weight:bold'>www.bvhis.com</span></font></b></a><b><font
size=1 color="#0000a0" face=Arial><span style='font-size:8.5pt;font-family:
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<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 face=Tahoma><span
style='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>Smith, Michael<br>
<b><span style='font-weight:bold'>Sent:</span></b> Friday, November 12, 2010
3:55 PM<br>
<b><span style='font-weight:bold'>To:</span></b> equest-users@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Equest-users] Baseline
Chilled Water Loop</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'>Everyone,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'>I have a question regarding the baseline chilled water loop. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'>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></span></font></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'>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></span></font></p>
<p class=MsoNormal style='margin-top:12.0pt'><font size=2 face="Century Gothic"><span
style='font-size:10.0pt'>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></span></font></p>
<p class=MsoNormal style='margin-top:12.0pt'><font size=2 face="Century Gothic"><span
style='font-size:10.0pt'>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></span></font></p>
<p class=MsoNormal style='margin-top:12.0pt'><font size=2 face="Century Gothic"><span
style='font-size:10.0pt'>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></span></font></p>
<p class=MsoNormal style='margin-top:12.0pt'><font size=2 face="Century Gothic"><span
style='font-size:10.0pt'>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></span></font></p>
<p class=MsoNormal><font size=2 face="Century Gothic"><span style='font-size:
10.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt;font-family:"Times New Roman"'> </span></font><o:p></o:p></p>
<p class=MsoNormal><b><font size=2 color="#333399" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333399;font-weight:bold'>Michael
J. Smith, EIT, LEED</span></font></b><sup><font color="#333399" face=Arial><span
style='font-family:Arial;color:#333399'>® </span></font></sup><b><font
color="#333399" face=Arial><span style='font-family:Arial;color:#333399;
font-weight:bold'>AP</span></font></b><o:p></o:p></p>
<p class=MsoNormal><b><font size=1 color="#333399" face=Arial><span
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<p class=MsoNormal><b><font size=1 color="#66737d" face=Arial><span
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