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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>IPLV and NPLV values are not perfect by any means but I think
you should get comfortable with what they represent before you try to use a detailed
energy model to overcome their short comings.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Pasha
Korber-Gonzalez<br>
<b>Sent:</b> Thursday, April 01, 2010 3:11 PM<br>
<b>To:</b> James Hansen<br>
<b>Cc:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Chiller ROI - HELP!<o:p></o:p></span></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
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<p class=MsoNormal style='margin-left:.5in'>Brett,<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'>to get better part load data and
efficiency of your proposed chiller replacement, call your chill sales engineer
and ask them to generate a part load performance report for you in 10%
unloading increments, then you can see the decrease in performance efficiency
for each part-load step of the chiller. Also be sure that you recognize
if you are looking at RATED Conditions (which means chiller performance at ARI
standard conditions), or at DESIGN conditions (which are your project's
specified operating conditions--this would account for part load efficiencies
if you were running a 12-or 14 Degree delta-T across your chiller.)<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'>Before you set up a new performance
curve you will need to get this data supplied from the manufacturer.<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'> <o:p></o:p></p>
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<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'>Pasha<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:.5in'>On Thu, Apr 1, 2010 at 2:01 PM,
James Hansen <<a href="mailto:JHANSEN@ghtltd.com">JHANSEN@ghtltd.com</a>>
wrote:<o:p></o:p></p>
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<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>KW/ton drops off with decreasing part load, and since the
chiller isn’t always operating at ARI full load conditions, you
can’t just divide total chiller energy consumption (in KWH) by the total
cooling load (in btu) and hope to get anywhere near the full load rated KW/ton.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>As you go about this ROI study, make sure that when you are
analyzing your proposed chiller replacement, that you create a custom EIR vs
PLR curve based on manufacturer’s data, otherwise you’re using a
default DOE-2 curve that isn’t necessarily correct.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Furthermore, to make the study worthwhile, the existing
chiller model really needs to be normalized as best as possible to actual
building operating conditions. You can get away without doing it for a
simple comparison, but it would be more accurate if you normalized to utility
bills.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>GHT Limited<br>
James Hansen, PE, LEED AP</b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>Senior Associate</b><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>1010 N. Glebe Rd, Suite 200<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Arlington, VA 22201-4749<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>703-338-5754 (Cell)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>703-243-1200 (Office)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>703-276-1376 (Fax)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><a href="http://www.ghtltd.com/">www.ghtltd.com</a><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b> </b><o:p></o:p></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
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<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'><b>From:</b> <a
href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>
[mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Brett Sanicola<br>
<b>Sent:</b> Thursday, April 01, 2010 2:38 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Chiller ROI - HELP!<o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>I've been attempting to calculate a simple ROI for a new 250
ton chiller our client wants to install to replace his older chiller. I
ran the simulation for the default "high rise hotel" construction
which, to my luck, is quite similar to the actual building. The detailed
results, however, are not making sense to me. Specifically, when I look
at Equipment Loads and Energy Use for the Chiller, the Elec Use and Cool Load
don't coincide given the default Chiller efficiency of .67kw/ton. For
example they give a Chiller Elec Use of 535453 KWH and a Cool Load of 3294
MBTU. However, according to my calculations, at .67KW/TON, 535453 KWH
should give me closer to 9590 MBTU. I see most of the hours are in part
load range, but does the efficiency drop off that dramatically at part load
that it would explain the discrepancy? Which numbers should I base my
analysis on, the Cool Load number or the Elec Use number.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Also, on the same page (Equipment Loads and Energy Usage), it
gives me a peak load of 2436 KBTU/HR. However, when I go to the section
titled "Building Peak Load Components" the peak cooling load is
significantly less (1619 KBTU/HR)<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>At this point, I have no idea what any number represents,
since I don’t know how it was calculated.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>I greatly appreciate any help! Thanks.<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Respectfully,<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'> <o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Brett Sanicola<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>Engineer<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>ASB Engineering<o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;
margin-left:.5in'>(516) 785-4200<o:p></o:p></p>
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