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<p class=MsoNormal><span style='color:#1F497D'>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></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>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></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>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></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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</span></b><b><span style='font-family:"Arial","sans-serif"'><ns0:PersonName><span
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
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<p class=MsoNormal><b><span style='color:#31849B'><o:p> </o:p></span></b></p>
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><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>Brett
Sanicola<br>
<b>Sent:</b> Thursday, April 01, 2010 2:38 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Chiller ROI - HELP!<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>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> <o:p></o:p></p>
<p class=MsoNormal>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> <o:p></o:p></p>
<p class=MsoNormal>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> <o:p></o:p></p>
<p class=MsoNormal>I greatly appreciate any help! Thanks.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Respectfully,</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> </span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Brett
Sanicola</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Engineer</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>ASB
Engineering</span><o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>(516)
785-4200</span><o:p></o:p></p>
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