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<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><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Brett
Sanicola</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Engineer</span><span
style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>ASB
Engineering</span><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><o:p></o:p></span></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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