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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Good afternoon,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am currently working on a project that is aimed to develop
a methodology to derive an accurate efficiency rating (NPLV/IPLV) for
all-variable chiller systems already in the field. The data being collected
consists of two to four weeks worth of information consisting of:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<ol style='margin-top:0in' start=1 type=1>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Chiller energy usage (pre-VFD)<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Fan motor(s) energy usage
(pre-VFD)<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Pump motor(s) energy usage
(pre-VFD)<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Condenser loop flow<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Condenser loop supply and
return temperatures<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>“Load/Evaporator”
loop flow<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>“Load/Evaporator” loop
supply and return temperatures<o:p></o:p></span></font></li>
<li class=MsoNormal style='mso-list:l0 level1 lfo1'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Outside air temperature &
humidity<o:p></o:p></span></font></li>
</ol>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The goal is of course to retrofit inefficient equipment if
necessary, but with a degree of accuracy that is going to be investment-grade. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Does anyone have any recommendations on a way to set up a
series of calculations that the above information can be utilized to provide an
accurate model of chiller performance and can then be used in an apples to
apples comparison with new equipment? Ideally, this can be done without the
need to input all the cutsheet information on a piece of equipment which may or
may not accurately represent how the chiller is operating in the field in that
climate. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Just for a reference of the kind of tool I am looking to be
able to create – the ASHRAE article created by Terrence Morris and Steve
Blaine at CH2M Hill titled, “<a
href="http://www.ashrae.org/members/doc/ASHRAEDAJ08Jul0520080630_8090903.pdf">Chiller
Plant Optimization Tool</a>” provides something very similar. The main
difference between what they did and what I am looking to do is that a cutsheet
was used to determine efficiency ratings measured by the manufacturer, whereas
I am looking to take efficiency measurements in the field without any reference
to the claimed efficiencies of a cutsheet(s).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thank you for your help – this is my first post so I
hope that the format is correct.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=1 color="#292929" face=Verdana><span
style='font-size:9.0pt;font-family:Verdana;color:#292929;font-weight:bold'>Joey
Penneman</span></font></b><font size=1 color="#292929" face=Verdana><span
style='font-size:9.0pt;font-family:Verdana;color:#292929'> | Associate Energy
Analyst </span></font><font size=1 color="#292929" face=Verdana><span
style='font-size:7.0pt;font-family:Verdana;color:#292929'><br>
</span></font><font size=1 color="#292929" face=Verdana><span style='font-size:
9.0pt;font-family:Verdana;color:#292929'>jpenneman@airadvice.com<br>
Toll-free: 866.247.4800 x602</span></font><font size=1 color="#292929"
face=Verdana><span style='font-size:7.0pt;font-family:Verdana;color:#292929'><br>
<a href="http://www.airadvice.com/"><font color="#292929"><span
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</span></font><i><font size=1 color="#3e71a3" face=Verdana><span
style='font-size:9.0pt;font-family:Verdana;color:#3E71A3;font-style:italic'>Reduce
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</span></font><font size=1 color="#292929" face=Verdana><span style='font-size:
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