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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>Dear Vikram,<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>I think that the definition of ton-hours
is inherently an “cooling energy delivered” or “useful energy”,
metric.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal align=center style='text-align:center'><b><span
style='font-size:13.5pt;font-family:"Times New Roman","serif";color:#1F497D'>The
Building Performance Team<br>
</span></b><b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>James V. Dirkes II, P.E., LEED AP<br>
</span></b><span style='font-size:12.0pt;font-family:"Times New Roman","serif";
color:#1F497D'>1631 Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<o:p></o:p></span></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 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"'> bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Sami,
Vikram<br>
<b>Sent:</b> Friday, September 10, 2010 4:23 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] A Question about chilled water usage<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>I’m looking at utility data
for a building on a college campus that has a central utility plant. They list
cooling energy in ton-hrs and It seems really high for all buildings across the
board. <o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>However – if you assume that
ton-hrs is the metered chilled water usage and not the chiller energy, its not
that bad. For example if the chilled water usage is 1 ton-hrs, that’s
12,000 BTU’s of cooling energy delivered. However, if whats being
measured is chilled water usage (and not chiller energy), then 1 ton-hr is not
the energy consumed by the chiller – that should be 12,000BTU/COP of the
chiller. So if the chiller COP is 4 – then that’s only 3,000
BTU’s of energy consumed to deliver that ton-hr.<o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>So – to get to the point
– does anyone know if campuses monitor their chilled water usage (in
ton-hrs) as chiller energy or cooling delivered?<o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'>(I hope this makes snese)<o:p></o:p></p>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><b><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Vikram Sami</span></b><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>, LEED AP<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Sustainable
Design Analyst<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>1382
Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>t:
404-443-7462 f: </span><span lang=ES style='font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray'>404.892.5823 </span><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>
e: vikram.sami@perkinswill.com </span><a
href="http://www.perkinswill.com/"><span style='font-size:9.0pt;font-family:
"Arial","sans-serif";color:gray;text-decoration:none'>www.perkinswill.com</span></a><span
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style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'> </span><span
style='font-size:9.0pt;font-family:"Arial","sans-serif";color:#ADD425'>Ideas +
buildings that honor the broader goals of society</span><span style='font-size:
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style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'>Years of
Design Innovation</span><b><span style='font-size:8.0pt;font-family:"Arial","sans-serif";
color:gray'><o:p></o:p></span></b></p>
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