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In general, AHRI (they are not ARI any longer) standards can be
downloaded free of charge from their web site. A paper copy might
cost $45, but I don't know that, because who would want to pay $45 for
something they could download free and print as many times as they
like?<br><br>
AHRI 210/240, which defines SEER (among other things) can be downloaded
here:<br><br>
<a href="http://www.ahrinet.org/ARI/util/showdoc.aspx?doc=1336" eudora="autourl">
http://www.ahrinet.org/ARI/util/showdoc.aspx?doc=1336</a><br><br>
AHRI 550/590, which defines IPLV (among other things) can be downloaded
here:<br><br>
<a href="http://www.ahrinet.org/ARI/util/showdoc.aspx?doc=1472" eudora="autourl">
http://www.ahrinet.org/ARI/util/showdoc.aspx?doc=1472</a><br><br>
The units of IPLV are not "ambiguous." They are either
COP (for the SI part of the world), which is dimensionless, or kW/ton for
the rest of it. There are formulas for calculating both in AHRI
550/590.<br><br>
Bill Bahnfleth<br><br>
At 02:53 PM 12/22/2009, Carolyn Balant wrote:<br>
<blockquote type=cite class=cite cite=""><font size=2>A colleague of mine
has an answer about this below.<br>
<br>
Regards,<br>
<br>
</font><font size=2 color="#4D4D4D"><b>Carolyn Balant
</b></font><font size=1 color="#4D4D4D">P.Eng., LEED AP <br>
<i>Senior Energy Engineer <br>
</i></font><font size=2> <br>
</font><font size=2 color="#FFBA00"><b><i><a href="http://www.mcw.com">
MCW Custom Energy Solutions Ltd. </a><br>
</b></font><font size=2 color="#4D4D4D">156 Front Street West Suite 600
<br>
Toronto, ON M5J 2L6 <br>
Phone 416-598-2920 ext.315 </i><br>
<i>Fax 416-598-5394 <br>
</i></font><font size=2> <br>
</font><font size=1 color="#4D4D4D"><i>This e-mail may be privileged and
confidential. Any unauthorized use is strictly prohibited. If you
received this e-mail in error, please contact the sender directly. <br>
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<br>
</font><font size=2 color="#000080">Carolyn:<br>
<br>
Short answer: <br>
Amadeep should use SEER for his project. IPLV is used for chillers,
but it is no better than SEER. I believe EER and SEER include fan
power, but I am not positive. I know that IPLV does not include
power for any peripherals.<br>
<br>
Long answer:<br>
EER (BTUH/watt) and COP (dimensionless) are rated at full load.
<br>
SEER (seasonal efficiency ratio) and IPLV are supposedly based on an
entire “average” season of operation in a “typical” system, with a large
number of assumptions about load profiles, outdoor temperature profiles,
presence or absence of economizer cycles, and operating profiles.
SEER is in BTUH/Watt, and IPLV is either in kW/ton or expressed as COP
(dimensionless). The ”V” stands for Value because, incredibly, the
units of IPLV are ambiguous! <br>
<br>
IPLV is generally used for chillers. It is based on:<br>
1% of time at 100% load<br>
42% of time at 75% load<br>
45% of time at 50% load<br>
12% of time at 25% load,<br>
with different assumed condenser water temperatures at the various
loads.<br>
<br>
(There are published formulae for calculating IPLV with any arbitrary
load profile. Unfortunately, and likely because of the ambiguity of the
units, the authors used the COP form of the formula for kW/ton, and vice
versa. Because COP and kW/ton are essentially reciprocals of each
other, the formulae don’t work. But that’s another story.)<br>
<br>
SEER is another ARI standard, presumably based on a similar load
profile. I don’t know what the profile looks like, because ARI
charges $45 for a peek at the standard. And guess what…<br>
<br>
Regards,<br>
<br>
Jamie<br>
<br>
</font><font size=2> <br>
</font><font size=2 color="#4D4D4D"><b>Jamie Smith
</b></font><font size=1 color="#4D4D4D">P.Eng <br>
<i>Mechanical Engineer <br>
</i></font><font size=2> <br>
</font><font face="Times New Roman, Times" color="#008000"><b><i>
<a href="http://www.mcw.com">MCW Consultants Ltd. </a><br>
</b></font><font face="Times New Roman, Times" color="#4D4D4D">156 Front
Street West Suite 600 </font><font size=2 color="#4D4D4D"><br>
</font><font face="Times New Roman, Times" color="#4D4D4D">Toronto, ON
M5J 2L6 </font><font size=2 color="#4D4D4D"><br>
</font><font face="Times New Roman, Times" color="#4D4D4D">Phone
416-598-2920 ext.264 </font><font size=2 color="#4D4D4D"><br>
</font><font face="Times New Roman, Times" color="#4D4D4D">Fax
416-598-5394 <br>
</i></font><font size=2> <br>
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confidential. Any unauthorized use is strictly prohibited. If you
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<hr>
<div align="center"></font></div>
<font face="Tahoma" size=2><b>From:</b> Paul Diglio
[<a href="mailto:paul.diglio@sbcglobal.net" eudora="autourl">
mailto:paul.diglio@sbcglobal.net</a>] <br>
<b>Sent:</b> Monday, December 21, 2009 5:15 AM<br>
<b>To:</b> Amandeep Singh; equest-users@lists.onebuilding.org; John
Aulbach<br>
<b>Subject:</b> Re: [Equest-users] IPLV in Heat Pumps<br>
</font><font face="Times New Roman, Times"> <br>
Amandeep:<br>
<br>
I agree with John. Actually, I believe IPLV is a somewhat new
rating that applies to larger systems. EER or COP are much more
accurate ratings.<br>
<br>
I am confused about the SEER and IPLV ratings. What temperature bin
do they use to calculate these numbers? It would seem to me that an
AC system in the south would operate at a higher load throughout the
cooling season than one in the northeast. Of course, it would
depend on how the system was sized. An oversized system will
operate at a much lower load ratio than a tightly sized system.<br>
<br>
Does anyone know the formula?<br>
<br>
Paul Diglio, CEM<br>
<br>
--- On <b>Sun, 12/20/09, John Aulbach
<i><jra_sac@yahoo.com></i></b> wrote:<br>
</font>
<dl><br>
<dd>From: John Aulbach <jra_sac@yahoo.com><br>
<dd>Subject: Re: [Equest-users] IPLV in Heat Pumps<br>
<dd>To: "Amandeep Singh"
<amandeep.singh@energycenter.org>,
equest-users@lists.onebuilding.org<br>
<dd>Date: Sunday, December 20, 2009, 9:02 PM<br>
<dd>Amandeeph:<br>
<dd> <br>
<dd>As far as I am concerned, IPLV is a mythical number, like SEER. It is
based on assumed levels of usage for a pumed annual usage. If your truly
need part load curves, ask the manufacturer for the 75%, 50% and 25%
points. You cannot evolve these four numbers out of a single mnumber
(IPLV).<br>
<dd> <br>
<div align="center"><br>
</div>
<dd><font face="Tahoma" size=2>From:</b> Amandeep Singh
<amandeep.singh@energycenter.org><br>
<dd>To:</b> equest-users@lists.onebuilding.org<br>
<dd>Sent:</b> Thu, December 17, 2009 1:03:45 PM<br>
<dd>Subject:</b> [Equest-users] IPLV in Heat Pumps<br>
</font>
<dd><font face="Times New Roman, Times">Hello everyone,<br>
<dd> <br>
<dd>I was working on a school model located in Lakeside, San Diego
county. The school has Bard wall mount heat pumps (capacity – 2 to 4
tons), really old one. I got manufacture data of the old and new units
for replacement. The new units data has EER, IPLV and COP ratings.
I would prefer to use IPLV instead of EER rating in case of
cooling to calculate savings. The eQuest does have options
for EER and SEER but not for IPLV in the schematic design wizard.
What should I do here? <br>
<dd> <br>
<dd>Does it make sense to use IPLV instead of EER to calculate savings
for the Lakeside? <br>
<dd> <br>
</font><br>
</dl><font face="Times New Roman, Times">Thanks,<br>
Aman <br>
<br>
</font><font color="#0070C0"> <br>
</font>
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<br>
<font size=2>Amandeep Singh</b><br>
Energy Engineer<br>
8690 Balboa Ave, Suite 100</font><br>
<font size=2>San Diego, CA 92123-1502</font><br>
<font size=2>858.634.4729
</font><font size=2 color="#666666">phone</font><br>
858.244.1178<font size=2 color="#666666"> fax</font><br>
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<font size=2 color="#666666"> web<br>
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