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color=#0000ff><SPAN class=366473221-12102007>Good point, John
-- but there may be an arguably easier way to not double-count
fan energy...following is a reprint from the </SPAN><SPAN
class=366473221-12102007>DOE2 documentation:</SPAN></FONT></DIV>
<H5 class=d2h_main_topic
style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 10pt; MARGIN: 0pt; PADDING-TOP: 0pt"> </H5>
<H5 class=d2h_main_topic
style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 10pt; MARGIN: 0pt; PADDING-TOP: 0pt">COOLING-EIR</H5>
<P class=MsoBodyText
style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 10pt; MARGIN: 0pt; PADDING-TOP: 0pt">The
Electric Input Ratio (EIR), or 1/(Coefficient of Performance), for the cooling
unit at ARI rated conditions. The program defines EIR to be the ratio of the
electric energy input to the rated capacity, when both the energy input
and rated capacity are expressed in the same units. This EIR is at ARI rated
conditions, i.e., without correction for different temperature or part load.
</P>
<P class=MsoBodyText
style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 10pt; MARGIN: 0pt; PADDING-TOP: 0pt">Note:
If you include fan electric energy consumption in your value of COOLING-EIR,
then you should <FONT color=#ff0000>set</FONT> <FONT
color=#ff0000>SUPPLY-KW/FLOW to zero (and SUPPLY-STATIC, SUPPLY-EFF and
SUPPLY-DELTA-T should be omitted). Otherwise, the supply fan electrical energy
will be double counted.</FONT> For commercial systems the default value of
COOLING-EIR includes compressor and outdoor fan energy, but not indoor fan
energy. </P>
<DIV class=d2h_main_topic
style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 10pt; MARGIN: 0pt; PADDING-TOP: 0pt">
<H5>HEATING-EIR</H5>
<P class=MsoBodyText>Electric Input Ratio, or 1/(heating Coefficient of
Performance), for the heat pump. This EIR is at ARI rated conditions, i.e.,
without corrections for temperature or part load. The <STRONG><FONT
color=#ff0000>program-calculated</FONT></STRONG> HEATING-EIR does not include
fan power and heat. This keyword is appropriate only to HP, RESYS, and PTAC
systems.<SPAN class=366473221-12102007> </SPAN></P></DIV>
<DIV class=d2h_main_topic
style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 10pt; MARGIN: 0pt; PADDING-TOP: 0pt"><FONT
color=#0000ff><SPAN class=366473221-12102007>Mysteriously, the HEATING-EIR
</SPAN>documentation makes no mention of the<SPAN class=366473221-12102007>
</SPAN>fan energy double counting issue<SPAN class=366473221-12102007>.
But if you're consistent and use 3.41 divided by the manufacturers published EER
for the cooling EIR, the inverse of the published COP for the heating
EIR, </SPAN>and <SPAN class=366473221-12102007>zero-</SPAN>out the supply
fan energy<SPAN class=366473221-12102007> as described in the
documentaion</SPAN><SPAN class=366473221-12102007> ... </SPAN><SPAN
class=366473221-12102007>then Bob's your uncle, right? </SPAN></FONT></DIV>
<DIV class=d2h_main_topic
style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 10pt; MARGIN: 0pt; PADDING-TOP: 0pt"><FONT
color=#0000ff>FWIW, that's the way we do it<SPAN
class=366473221-12102007>...</SPAN></FONT></DIV>
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class=212011020-11052004><FONT color=#000000>Brandon Nichols,
PE, LEED<SUP><SPAN style="FONT-SIZE: 8pt">®</SPAN></SUP>
AP</FONT></SPAN></SPAN></DIV>
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<DIV><SPAN
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color=#000080><STRONG>HARGIS ENGINEERS</STRONG></FONT></DIV>
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<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Fred Porter<BR><B>Sent:</B>
Friday, October 12, 2007 10:23 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] Heat Pump
COP<BR></FONT><BR></DIV>
<DIV></DIV>Yes and no. The energy is "removed," but the COP improves because the
fan heat had a COP of 1.0, and is included in the rated gross kW in and Btuh
out. I think the T24 ACM may have a "method" or formula.<BR><BR><BR>
<HR>
<B>From: </B>Aulbach, John<BR><B>Sent: </B>Thu, 10/11/2007 3:25pm<BR><B>To:
</B>BLDG-SIM@gard.com<BR><B>Subject: </B>[BLDG-SIM] Heat Pump COP<BR><BR>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2>Folks:</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2>In eQuest, the Energy Input Ratio (EIR) can be derived from
EER or COP given for a unit or from a Standard. To correctly model such a unit,
one must subtract the fan energy for the unit to obtain the EER (EIR) of the
compressor only. This improves the input from, say, a COP of 12.3 to
15.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2>What about in the case of the heat pump heating COP? Must
one subtract out the fan energy here as well, thus "worsening" the COP for the
heating side?</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2>I cannot find anything written on this
subject.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2>Thanks.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=957342121-11102007>
<DIV align=left>
<DIV align=left><FONT color=#0000ff>John R. Aulbach, PE, CEM</FONT></DIV>
<DIV align=left><FONT face=Arial size=2><EM>Project Manager</EM></FONT></DIV>
<DIV align=left><FONT face=Arial size=2><FONT color=#0000ff>Nexant,
Inc</FONT>.</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>100 North Barranca, Suite
820</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>West Covina, CA 91791 USA</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Phone: 626-430-9054</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>Fax: 626-430-9060</FONT></DIV>
<DIV align=left><FONT face=Arial size=2>email: <A
title=mailto:jaulbach@nexant.com
href="mailto:jaulbach@nexant.com">jaulbach@nexant.com</A></FONT></DIV>
<DIV> </DIV></DIV></SPAN></DIV><PRE><DIV> </DIV><PRE>h@nexant.comYou received this e-mail because you are subscribed<BR>to the BLDG-SIM@GARD.COM mailing list. To unsubscribe<BR>from this mailing list send a blank message to<BR>BLDG-SIM-UNSUBSCRIBE@GARD.COM<BR></PRE>
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