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<DIV dir=ltr align=left><SPAN class=820241518-16102007><FONT color=#0000ff
size=2><FONT face=Arial>Thanks <SPAN
class=266365914-16102007>Xiaobing</SPAN></FONT></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=820241518-16102007><FONT face=Arial
color=#0000ff size=2><SPAN
class=266365914-16102007></SPAN></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=820241518-16102007><FONT face=Arial
color=#0000ff size=2><SPAN class=266365914-16102007>In reviewing some past heat
pump projects, I see that the way we have been doing it is in agreement with
modeling the supply fan separately, and using the manufacturer's published
EIR/COP values to compute the cooling/heating EIRs without adjustment.
</SPAN></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=820241518-16102007><FONT face=Arial
color=#0000ff size=2><SPAN
class=266365914-16102007></SPAN></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=820241518-16102007><FONT face=Arial
color=#0000ff size=2><SPAN class=266365914-16102007>A problem many of us
have in supervising modeling projects is backchecking...modifying manufacturer's
published data creates a variance in the documentation and backcheck processes
that needs to be addressed consistently for every project going forward.
Thus when modifying manufacturer's published heat pump EIR/COP values was
suggested to be necessary for LEED compliance, I wanted to go through
the <A
href="http://elcca-exchange.blogspot.com/2007/10/heat-pump-parametrics.html">justification
exercise</A> of why we generally don't.</SPAN></FONT></SPAN></DIV>
<DIV><FONT color=#0000ff size=2></FONT> </DIV>
<DIV><SPAN class=820241518-16102007><FONT face=Arial color=#0000ff size=2>Dead
horse beaten, as far as I'm concerned!</FONT></SPAN></DIV>
<DIV><SPAN class=820241518-16102007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=820241518-16102007><FONT face=Arial color=#0000ff
size=2>Brando</FONT></SPAN></DIV>
<DIV><SPAN class=820241518-16102007><FONT face="Courier New" color=#0000ff
size=2></FONT></SPAN> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<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>Xiaobing Liu<BR><B>Sent:</B>
Tuesday, October 16, 2007 9:12 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] Heat Pump
COP<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV><SPAN class=266365914-16102007><FONT face=Arial color=#0000ff
size=2>Brandon:</FONT></SPAN></DIV>
<DIV><SPAN class=266365914-16102007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=266365914-16102007><FONT face=Arial color=#0000ff size=2>Thanks
for your continuous effort to discuss the issue of heat pump COP and the fan
power. Just want to clarify several things cited in your
e-mails.</FONT></SPAN></DIV>
<DIV><SPAN class=266365914-16102007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=266365914-16102007><FONT face=Arial color=#0000ff size=2>1. The
fan power included in the EER/COP calculation may not be the same as the fan
actually demand when the heat pump runs. For water-source heat pumps,
ANSI/ARI/ASHRAE ISO Standard 13256-1:1998 (Water-source heat pumps - testing and
rating for performance - Part 1: Water-to-air and brine-to-air heat pump) states
following requirements for fan power input in COP/EER
calculations</FONT></SPAN></DIV>
<DIV><SPAN class=266365914-16102007><FONT size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=266365914-16102007><FONT size=2>4.1.2 </FONT><B><FONT
size=2>Power input of fans for heat pumps without duct<SPAN
class=266365914-16102007> </SPAN>connection</DIV>
<DIV></B></FONT><FONT size=2>
<P align=left>In the case of heat pumps which are not designed for duct<SPAN
class=266365914-16102007> </SPAN>connection and which are equipped with an
integral fan, all<SPAN class=266365914-16102007> </SPAN>power consumed by the
fans shall be included in the effective<SPAN class=266365914-16102007>
</SPAN>power input to the heat pump.</P></FONT><FONT size=2>
<P align=left>4.1.3 </FONT><B><FONT size=2>Power input of fans for heat pumps
with duct<SPAN class=266365914-16102007>
</SPAN>connection</P></B></FONT></SPAN></DIV>
<DIV><SPAN class=266365914-16102007><FONT size=2>
<P align=left>4.1.3.2 </FONT><FONT size=2>If a fan is an integral part of a heat
pump, <STRONG>only<SPAN class=266365914-16102007> </SPAN>the portion of the fan
power required to overcome the internal<SPAN class=266365914-16102007>
</SPAN>resistance shall be included in the effective power input to the<SPAN
class=266365914-16102007> </SPAN></STRONG><STRONG>heat pump</STRONG>. The
fraction which is to be excluded from the total<SPAN class=266365914-16102007>
</SPAN>power consumed by the fan shall be calculated using the following<SPAN
class=266365914-16102007> </SPAN>formula:<SPAN class=266365914-16102007> $B&U(B<FONT
size=1>fa = </FONT><FONT size=3>q x $B&$(B<FONT size=2><EM>p /
</EM></FONT></FONT><FONT size=3>$B&G(B</FONT></SPAN></P>
<P align=left>where</P></FONT><FONT size=2>
<P align=left>$B&U(B</FONT><FONT size=1>fa </FONT><FONT size=2>is the fan power
adjustment, in watts;</P></FONT><FONT size=2>
<P align=left>$B&G(B </FONT><FONT size=2>= 0.3 </FONT><FONT size=2>$B!_(B </FONT><FONT
size=2>10</FONT><FONT size=1>3 </FONT><FONT size=2>by
convention;</P></FONT><FONT size=2>
<P align=left>$B&$(B</FONT><FONT size=2><I>p </I>is the measured external static
pressure difference, in<SPAN class=266365914-16102007> </SPAN></FONT><FONT
size=2>pascals;</P></FONT><I><FONT size=2>
<P align=left>q </I></FONT><FONT size=2>is the nominal airflow rate, in litres
per second.</FONT></P>
<P align=left><FONT size=+0><STRONG><FONT size=2>This value shall be subtracted
from the heating capacity and<SPAN class=266365914-16102007> </SPAN>added to the
cooling capacity.</FONT></STRONG></P><FONT face=Arial color=#0000ff>
<DIV><SPAN class=266365914-16102007><FONT color=#0000ff><FONT
color=#000000><FONT face=Arial color=#0000ff size=2>The reason for this is that,
in a particular heat pump installation, depending on the air flow and
external static pressure of the duct work, the fan power is different, which is
unknown when the heat pump is tested in the lab. So, to isolate from the unknown
effect of the external duct work, <STRONG>only<SPAN class=266365914-16102007>
</SPAN>the portion of the fan power required to overcome the internal<SPAN
class=266365914-16102007> </SPAN>resistance shall be included in the effective
power input to the<SPAN class=266365914-16102007> </SPAN>heat pump</STRONG> if
the heat pump is designed for duct connection.</FONT></FONT></FONT></SPAN><SPAN
class=266365914-16102007> <FONT size=2>Therefore, the fan power in the real
operating condition should be specified in the simulation to more accurately
predict the fan energy consumption. </FONT></SPAN></DIV></FONT>
<P align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=266365914-16102007>2. The electric consumption of fan depends on not only
the fan power (which may be less than 10% of the compressor power) but also the
<STRONG>run time</STRONG> of the fan. In the case of mild climate, if fan runs
continuously (to provide OA and air circulation in the conditioned space), the
electric consumed by fan may be higher than the compressor power since fan runs
8760 hours a year but the cumulative run time of compressor over a year may be
less than 1000 hours. Whether the fan power play an important role in energy
analysis does not necessarily depends on the size of heat pump, it depends on
what the system is (i.e. single small heat pump or multiple small heat pumps
connected with a water loop) and how the indoor fan of the heat
pump is operated (continuous or intermittently). For this reason, it is
recommended to use DOAS for WLHP system so that the indoor fan of the heat pump
can run intermittently to take care the space loads while the DOAS delivers the
required amount of OA to the space.</SPAN></FONT></P>
<P align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=266365914-16102007>Hope it helps,</SPAN></FONT></P>
<P align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=266365914-16102007>Xiaobing</SPAN></FONT></P></FONT></SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com]<B>On Behalf Of </B>Brandon Nichols<BR><B>Sent:</B>
Tuesday, October 16, 2007 12:54 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] Heat Pump
COP<BR><BR></FONT></DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2>OK All, </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2>Has anyone looked at <A
href="http://www.eere.energy.gov/buildings/appliance_standards/residential/pdfs/cac_tp_101105.pdf">this
lovely document</A>, which is the Department of Energy's test procedure
for air conditioners and heat pumps to determine EER and SEER? To
this I turned to answer the burning question "what is the standard
external fan static pressure drop specified to calculate EER and
SEER?"</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2>Seems to me after wading
through the swamp of equations in the back of the document that fan
energy in EER and SEER calculations is specified at a 0.05 inch external
static pressure drop.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2>So then I started digging around for
data to support my intuitive feeling that fan energy is going to be something
like 1/10th that of compressor energy on small heat
pumps.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2>In the process I ran across this
nifty <A href="http://www.ornl.gov/~wlj/hpdm/doehpdm.shtml">DOE/ORNL Heat
Pump Design Model</A>. Now we're cooking... see <A
href="http://elcca-exchange.blogspot.com/2007/10/heat-pump-parametrics.html">this
post</A> for a 3D plot of parametric runs (did I say 'nifty'?),
varying supply airflow and static pressure, from 600 to 4200 and 0.05 to 0.65
respectively.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2>I'm standing by my assertion that
supply fan energy does not need to be subtracted from heat pump EER as SEER
and the new number recalculated -- playing those kinds of games can lead
to an exercise in futility.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2><A
href="http://www.ornl.gov/~wlj/hpdm/doehpdm.shtml"></A></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=945231004-16102007><FONT
face="Courier New" color=#0000ff size=2>Best regards,</FONT></SPAN></DIV>
<DIV> </DIV>
<DIV align=left>
<DIV align=left><FONT face=Arial size=2></FONT> </DIV><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT color=#000000>Brandon Nichols,
PE, LEED<SUP><SPAN style="FONT-SIZE: 8pt">®</SPAN></SUP>
AP</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004><FONT
color=#000000>Mechanical</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#000080><STRONG>HARGIS ENGINEERS</STRONG></FONT></DIV>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>600 Stewart Street</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>Suite 1000</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>Seattle, WA 98101<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151>www.hargis.biz<o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><FONT
color=#515151> <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">d
|</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt">
206.436.04<SPAN class=212011020-11052004>0</SPAN>0<SPAN
style="mso-spacerun: yes"> </SPAN><B>c | </B>206.<SPAN
class=212011020-11052004>228.8707</SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt"><SPAN
class=212011020-11052004></SPAN></SPAN><FONT color=#515151><B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">o
|</SPAN></B><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">
206.448.3376<SPAN style="mso-spacerun: yes"> </SPAN><B>f <SPAN
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206.448.4450</SPAN></FONT></P></SPAN></SPAN>
<DIV> </DIV></DIV>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> Fred Porter
[mailto:fporter@archenergy.com] <BR><B>Sent:</B> Friday, October 12, 2007 5:22
PM<BR><B>To:</B> BLDG-SIM; Brandon Nichols<BR><B>Subject:</B> RE: [BLDG-SIM]
Heat Pump COP<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=TT12B7o00 size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: TT12B7o00">G3.1.2.1
</SPAN></FONT><B><FONT size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt">Equipment Efficiencies.
</SPAN></FONT></B><FONT size=2><SPAN style="FONT-SIZE: 10pt">All HVAC
equipment</SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">in the <I><SPAN style="FONT-STYLE: italic">baseline
building design </SPAN></I>shall be modeled at the
minimum<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><I><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt; FONT-STYLE: italic">efficiency </SPAN></FONT></I><FONT
size=2><SPAN style="FONT-SIZE: 10pt">levels, both part load and full load, in
accordance<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">with Section 6.4. Where <I><SPAN
style="FONT-STYLE: italic">efficiency </SPAN></I>ratings, such as
EER<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">and COP, include fan energy, the descriptor shall be
broken<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">down into its components so that supply fan energy can
be<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">modeled separately.<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt"><o:p> </o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=TT12B7o00 size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: TT12B7o00">G3.1.2.4
</SPAN></FONT><B><FONT size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt">Fan System Operation.
</SPAN></FONT></B><FONT size=2><SPAN style="FONT-SIZE: 10pt">Supply and return
fans<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">shall operate continuously whenever spaces are
occupied and<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">shall be cycled to meet heating and cooling loads
during unoccupied<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">hours. If the supply fan is modeled as cycling and
fan<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">energy is included in the energy-efficiency rating of
the equipment,<o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">fan energy shall not be modeled
explicitly.</SPAN></FONT><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT>
</P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT>
</P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">--</SPAN></FONT><FONT
color=navy><SPAN style="COLOR: navy"><o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Fred
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"><o:p> </o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"> </SPAN></FONT><o:p></o:p>
</P></DIV>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> Brandon
Nichols [mailto:BrandonN@Hargis.biz] <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, October 12, 2007 6:14
PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Fred Porter;
BLDG-SIM@gard.com<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
RE: [BLDG-SIM] Heat Pump COP</SPAN></FONT><o:p></o:p> </P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Courier New" color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Courier New'">Good
point Fred, for larger unitary packages and for dialing-in energy savings
rebate studies. I did say 'arguably', and yours is an insightful
observation. Scanned all 90.1-2004 but didn't see the reference you
alluded to -- if you can be more specific please
advise.</SPAN></FONT><o:p></o:p> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Courier New" color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Courier New'">Given the
small heatpumps my firm is accustomed to installing, coupled with the fuzzy
level of design at which we're doing our preliminary energy studies, the
simplification of discounting fan operation when compressors aren't running I
think is well within the error bars of the overall
study.</SPAN></FONT><o:p></o:p> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Courier New" color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Courier New'">Which doesn't
provide any comfort from the realization that this business gives one plenty
of cause to ask where picking the theoretical flyspecs out of
manufacturer's published pepper has crossed a threshold of mind-numbingly
diminished returns!</SPAN></FONT><o:p></o:p> </P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT> </P>
<P class=MsoNormal><FONT face="Courier New" color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Courier New'">Regards
</SPAN></FONT><o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT> </P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Brandon Nichols,
PE, LEED</SPAN></FONT><SUP><FONT face=Arial color=black size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: black; FONT-FAMILY: Arial">®</SPAN></FONT></SUP><FONT
face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">
AP</SPAN></FONT><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT>
</P></DIV>
<DIV>
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<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT> </P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT> </P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT> </P>
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face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><FONT face=Tahoma
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
BLDG-SIM@gard.com [mailto:BLDG-SIM@gard.com] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Fred Porter<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, October 12, 2007 3:31
PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
BLDG-SIM@gard.com<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
[BLDG-SIM] Heat Pump COP</SPAN></FONT><o:p></o:p> </P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The method cited
below only gives correct results if the heat pump fan operates intermittently
on a call for heat/cool, and if the fan as installed runs at its ARI-tested
power. Otherwise this method greatly under-estimates fan energy, at least for
constant speed fans. This is mentioned specifically for App G/ECB models
either in the Standard itself or in the UM.</SPAN></FONT> <FONT face=Arial
color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT>
</P>
<DIV>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">--</SPAN></FONT>
<FONT color=navy><SPAN style="COLOR: navy"><o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Fred
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=navy size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: navy"> </SPAN></FONT>
<o:p></o:p></P></DIV>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"> Brandon
Nichols [mailto:BrandonN@Hargis.biz] <BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, October 12, 2007 3:47
PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> Fred Porter;
BLDG-SIM@gard.com<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
RE: [BLDG-SIM] Heat Pump COP</SPAN></FONT> <o:p></o:p></P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT> </P>
<H5 style="MARGIN: 0in 0in 0pt"><B><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt"> <o:p></o:p></SPAN></FONT></B></H5>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" color=blue size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: blue">Good point, John -- but there
may be an arguably easier way to not double-count fan energy...following
is a reprint from the DOE2 documentation:</SPAN></FONT> <o:p></o:p></P></DIV>
<H5 style="MARGIN: 0in 0in 0pt"><B><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt"> <o:p></o:p></SPAN></FONT></B></H5>
<H5 style="MARGIN: 0in 0in 0pt"><B><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">COOLING-EIR <o:p></o:p></SPAN></FONT></B></H5>
<P class=MsoBodyText style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">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.
<o:p></o:p></SPAN></FONT></P>
<P class=MsoBodyText style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">Note: If you include fan electric
energy consumption in your value of COOLING-EIR, then you should <FONT
color=red><SPAN style="COLOR: red">set</SPAN></FONT> <FONT color=red><SPAN
style="COLOR: red">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.</SPAN></FONT> For commercial systems the default value
of COOLING-EIR includes compressor and outdoor fan energy, but not indoor fan
energy. <o:p></o:p></SPAN></FONT></P>
<DIV>
<H5><B><FONT face="Times New Roman" size=2><SPAN
style="FONT-SIZE: 10pt">HEATING-EIR <o:p></o:p></SPAN></FONT></B></H5>
<P class=MsoBodyText><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">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><B><FONT
face="Times New Roman" color=red><SPAN
style="COLOR: red">program-calculated</SPAN></FONT></B></STRONG> HEATING-EIR
does not include fan power and heat. This keyword is appropriate only to HP,
RESYS, and PTAC systems. <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" color=blue size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: blue">Mysteriously, the HEATING-EIR
documentation makes no mention of the fan energy double counting issue.
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, and zero-out the supply fan energy as described in the
documentaion ... then Bob's your uncle, right?
</SPAN></FONT><o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" color=blue size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: blue">FWIW, that's the way we do
it...</SPAN></FONT> <o:p></o:p></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Brandon Nichols,
PE, LEED</SPAN></FONT><SUP><FONT face=Arial color=black size=1><SPAN
style="FONT-SIZE: 8pt; COLOR: black; FONT-FAMILY: Arial">®</SPAN></FONT></SUP><FONT
face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial"> AP</SPAN></FONT>
<FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face=Arial color=black size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: black; FONT-FAMILY: Arial">Mechanical</SPAN></FONT>
<FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
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<B><SPAN style="FONT-WEIGHT: bold">f |</SPAN></B>
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<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P></DIV>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT> </P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<P class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><FONT face=Tahoma
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
BLDG-SIM@gard.com [mailto:BLDG-SIM@gard.com] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Fred Porter<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Friday, October 12, 2007 10:23
AM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
BLDG-SIM@gard.com<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
[BLDG-SIM] Heat Pump COP</SPAN></FONT> <o:p></o:p></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">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.<o:p></o:p></SPAN></FONT> </P>
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<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><FONT face="Times New Roman"
size=3><SPAN style="FONT-WEIGHT: bold; FONT-SIZE: 12pt">From:
</SPAN></FONT></B>Aulbach, John<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:
</SPAN></B>Thu, 10/11/2007 3:25pm<BR><B><SPAN style="FONT-WEIGHT: bold">To:
</SPAN></B>BLDG-SIM@gard.com<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:
</SPAN></B>[BLDG-SIM] Heat Pump COP <o:p></o:p></P>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Folks:</SPAN></FONT>
<o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">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.</SPAN></FONT> <o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">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?</SPAN></FONT>
<o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">I cannot find
anything written on this subject.</SPAN></FONT> <o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Thanks.</SPAN></FONT>
<o:p></o:p></P>
<P class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face="Times New Roman" color=blue size=3><SPAN
style="FONT-SIZE: 12pt; COLOR: blue">John R. Aulbach, PE, CEM</SPAN></FONT>
<o:p></o:p></P>
<P class=MsoNormal><EM><I><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Project
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<P class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
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