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<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff
size=2>Karen:</FONT></SPAN></DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff size=2>If you
create a heat pump system using eQUEST wizard, in the first screen of the wizard
system (after you specifying both cooling and heating equipment as "DX Coil"),
an additional input entry will appear and ask you specify the source of the heat
pump. The available options include "Air", "Water Loop", and "Ground Loop". When
"Water Loop" is selected, the HVAC system will be defined a water loop heat pump
(WLHP) system (with boiler and cooling tower); When "Ground Loop" is selected,
the HVAC system will be defined as a ground source heat pump (GSHP) system that
uses water-to-air heat pumps connected to a common (water) loop and a vertical
borehole field as heat sink and source.</FONT></SPAN></DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff size=2>I'm
not clear why you have to deal with HIR for WLHP and GSHP systems since these
heat pumps are electric-driven. I guess you were talking about the EIR instead
of HIR.</FONT></SPAN></DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff size=2>The
PVVT is used to simulate the air side of a water-to-air heat pump so that it can
account for the recent developments of water-to-air heat pump, such as the usage
of staged compressor, variable speed fan, etc. If the WLHP/GSHP is created
with the eQUEST wizard, parameters associated with the PVVT system will be
automatically set for constant air flow, and default WLHP/GSHP heat pump
performance curves will be used. The default curves are normalized at the ARI
rating conditions for "ground loop" application (77F EFT for cooling and 32F EFT
for heating). If the WSHP/GSHP is created in detailed mode, at this version of
eQUEST, the user has to adjust the parameters of PVVT to fit for the
specific heat pumps being simulated. I've listed some necessary adjustments
for the parameters of PVVT in my earlier post to the topic "Gshp in detailed
edit mode".</FONT></SPAN></DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff size=2>FYI, a
performance data/curve library for all the water-to-air heat pumps of a
major water-source heat pump manufacturer has been built and, as an add-on
feature of eQUEST, it can be accessed directly from the wizard of "Packaged
Equipment" if either WLHP or GSHP is specified. Please let me know if you are
interested in the library and this add-on feature.</FONT></SPAN></DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff size=2>Hope
it helps in your simulation.</FONT></SPAN></DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=643084420-06082007><FONT face=Arial color=#0000ff
size=2>Xiaobing</FONT></SPAN></DIV>
<BLOCKQUOTE>
<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>Karen Walkerman<BR><B>Sent:</B>
Monday, August 06, 2007 2:57 PM<BR><B>To:</B> BLDG-SIM@gard.com<BR><B>Cc:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] Trouble with Heat Pumps
(eQuest)<BR><BR></FONT></DIV>
<DIV>Thanks for all the responses. I think I figured it out:</DIV>
<DIV> </DIV>
<DIV>When you choose "WLHP" in the eQuest Wizard, it creates a PVVT system
with a GSHP. The curve used to adjust HIR is based on a few data points,
and did not perform very well at the temperatures I was using. A
straight HP system selected in detailed edit mode did much better. I now
realize that this is because the HIR curve was better for my purposes. I
have now created curves based on the heat pumps spec'd for this job and the
numbers are making more sense. </DIV>
<DIV> </DIV>
<DIV>Thanks again for all the repsonses, thought I'd let everyone know,
especially because PVVT is what is selected when you create a WLHP system with
the wizard, and may need some detailed data edit tweaking.</DIV>
<DIV> </DIV>
<DIV>~Karen~<BR><BR> </DIV>
<DIV><SPAN class=gmail_quote>On 8/6/07, <B class=gmail_sendername>Brandon
Nichols</B> <<A
href="mailto:BrandonN@hargis.biz">BrandonN@hargis.biz</A>> wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<DIV>
<DIV><SPAN class=e id=q_1143caa839ded31b_1>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2>Hello Karen,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2>"When so many things can go wrong, almost certainly more than one of
them will go wrong at the same time" ... or something like that, according
to Murphy. Recently I have been wrestling with a large heat pump
system, and may be able to help a little. </FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2>Have you adjusted your heat pomp efficiencies? Ground and
water source heat pumps will have different efficiencies, if for no other
reason than they are operating with different condenser water temperatures.
</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2>Check this post...</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2><A onclick="return top.js.OpenExtLink(window,event,this)"
href="http://elcca-exchange.blogspot.com/2007/03/ground-water-source-heat-pumps.html"
target=_blank>http://elcca-exchange.blogspot.com/2007/03/ground-water-source-heat-pumps.html</A></FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2>Next suspect, schedules... don't have a post for that yet, let me
know the effect of efficiency adjustments and we'll go from there.
</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN><FONT face="Courier New" color=#0000ff
size=2>Regards</FONT></SPAN></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV align=left><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial"><SPAN><FONT
color=#000000>Brandon Nichols, PE</FONT></SPAN></SPAN></DIV>
<DIV><SPAN
style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial"><SPAN><FONT
color=#000000>Mechanical</FONT></SPAN></SPAN></DIV>
<DIV><SPAN style="FONT-SIZE: 10pt; COLOR: gray; FONT-FAMILY: Arial"><FONT
color=#000080><STRONG>HARGIS ENGINEERS</STRONG></FONT></SPAN></DIV>
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color=#515151>600 Stewart Street</FONT></SPAN></P>
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<DIV> </DIV></DIV>
<DIV> </DIV><BR>
<DIV lang=en-us dir=ltr align=left>
<HR>
<FONT face=Tahoma size=2><B>From:</B> <A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:BLDG-SIM@gard.com" target=_blank>BLDG-SIM@gard.com</A>
[mailto:<A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:BLDG-SIM@gard.com" target=_blank> BLDG-SIM@gard.com</A>] <B>On
Behalf Of </B>Karen Walkerman<BR><B>Sent:</B> Friday, August 03, 2007 5:20
PM<BR><B>To:</B> <A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:BLDG-SIM@gard.com"
target=_blank>BLDG-SIM@gard.com</A><BR><B>Subject:</B> [BLDG-SIM] Trouble
with Heat Pumps (eQuest)<BR></FONT><BR> </DIV>
<DIV></DIV>
<DIV>I apologize for all the emails I've sent out as of late. Thanks
for all the input.</DIV>
<DIV> </DIV>
<DIV>I have another:</DIV>
<DIV> </DIV>
<DIV>I'm comparing a ground source heat pump to a heat pump loop with
chiller and boiler. Trouble is, when I switch systems, the energy used
by the heat pump to heat the space goes down only slightly as compared to
the energy input by the boiler. My loop temperatures change between
the systems (from heating temp of 40 F to 70 F), and COP rises
accordingly. Right now the energy use of the two systems is off by
about 85%!! </DIV>
<DIV> </DIV>
<DIV>Energy use for straight electric resistance heat is about the same
as the electric use for a heat pump system. This is for a baseline
model with 18% evenly distributed windows, R-19 batt insulation, R-38
ceilings, etc. </DIV>
<DIV> </DIV>
<DIV>I used the wizard to set up the equipment for all runs (I'm also having
trouble in detailed edit mode). The water loop and the heat pump don't
seem to be talking to one another. Can anyone help?</DIV>
<DIV> </DIV>
<DIV>Thanks,</DIV>
<DIV><BR clear=all><BR>-- <BR>Karen Walkerman<BR>Second Law
Consulting<BR>802-238-0980<BR><A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:kwalkerman@gmail.com" target=_blank>kwalkerman@gmail.com
</A></DIV></SPAN></DIV><PRE>You received this e-mail because you are subscribed
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</PRE></DIV></BLOCKQUOTE></DIV><BR><BR clear=all><BR>-- <BR>Karen
Walkerman<BR>Second Law Consulting<BR>802-238-0980<BR><A
href="mailto:kwalkerman@gmail.com">kwalkerman@gmail.com</A>
</BLOCKQUOTE><PRE>
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