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<DIV><SPAN class=796091314-20102008><FONT face=Arial color=#0000ff size=2>The
comparison also depends on climate condition (mild winter?) and building type
and zoning pattern (potential for recovering heat among different zones?). If
you use air source heat pump, check the defrosting control, winter shut-off
temperature set point, etc. Make sure the operation of the simulated air source
heat pump is realistic.</FONT></SPAN></DIV>
<DIV><SPAN class=796091314-20102008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=796091314-20102008><FONT face=Arial color=#0000ff
size=2>Xiaobing</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-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org]<B>On Behalf Of </B>Chris
Mullinax<BR><B>Sent:</B> Monday, October 20, 2008 7:52 AM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [Bldg-sim]
WSHP<BR><BR></FONT></DIV>
<DIV class=Section1>
<P class=MsoNormal>On three or four occasions I have used equest to compare
traditional, small split systems (three to five ton) to a water source heat
pump system in the same building. The WSHP system uses a cooling tower
and a small boiler. <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I tried to make everything else identical by creating the
first model and saving a copy of that model and changing the HVAC type from
split system to WSHP.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>On every occasion, split systems end up using significantly
less energy than water source heat pumps systems.<o:p></o:p></P>
<P class=MsoNormal>The WSHPs are typically 16 SEER, the Splits 13
SEER.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I know there is additional energy associated with pumps and
cooling towers. Is this a typical result? <o:p></o:p></P>
<P class=MsoNormal>It seems I've heard a lot of high about the efficiency of
water source heat pumps.<o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Thanks,</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Chris Mullinax,
P.E. <SPAN style="COLOR: #00b050">LEED AP</SPAN></SPAN><o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">pn:
770-387-1334</SPAN><o:p></o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">fx:
770-387-1383</SPAN><o:p></o:p></P>
<P class=MsoNormal><A href="mailto:chris@mullinaxsolutions.com"><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">chris@mullinaxsolutions.com</SPAN></A><o:p></o:p></P>
<P class=MsoNormal><A href="http://www.mullinaxsolutions.com"><SPAN
style="COLOR: blue">www.mullinaxsolutions.com</SPAN></A><o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><o:p> </o:p></P></DIV></BLOCKQUOTE></BODY></HTML>