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<TITLE>Space Cooling Energy Consumption with GSHP</TITLE>
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<DIV><SPAN class=186375621-13052008><FONT face=Arial color=#0000ff
size=2>Thomas:</FONT></SPAN></DIV>
<DIV><SPAN class=186375621-13052008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=186375621-13052008><FONT face=Arial color=#0000ff size=2>Does
the simulated dorm operate 24 hours? What efficiency you specified for GSHP?
What is the loop temperature in heating and cooling? Have you checked the pump
related input and defaults?</FONT></SPAN></DIV>
<DIV><SPAN class=186375621-13052008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=186375621-13052008><FONT face=Arial color=#0000ff size=2>There
are lots of thing can affect the results.</FONT></SPAN></DIV>
<DIV><SPAN class=186375621-13052008><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=186375621-13052008><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-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org]<B>On Behalf Of </B>Tom
Butler<BR><B>Sent:</B> Tuesday, May 13, 2008 4:53 PM<BR><B>To:</B>
bldg-sim@lists.onebuilding.org<BR><B>Subject:</B> [Bldg-sim] Space Cooling
Energy Consumption with GSHP<BR><BR></FONT></DIV><!-- Converted from text/rtf format -->
<P><FONT face=Arial size=2>I am modeling an apartment style dormitory for a
project in Atlanta, GA. Each of the 45 units is served by its own heat pump,
along with a few zones for public areas. For an energy efficiency grant
application I have compared the designed system, a ground source heat pump,
with an air source heat pump prescribed by 90.1. Other than the systems, the
models are identical. </FONT></P>
<P><FONT face=Arial size=2>The energy use for space cooling is significantly
higher for the GSHP system (24,000 kWh vs. 17,000 kWh). Because the power
required to run pumps offsets the savings in heating energy, this destroys the
rationale for spending the extra money on the Ground Source Heat Pump, as well
as our chances of receiving the grant.</FONT></P>
<P><FONT face=Arial size=2>Has any one encountered this issue? </FONT></P><BR>
<P><FONT face=Arial size=2>Thanks</FONT> </P>
<P><FONT face=Arial size=2>tb </FONT></P>
<P><B><FONT face=Garamond color=#000000>Thomas Butler,</FONT></B> <FONT
face=Garamond color=#000000>LEED AP</FONT><B> </B><BR><FONT face=Garamond
color=#000000>Direct Phone 404-253-1435 | Direct Fax 404-253-1335</FONT> </P>
<P><B><FONT face=Garamond color=#800000>L</FONT><FONT face=Garamond
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