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<title>Space Cooling Energy Consumption with GSHP</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Good morning,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I am having similar results with a
ground-coupled heat pump and am following this thread closely. I am only
realizing savings of about 5% to 10% over an air-source HP.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I believe I am incorrectly separating out
the fan-energy on the air-source units. What is the procedure for getting the fan
and compressor energy separate on the air-source units (12 SEER air-source unit
per 90.1-2004, baseline design)? If I understand correctly, the GCHP efficiency
stated under ARI 13256 does not include external fan energy or external pump
energy, and therefore, the stated GCHP efficiency can be converted into EIR
directly. Correct? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Also, for the GCHP the correct number to
use is the “GLHP EER” value from the manufacturer based on ARI
13256, which is higher than the water-loop HP (WLHP) ARI EER? Is that correct?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Experience tells me a GCHP should realize
more savings than what I am getting, which leads me to believe I am inputting “garbage”
into the model. Thanks for your help!<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><em><b><i><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy;font-weight:bold'>Adam
Young</span></font></i></b></em><font color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Demba Ndiaye<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, May 14, 2008 8:05
AM<br>
<b><span style='font-weight:bold'>To:</span></b> Tom Butler;
bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [Bldg-sim] Space
Cooling Energy Consumption with GSHP</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thomas, <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>You should definitively have more savings
than that, even if there is the pump energy. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>One first thing to check: the efficiency
of GSHP should be much higher than that of air-source heat pumps in both
heating and cooling modes. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>______________</span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><st1:PersonName w:st="on"><font size=2 color=navy
face=Arial><span style='font-size:10.0pt;font-family:Arial;color:navy'>Demba
Ndiaye</span></font></st1:PersonName><o:p></o:p></p>
</div>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Tom Butler<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, May 13, 2008 5:53
PM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@lists.onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] Space Cooling
Energy Consumption with GSHP</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
am modeling an apartment style dormitory for a project in <st1:place w:st="on"><st1:City
w:st="on">Atlanta</st1:City>, <st1:State w:st="on">GA.</st1:State></st1:place>
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. </span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>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.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Has
any one encountered this issue? </span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks</span></font>
<o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>tb </span></font><o:p></o:p></p>
<p><b><font size=3 color=black face=Garamond><span style='font-size:12.0pt;
font-family:Garamond;color:black;font-weight:bold'>Thomas Butler,</span></font></b>
<font color=black face=Garamond><span style='font-family:Garamond;color:black'>LEED
AP</span></font><b><span style='font-weight:bold'> </span></b><br>
<font color=black face=Garamond><span style='font-family:Garamond;color:black'>Direct
Phone 404-253-1435 | Direct Fax 404-253-1335</span></font> <o:p></o:p></p>
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