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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Gaurav,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Addressing your first question with eQuest is a difficult
task. First off, if you don’t have Climate Master’s
GSHP eQuest “expansion pack,” get it (<a
href="http://www.climatemaster.com/index/equest">http://www.climatemaster.com/index/equest</a>).
It adds many GSHP modeling functions, including DHW, which would accurately
capture your DHW energy requirements. I think this still requires a
dedicated HP to supply DHW. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The real difficulty arises when you plan on using a single HP
unit to supply both radiant heating and DHW since there are no commercially
available HP’s (that I’m aware of) that will operate the
desuperheater option without a call for radiant heating. Obviously, in
situations where no radiant heating call exists, you run the risk of quickly
exhausting your DHW supply (unless you have auxiliary heating). A
practical solution to this involves using an Indirect Hot Water tank as your
radiant buffer tank. Kudos if you can figure out a way to model the
latter!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Anthony Hardman<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>Mechanical Engineer<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";
color:#9BBB59'>Geo-Energy Services<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
bldg-sim-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>gaurav
mehta<br>
<b>Sent:</b> Monday, January 07, 2008 1:30 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] eQuest: Ground Source Heat Pump + DHW + Glazing<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal>Hi,<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>I have two questions:<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>1. I am modeling a single family residential building
in the pacific Northwest with a Ground Source Heat Pump which apart from
providing hot water for the radiant slabs also provides heating for domestic
hot water (DHW). How does one model DHW in this situation? I have calculated
the flow rate (gpm) required for the house and have an annual schedule. I tried
to assign a process load to the Water Loop HP and when i modeled one case with
the process load and the the other without the process load the difference in
the pump energy does not confirm to the hand calculation. <o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>2. This question is independent of the first one (ie no
process load attached to the Water Loop HP). I modeled one case with double
low e glazing on all orientations and the other case had South facing glazing
changed to double clear and rest of orientations with the same double low e
glazing. Both the glazing types were modeled using the library method. The
difference in the results show a penalty of 2% in space heating for the case
with South facing glazing changed to double clear. Understandable, the
building configuration (amount of glazing + shading) is such
that insulating property of glazing provides more benefit than solar penetration.
However, I also note there is a penalty of 11% for the pump energy. There is no
daylighting and nothing different in the two models accept the South facing
with different glazing. There is no cooling modeled for the house as well and
hence no difference in that end use as well. I can understand some increase in
pump energy, but can anyone provide some insight as to why such an impact on
pump energy? <o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal>I would greatly appreciate your response.<o:p></o:p></p>
</div>
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<p class=MsoNormal> <o:p></o:p></p>
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<div>
<p class=MsoNormal>Thanks.<o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<div>
<p class=MsoNormal>Gaurav<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Sustainable Building Analyst,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal>Stantec<o:p></o:p></p>
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