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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'>Ramana, <o:p></o:p></span></font></p>
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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 seem to have a problem of loop under-sizing:
try to increase the number of wells.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
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<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>
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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>Ramana Koti<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, May 14, 2008
12:13 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] eQUEST -
percent of hours outside throttling range</span></font><o:p></o:p></p>
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<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=3 face="Times New Roman"><span style='font-size:
12.0pt'>Dear all,<br>
<br>
I'm working on the energy model for a school building with 43 zones with each
zone connected to a ground source heat pump. Right now the model is for design
development but eventually the same model could be used for LEED.<br>
<br>
I can't seem to get the percent of hours any system zone outside of throttling
range below 48%. The system sizing ratio of all airside systems is currently at
2. As per HVAC design, the depth of ground source loop is 400 ft and I tried
increasing it to 600 ft and that only helps a little.<br>
<br>
In the SS-R report, the undercooled hours for different zones are in the 200+
range while the underheated hours are in the range of 200 to 500. I'm using the
<st1:place w:st="on"><st1:City w:st="on">Dodge City</st1:City>, <st1:State
w:st="on">KS</st1:State></st1:place> weather file.<br>
<br>
Also the current annual energy consumption is as low as 18.1 kBtu/ft2, I know
that will change as the % hours outside the throttling range changes but still
seems very low.<br>
<br>
Thanks for your help,<br>
<br>
RAMANA KOTI Assoc. ASHRAE LEED® AP <br>
Sustainable Building Analyst<br>
<br>
ELEMENTS division of BNIM architects<br>
<st1:Street w:st="on"><st1:address w:st="on">106 West 14th Street Suite 200</st1:address></st1:Street><br>
<st1:place w:st="on"><st1:City w:st="on">Kansas City</st1:City> <st1:State
w:st="on">Missouri</st1:State> <st1:PostalCode w:st="on">64105</st1:PostalCode></st1:place><br>
<br>
d 816.783.1635 f 816.783.1501<br>
<a href="http://bnim.com">bnim.com</a> | <a href="http://elements.bnim.com">elements.bnim.com</a>
<o:p></o:p></span></font></p>
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