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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'>Robby,<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'>This is a typical, real world issue with heat
pumps. We typically advise owners not to use an aggressive night setback (more
than 2 or 3 degrees) because of this exact problem. We usually have a control
sequence put in place that limits the night setback if the outdoor air
temperature falls below a certain level (say 30 degF). Can you apply for a
variance under the local building code? If this is how the building will be
operated in real life with a 15 degree setback, you will probably get too cold
complaints from the occupants.<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'>One way around the modeling problem would
be to use perimeter baseboard in the model. I would set it to electric, and
schedule the baseboard to only to be available during the morning warm-up
period. It shouldn’t add too much energy into you model and will
eliminate most of your unmet load hours.<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'>Good luck!<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'>Jon Evans, PE</span></font><font
color=navy><span style='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'><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'>Sustainable Engineering Group LLC</span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><U1:ADDRESS u2:st="on"><U1:STREET u2:st="on"><st1:Street
w:st="on"><st1:address w:st="on"><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>431 Charmany Drive
Suite 102</span></font></st1:address></st1:Street></U1:STREET></U1:ADDRESS><font
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w:st="on"><st1:City w:st="on"><font size=2 color=navy face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:navy'>Madison</span></font></st1:City><font
size=2 color=navy face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:navy'>, <U1:STATE u2:st="on"><st1:State w:st="on">WI</U1:STATE></st1:State>
<U1:POSTALCODE u2:st="on"><st1:PostalCode w:st="on">53719</U1:POSTALCODE></st1:PostalCode></span></font></st1:place><font
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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'>Tel: (608) 231 9664</span></font><font
color=navy><span style='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'>Fax: (608) 231 9665</span></font><font
color=navy><span style='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'><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'>E-mail: <a
href="mailto:jevans@sustaineng.com">jevans@sustaineng.com</a> <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'>Web: <a href="http://www.sustaineng.com/"
title="http://www.sustaineng.com/">www.sustaineng.com</a></span></font><font
color=navy><span style='color:navy'><o:p></o:p></span></font></p>
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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'><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'> Robby Oylear
[mailto:robbyo@rushingco.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Thursday, May 22, 2008 10:13
AM<br>
<b><span style='font-weight:bold'>To:</span></b> bldg-sim@onebuilding.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> [Bldg-sim] eQUEST GSHP
Unmet Load Hours</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 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi everyone,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I’m trying to model a ground source heat pump system
in eQUEST using a Water Loop Heat Pump system attached to a ground source heat
exchanger. The system seems to work fine during occupied hour but it just
can’t meet morning warm-up loads. I’m doing a systems energy
analysis for our local energy code compliance and there is a mandatory night
setback of 55 °F from 70 °F in heating. During winter months the system
doesn’t seem to be able to jump from 55 °F to 70 °F space temperature in
less than 1-2 hours. I’ve double checked the fan schedules and the
system is allowed to come on during this time. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Does anyone have any suggestions for getting the system to
meet these unmet load hours? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Franklin Gothic Demi"><span
style='font-size:12.0pt;font-family:"Franklin Gothic Demi"'>Robby Oylear</span></font><font
size=2 face="Franklin Gothic Demi"><span style='font-size:11.0pt;font-family:
"Franklin Gothic Demi"'><o:p></o:p></span></font></p>
<p class=MsoNormal><i><font size=2 face="Times New Roman"><span
style='font-size:10.0pt;font-style:italic'>Mechanical Engineer<o:p></o:p></span></font></i></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'>direct: 206.788.4571<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face="Times New Roman"><span style='font-size:
10.0pt'>cell: 206.354.2721</span></font><o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:3.0pt'><font size=1 face=Arial><span
style='font-size:8.0pt;font-family:Arial'><a href="http://www.rushingco.com"
title="blocked::http://www.rushingco.com/"><font color=black><span
style='color:windowtext;text-decoration:none'><span
title="blocked::http://www.rushingco.com/">www.rushingco.com</span></span></font></a><o:p></o:p></span></font></p>
<p class=MsoNormal style='margin-bottom:3.0pt'><font size=1 face=Arial><span
style='font-size:8.0pt;font-family:Arial'><img border=0 width=95 height=41
id="_x0000_i1025" src="cid:image001.jpg@01C8BC22.E5A0F4E0"><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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