<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Adam:</DIV>
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<DIV>How do you vary flow for a VFD is you aren't varying flow?</DIV>
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<DIV>And how do you get the air to 110°F if you are leaving the "hot deck" at 80°F?</DIV>
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<DIV>What did you change in the proposed model over the base model?</DIV>
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<DIV>An .INP and .PD2 file of each would be helpful.</DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Adam Gonthier <agonthier@Horizon-Engineering.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> equest-users@lists.onebuilding.org; bldg-sim@lists.onebuilding.org; Vidya Gowda <vgowda@Horizon-Engineering.com><BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Thu, July 29, 2010 1:21:44 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [Equest-users] PSZ Very High Unmet Hours<BR></FONT><BR>
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<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">Dear eQuest users, </SPAN></FONT></P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">I am having some difficulty with a project I am working on, and I was hoping I could receive some help or any information on a building a with packaged single zone units with DX cooling and hot water coils for heating, with a VFD to vary the supply flow (there are no VAV boxes in the system, and the supply reacts to overall building pressure rather than specific zonal needs determined by pressure sensors in the ductwork). There is no reheat in the system either. </SPAN></FONT></P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">It is a LEED for schools project where the simulation of the proposed model shows very high unmet loads for heating and the total energy consumption for space heating is 199 MBTU which is unrealistically low as compared to the baseline model space heating which is 6369 MBTU. We do not see many unmet hours in the control zone, but since the unit supplies many zones, we are getting very high unmet heating hours in non-control zone spaces. We are seeing on the order of 4000-5000 hours unmet in many zones.</SPAN></FONT></P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">I have modeled the heating for all zones by specifying the </SPAN></FONT></P>
<P class=MsoNormal><B><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt; FONT-WEIGHT: bold">Heat Source</SPAN></FONT></B> as hot water loop, </P>
<P class=MsoNormal><B><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt; FONT-WEIGHT: bold">The Zone Heat Source</SPAN></FONT></B> is not installed, as the design has no reheat. </P>
<P class=MsoNormal><B><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt; FONT-WEIGHT: bold">Zone</SPAN></FONT></B> <B><SPAN style="FONT-WEIGHT: bold">entering maximum supply temperature</SPAN></B> is at 110 degrees. </P>
<P class=MsoNormal><B><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt; FONT-WEIGHT: bold">Hot</SPAN></FONT></B> <B><SPAN style="FONT-WEIGHT: bold">deck max leaving temp</SPAN></B> is 80 degrees</P>
<P class=MsoNormal><B><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt; FONT-WEIGHT: bold">Reheat delta T</SPAN></FONT></B>: n/a</P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt"> </SPAN></FONT></P>
<P class=MsoNormal><FONT size=3 face="Times New Roman"><SPAN style="FONT-SIZE: 12pt">Many thanks in advance, </SPAN></FONT></P>
<P class=MsoNormal><B><FONT color=#009e49 size=1 face=Arial><SPAN style="FONT-FAMILY: Arial; COLOR: #009e49; FONT-SIZE: 9pt; FONT-WEIGHT: bold">Adam A. Gonthier</SPAN></FONT></B></P>
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