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<DIV dir=ltr align=left><SPAN class=914442116-23082007><FONT face=Arial
color=#0000ff size=2>The default for VAV is to send air to the zones at 55F
(13C). Depending on how much outdoor air is part of the supply air, you may/may
not need heating at the system level. The increase from 55F to 90F (or whatever
the supply temp is during heating) happens at the reheat coils (which are at the
zone level). The preheat will depend on the amount of outside air. Hope this
helps.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=914442116-23082007><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=914442116-23082007><FONT face=Arial
color=#0000ff size=2>- Rohini</FONT></SPAN></DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> BLDG-SIM@gard.com
[mailto:BLDG-SIM@gard.com] <B>On Behalf Of </B>Zhen Tian<BR><B>Sent:</B>
Thursday, August 23, 2007 11:46 AM<BR><B>To:</B>
BLDG-SIM@gard.com<BR><B>Subject:</B> [BLDG-SIM] eQUEST-System no
heating<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Thanks, Michael.</DIV>
<DIV> </DIV>
<DIV>I did try the steps according to your suggestions. But I found the
following issues.</DIV>
<DIV> </DIV>
<DIV>In my model (detail model), I did not install the preheat coil. After
I install the preheat coil, I found that no matter how I increase the capacity,
the heating energy use for preheat coil is very small. I also tried to put
design day data into the detail mdel, it igave me the same result too.</DIV>
<DIV> </DIV>
<DIV>Based on my understanding, the zone level reheat coils are for space
heating load through building envelpe and infiltration; the main system heat
coil is to handle ventilation heating load. The preheat coil is just to preheat
incoming air to prevent frost.</DIV>
<DIV> </DIV>
<DIV>So I dont understan why the heat and preheat coil heeat energy use is so
small in the very cold climate (zone 7). In my model, the heat recovery was not
installed and the space type is regular office.</DIV>
<DIV> </DIV>
<DIV>Any suggestion is greatly appreciated.</DIV>
<DIV> </DIV>
<DIV>Thanks.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV> </DIV>
<DIV>David<BR><BR><B><I>Michael Andelman <mike@andelmanlelek.com></I></B>
wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">From:
"Michael Andelman" <mike@andelmanlelek.com><BR>To:
<tianzhen9@yahoo.com><BR>Subject: RE: [BLDG-SIM] eQUEST-System no
heating<BR>Date: Thu, 23 Aug 2007 10:21:34 -0400<BR><BR>
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<DIV class=Section1>
<DIV class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">If you do not assign
a capacity for the preheat coil, it is self sized based on heating design day
information (not the outside temperature from the weather
file).<o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">The wizard creates a
HDD for <st1:State w:st="on"><st1:place
w:st="on">California</st1:place></st1:State> ¡V you need to change the HDD
outdoor temperature or enter a coil capacity.<o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Mike<o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></DIV>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<DIV class=MsoNormal><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
BLDG-SIM@gard.com [mailto:BLDG-SIM@gard.com] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Zhen Tian<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, <st1:date w:st="on"
Year="2007" Day="22" Month="8" ls="trans">August 22, 2007</st1:date> <st1:time
w:st="on" Minute="09" Hour="15">3:09 PM</st1:time><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> BLDG-SIM@gard.com<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [BLDG-SIM] eQUEST-System no
heating</SPAN></FONT><o:p></o:p></DIV></DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></DIV>
<DIV>
<DIV class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Hi
Aulbach,</SPAN></FONT><o:p></o:p></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Thanks for your reply.
Yes, I inpu everything into the detail mode. Based on the
system design in climate. The air system has three typies of heating: 1)
preheating for preheating the incoming air to around 5 degree C; 2) main
system heating coil to heat the incoming air (this heat coil
is arranged after cooling coil); 3) reheat coil, this is the reheat
coil in zone level to meet the zone temperature
requirement.</SPAN></FONT><o:p></o:p></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">The one I found is the
2) main system heating coil never works. In the model, the preheating
coil was ignored. Seems that all heating load goes to the zone level
reheat coil.</SPAN></FONT><o:p></o:p></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Any idea about
this?</SPAN></FONT><o:p></o:p></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Thanks.</SPAN></FONT><o:p></o:p></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">Regards,</SPAN></FONT><o:p></o:p></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face=Arial size=3><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: Arial">David </SPAN></FONT><o:p></o:p></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><BR><BR><EM><B><I><FONT face="Times New Roman"><SPAN
style="FONT-WEIGHT: bold">"Aulbach, John" <<st1:PersonName
w:st="on">jaulbach@nexant.com</st1:PersonName>></SPAN></FONT></I></B></EM>
wrote:<o:p></o:p></SPAN></FONT></DIV></DIV>
<BLOCKQUOTE
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: medium none; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; MARGIN-BOTTOM: 5pt; PADDING-BOTTOM: 0in; MARGIN-LEFT: 3.75pt; BORDER-LEFT: #1010ff 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: medium none">
<DIV class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">I am going to take
a stab at this one. In eQuest, a VAV system is a Terminal System. Therefore,
in the Wizard, the zone level is where all heating and/or reheating is done
(and developed). You have to force a primary heating source to occur, but
this doesn't appear in the Wizard mode,
apparently..</SPAN></FONT><o:p></o:p></DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Have you input a
Reheat-Delta-T? The temperature of 55 DegF + 40 DegF = 95 DegF heating
supply temp.</SPAN></FONT><o:p></o:p></DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">I also do
NOT find the ability to create a pre heat coil in the Wizard. I have
done it, but am quite sure this was input in the Detailed Interface Mode.
There are MANY eQuest features that become available (like more
SYSTEM-TYPES) in the Detailed Mode.</SPAN></FONT><o:p></o:p></DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal><FONT face=Arial color=blue size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Once you have
"cookie cuttered" your building in the Wizards, switch to the Detailed Mode.
There you will find your preheat coil.</SPAN></FONT><o:p></o:p></DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"><o:p> </o:p></SPAN></FONT></DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR tabIndex=-1 align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<DIV class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><FONT face=Tahoma
size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
BLDG-SIM@gard.com [mailto:BLDG-SIM@gard.com] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Zhen Tian<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, <st1:date w:st="on"
Year="2007" Day="22" Month="8" ls="trans">August 22, 2007</st1:date>
<st1:time w:st="on" Minute="49" Hour="9">9:49 AM</st1:time><BR><B><SPAN
style="FONT-WEIGHT: bold">To:</SPAN></B> BLDG-SIM@gard.com<BR><B><SPAN
style="FONT-WEIGHT: bold">Subject:</SPAN></B> [BLDG-SIM] eQUEST-System no
heating</SPAN></FONT><o:p></o:p></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Dear All,<o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">I experienced an issue when I use eQUEST. I model a
building in cold climate with VAV system. In the wizard mode, I found the
system heat source is "not installed". But when I change to electricity, I
found the heating enery use for system heating is zero. I also tried other
options, always found that the system heat source is useless. I found that
all the heating goes the zone level. Based on my understanding, this should
not be the real case.<o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">I set the air supply temperature as constant as 55F
(around 13 degree C), zone entering max air tem as 95F. Enen I set the zone
entering max air tem as 86 (30 C). The system heating coil still has no
load.<o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Has anyone experience the same problem before and
know to to solve this problem?<o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Thanks a lot.<o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">Regards,<o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"> <o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt">David<o:p></o:p></SPAN></FONT></DIV></DIV>
<DIV>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
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