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<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=492372014-11122009>Kevin,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=492372014-11122009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=492372014-11122009>In my (limited) experience, it is not at all uncommon
for the boilers' capacity to exceed that of the heating water loop. Often times
this is done intentionally to prepare for building expansion in the future.
Double seems a bit odd, but perhaps the engineer was instructed by the building
owner to do so for redundancy or perhaps the building owner was planning on a
major expansion in the future. Maybe he just wanted to CYA,
too.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=492372014-11122009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=492372014-11122009>To answer your modeling question, I personally never
allow eQuest to auto size plant equipment. (Regardless of Baseline or Proposed)
The reason for this is because different efficiencies exist for the equipment
depending on how loaded the equipment is. In order to properly simulate the
amount of energy that your plant must consume to provide for the correct heating
(or cooling) load, eQuest has to know the part-load performance of the equipment
and how often that equipment operates at those partial loads. It is also
imperative that the correct boiler curves are input to calculate this part-load
performance as well. Most of the time eQuest's curves suffice, but I have made
my own before in some instances where I felt I could better match the particular
equipment that was going to be used on site.</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=492372014-11122009></SPAN></FONT> </DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=492372014-11122009>Hope this helps,</SPAN></FONT></DIV>
<DIV dir=ltr align=left><FONT face=Arial color=#0000ff size=2><SPAN
class=492372014-11122009>Gary</SPAN></FONT></DIV><SPAN
style="FONT: 8.5pt Arial"><BR><FONT
color=green>_______________________________________________________________________________________________________________________</FONT><BR><BR>
<P style="FONT: 8.5pt Arial" align=left><B>Gary Schrader</B> </B>| <B><FONT
color=green>Schneider Electric </FONT></B>| <B>Buildings Business</B> </B>|
<B>Energy Solutions </B>| <B>Engineer I</B><BR><B>Phone:</B> +1 </B>| <B>Mobile:
</B>+1 913 217 8068</B> | <B>Fax: </B>+1 913 469 0206<BR><B>Email: </B><A
href="mailto:gary.schrader@buildings.schneider-electric.com">gary.schrader@buildings.schneider-electric.com</A>
</B>| <B>Site: </B><A
href="http://www.schneider-electric.com/buildings">www.schneider-electric.com/buildings</A></B>
| <B>Address: </B>16011 College Boulevard, Suite 212, Lenexa, KS 66219,
USA<BR><BR><FONT color=green>*** Please consider the environment before printing
this email.</P></FONT></SPAN>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>From:</B> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <B>On Behalf Of </B>Kevin
Kelly<BR><B>Sent:</B> Friday, December 11, 2009 7:49 AM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] Modeling
Boilers<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Equest
World,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I am trying to fix the boilers
in the model and I have a question (both conceptual and modeling) related to
what capacity to model. This is a new construction project where I am
following 90.1 appendix G.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">This is what is going on with
the heating boilers (I’ll use simplified numbers)<o:p></o:p></SPAN></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="COLOR: #1f497d"><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN style="COLOR: #1f497d">There are 7 hot
water boilers that are used for the HHW (total capacity of 2500
MBTUH)<o:p></o:p></SPAN></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="COLOR: #1f497d"><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN style="COLOR: #1f497d">There are a electric
fan forced heaters in bathrooms and stairwells that (70
MBTUH)<o:p></o:p></SPAN></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="COLOR: #1f497d"><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN style="COLOR: #1f497d">There is a community
room in the basement that has a separate unit that provides both heating and
cooling (heating capacity of 70 MBTUH)<o:p></o:p></SPAN></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="COLOR: #1f497d"><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN style="COLOR: #1f497d">The heat from the
boilers is sent mostly through baseboard radiators and a few hydronic systems
(total heating capacity of (1200 MBTUH)<o:p></o:p></SPAN></P>
<P class=MsoListParagraph
style="TEXT-INDENT: -0.25in; mso-list: l0 level1 lfo1"><![if !supportLists]><SPAN
style="COLOR: #1f497d"><SPAN style="mso-list: Ignore">-<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN style="COLOR: #1f497d">From the above info,
the capacity of the boilers is 2500 while the total capacity for the heating
units that need the hot water is 1200. <o:p></o:p></SPAN></P>
<P class=MsoListParagraph
style="MARGIN-LEFT: 1in; TEXT-INDENT: -0.25in; mso-list: l0 level2 lfo1"><![if !supportLists]><SPAN
style="COLOR: #1f497d; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-list: Ignore">o<SPAN style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN style="COLOR: #1f497d">Is this
common? <o:p></o:p></SPAN></P>
<P class=MsoListParagraph
style="MARGIN-LEFT: 1in; TEXT-INDENT: -0.25in; mso-list: l0 level2 lfo1"><![if !supportLists]><SPAN
style="COLOR: #1f497d; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-list: Ignore">o<SPAN style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN style="COLOR: #1f497d">Did the designer
screw up? <o:p></o:p></SPAN></P>
<P class=MsoListParagraph
style="MARGIN-LEFT: 1in; TEXT-INDENT: -0.25in; mso-list: l0 level2 lfo1"><![if !supportLists]><SPAN
style="COLOR: #1f497d; FONT-FAMILY: 'Courier New'"><SPAN
style="mso-list: Ignore">o<SPAN style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><![endif]><SPAN style="COLOR: #1f497d">How would you model
it in both the baseline and proposed model? (ie which capacity am I using, or
should I just have eQuest autosize the boilers off of the cooling
design?)<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I hope this makes sense.
Thanks again for everyone’s continued help. Sooner or later I will have
enough skills where I can start answering calls for help like
mine.<o:p></o:p></SPAN></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Cheers,<o:p></o:p></P>
<P class=MsoNormal>Kevin Kelly, LEED AP<o:p></o:p></P>
<P class=MsoNormal>Energy Systems Analyst<o:p></o:p></P>
<P class=MsoNormal>R3 Energy Management<o:p></o:p></P>
<P class=MsoNormal>W: 914.909.3940 x115<o:p></o:p></P>
<P class=MsoNormal>M: 267.981.5012<o:p></o:p></P></DIV><BR>
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