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<p class=MsoNormal><span style='color:#1F497D'>Those are some good questions!
I’ll be interested to hear others’ suggestions/thoughts…<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 think I can help directly with
question #2: <o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>All heat from lights
can ultimately go 3 ways in eQuest, corresponding to 3 fractional variables you
can define/modify for lighting internal loads:<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo3'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>LIGHT-TO-SPACE –
what fraction of heat goes straight into the conditioned space<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo3'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>LIGHT-TO-RETURN –
directly into the return air path (think: recessed fixtures in a return
air plenum)<o:p></o:p></span></p>
<p class=MsoListParagraph style='margin-left:1.0in;text-indent:-.25in;
mso-list:l0 level2 lfo3'><![if !supportLists]><span style='font-family:"Courier New";
color:#1F497D'><span style='mso-list:Ignore'>o<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>LIGHT-TO-OTHER –
allows you to specify a space for heat to go that isn’t part of a return
path.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>If you wish to model
the effects of troffer diffusers, I think the most direct way to do so would be
to differentiate from normal troffers by modifying the above fractions between
the two runs, found under the internal loads tab (not at the system level).<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>Carefully review
your options (i.e. the DOE2 help entry) for “</span>RETURN-AIR-PATH<span
style='color:#1F497D'>” at the system level to be sure you aren’t
skewing the meaning of what you want to input.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo3'><![if !supportLists]><span
style='color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='color:#1F497D'>While you might take
a variety of other approaches… on a fundamental level, if you try to
account for lighting system behavior at the system level (modifying supply
temps and the like), you’re likely going to run into the problem of
needing to differentiate the lighting and HVAC systems’ scheduling at
some point… <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 may be missing some
fundamentals, but I suspect that light troffer diffusers aren’t that
inefficient on a wholistic system level (in the grand scheme of things) –
ultimately the heat generated by the lights doesn’t just disappear if
kept out of the supply/return paths… that heat eventually needs to be
dealt with by the HVAC, directly or indirectly. I suppose local
thermostats might trip less frequently<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'>Someone with more experience may
be able to suggest a path to #1… I’m stuck for ideas there.<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'>To #3, I think you need to be
more explicit regarding which variables you changed, and what the new/old
values were. It might help to start with understanding what eQuest is
modeling before you ‘enable’ these values… the
following may help: <o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal>Volume 5: Compliance Analysis<span
class=d2hbreadcrumbslinkseparator> > </span>Performing Compliance Analysis<span
class=d2hbreadcrumbslinkseparator> > </span>Building Modeling Topics<span
class=d2hbreadcrumbslinkseparator> > </span>Duct Efficiency Calculations >
Detailed Interface<span style='color:#1F497D'><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'>Best of luck,<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'>~Nick<o:p></o:p></span></p>
<div>
<p class=MsoNormal><span style='color:#1F497D'><img width=119 height=37
id="Picture_x0020_1" src="cid:image001.jpg@01CB7FE7.573A69D0"
alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";
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<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'><o:p> </o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";
color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;
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<p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER</span><span
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<p class=MsoNormal><i><span style='font-size:10.0pt;color:#2D4D5E'>Check out
our new web-site @ </span></i><span style='color:#1F497D'><a
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<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<div>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org
[mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>John
Bixler<br>
<b>Sent:</b> Monday, November 08, 2010 7:37 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Modeling inefficiencies of existing buildings<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Hello all,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’ve been using eQuest recently to support studies of
existing buildings, and to evaluate the energy savings of different options.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’ve struggled with trying to model some of the
problems we’ve discovered in the older buildings. Any thoughts on
the following would be greatly appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Failed reheat valves: Reheat valves that are
stuck in the open position. Not only does this increase the heating hot
water use, but it should affect fan energy and chilled water use as well.<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Light troffer diffusers: All the vogue in the 60s
and 70s, these combination lights and diffusers result in a large thermal gain
as the air enters the zone. eQuest has “duct delta T”,
however that assumes a heat loss under cooling. This condition is always
a gain of heat (and technically this will vary based on the temperature of the
air entering the zone).<o:p></o:p></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo2'><![if !supportLists]><span
style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'>
</span></span><![endif]>Duct Leakage: A massive problem until recently,
measured leakage values can often be 30% or more. eQuest has an apparent
entry for this, however, each time I’ve enabled it, I’ve seen large
REDUCTIONS in energy use. Again, this is a condition that results in
increased usage of all utilities as the zones struggle to meet their
setpoints. <o:p></o:p></p>
<p class=MsoListParagraph><o:p> </o:p></p>
<p class=MsoListParagraph>Also, duct leakage is assigned at the system level.
It appears eQuest then wants you to assign what plenum the duct is leaking
“to”. Depending on how I specified my systems in the wizard,
I have ended up with a plenum zone for each zone on a floor (which might mean
30 zones per floor) or one big plenum per floor. If I have a system that
serves zones on several floors, it dosent seem like eQuest will let me assign
the leakage to go all the plenums the system is assigned to, evenly. I
have to pick a SINGLE zone that all the leakage goes to.<o:p></o:p></p>
<p class=MsoListParagraph><o:p> </o:p></p>
<p class=MsoListParagraph style='margin-left:0in'>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='text-autospace:none'><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#005480'>John Bixler, LEED AP BD+C<o:p></o:p></span></b></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif";color:#807F83'>Mechanical Designer<o:p></o:p></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif";color:#807F83'>Sebesta Blomberg <br>
sebesta.com</span><span style='font-size:8.0pt;font-family:"Arial","sans-serif"'>
<span style='color:#807F83'>| P 319.364.1005 | M 319.558.9299 <o:p></o:p></span></span></p>
<p class=MsoNormal style='text-autospace:none'><span style='font-size:8.0pt;
font-family:"Arial","sans-serif";color:#807F83'><o:p> </o:p></span></p>
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