My first reaction is that you would need other tools that are more flexible in allowing for system descriptions. Following are some suggestions (which I have not tried) so I would be interested in knowing how you finally end up modelling these in eQuest. <br>
<br>Q1 - You could calculate the amount of reheat energy at 30% that goes into each zone and input that as an internal source energy, with a schedule. I think this will work but maybe it has some repercussions that I have not thought about. Another option could be that you set the min flows to 0.3 on the air side as well as the hot water loop (not sure if this will work).<br>
<br>Q2 - See if setting the lighting type to REC-FLOUR-RSV and changing the light-to-space, and light to-return makes any difference.<br><p>SUS-FLUOR Suspended, surface mounted or
recessed/non-vented fluorescent or HID.</p>
<p>REC-FLUOR-NV Recessed fluorescent or HID not vented
to return air or supply air.</p>
<p>REC-FLUOR-RV Recessed fluorescent or HID vented to
return air.</p>
<p>REC-FLUOR-RSV Recessed fluorescent or HID vented to
supply and return air.</p>
<p>INCAND Incandescent or
tungsten-halogen.</p>
Q3 - Not sure what you could do here other than use the duct losses input tabs in eQuest. There is a paper by LBNL folks - Duct Leakage Modeling in EnergyPlus and Analysis of Energy Savings from Implementing SAV with InCITeTM - that could give you some idea on what increases in energy to expect. If eQuest does not give you expected results, you might want to go to energyPlus. FSEC has done work on duct leakage and I think also updated/implemented it in energygauge software (based on doe-2) - you could see if they have any papers written about modelling it.<br>
<br>Thanks and good luck<br>-Rohini<br><br><br>--------------------------------------------------------------------------------<br>Rohini Brahme, Ph.D. LEED AP<br>Building energy analysis, tool development, and training<br>
Dallas/Fort Worth, TX<br><br><div class="gmail_quote">On Mon, Nov 8, 2010 at 7:36 PM, John Bixler <span dir="ltr"><<a href="mailto:JBixler@sebesta.com" target="_blank">JBixler@sebesta.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-US">
<div>
<p class="MsoNormal">Hello all,</p>
<p class="MsoNormal"> </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.</p>
<p class="MsoNormal"> </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.</p>
<p class="MsoNormal"> </p>
<p><span>1.<span style="font: 7pt "Times New Roman";">
</span></span>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.</p>
<p><span>2.<span style="font: 7pt "Times New Roman";">
</span></span>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).</p>
<p><span>3.<span style="font: 7pt "Times New Roman";">
</span></span>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.
</p>
<p> </p>
<p>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.</p>
<p> </p>
<p style="margin-left: 0in;">Thanks,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><b><span style="font-size: 10pt; color: rgb(0, 84, 128);">John Bixler, LEED AP BD+C</span></b></p>
<p class="MsoNormal"><span style="font-size: 8pt; color: rgb(128, 127, 131);">Mechanical Designer</span></p>
<p class="MsoNormal"><span style="font-size: 8pt; color: rgb(128, 127, 131);">Sebesta Blomberg <br>
<a href="http://sebesta.com" target="_blank">sebesta.com</a></span><span style="font-size: 8pt;">
<span style="color: rgb(128, 127, 131);">| P 319.364.1005 | M 319.558.9299 </span></span></p>
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