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<p class=MsoNormal><span style='color:#1F497D'>I hadn’t heard much back about
the questions I raised below. #3 in particular, I was hoping to rephrase and
gain some additional insight:<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'>In a existing building (system
type, VAV reheat with very little turndown), where the airflows are known (and
entered into equest), by adding duct leakage via the Duct Air Loss Ratio, with
a low (near 0) Duct Air Loss OA (meaning very little of the leaked air “exfiltrates”
the building), what would the expected result be?<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'>Clearly the fans will operate
more, so one would expect electric usage to increase.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><br>
But what would you expect the heating and cooling utilities to do?<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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<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"'> 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> Modeling inefficiencies of existing buildings<o:p></o:p></span></p>
</div>
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<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:l0 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:l0 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:l0 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>
<p class=MsoNormal style='text-autospace:none'><i><span style='font-size:8.0pt;
font-family:"Arial","sans-serif"'>This message has been sent via the Internet.
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