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<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>
<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.
Internet communications are not secure against interception or modification.
Sebesta Blomberg therefore can not guarantee that this message has not been
modified in transit. This message and any files transmitted with it are
confidential and intended solely for the use of the addressee. If you have
received this message in error please notify the sender and destroy your copies
of the message and any attached files.<o:p></o:p></span></i></p>
<p class=MsoNormal><o:p> </o:p></p>
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