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<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2>Dave,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2>I have heard the rumors about a VRV system being added to
DOE 2.2 in the future as well. The last time I heard the rumor, the package was
supposed to be out this spring. As is true of the entire software industry, that
likely means it will appear sometime in the year 2012. (Predicted release date +
3 years = Actual release date)</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2>I hope there is someone on here who can better clarify the
date and progress of the package...</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2>To your second point, our office has been modeling Daikin
VRV systems in eQuest for a few months now. Don't get too excited... we haven't
actually installed one yet so we have no real data with which to prove that we
are modeling the systems correctly. That said, we also have only modeled their
"Heat-Pump" line and not their "Energy Recovery" line, which allows simultaneous
heating and cooling between zones.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2>We created custom curves with which to model the compressor
by taking Daikin Engineering data out of Daikin tables and plugging it into
eQuest. Then we model the system using the "Packaged Single Zone" system type.
We set the Indoor fan to two-speed and gave it a very light static pressure, due
to the fact that the system has multiple indoor fans with low static vs. one fan
with lots of static. We hard-keyed the CFMs, the rated capacities, the
compressor RPMs, low and high, the minimum cycling part load ratio, the cooling
(and heating) EIR, and set the compressor to variable speed type and gave it a
minimum unload ratio, again, all from Daikin literature. We used eQuest's
default low-speed EIR curve. The capacity curve and the EIR curves we
custom-created using eQuest and Daikin data.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2>The results seem logical. Again, it's hard to prove that
things are dead-on because we have no real building to compare our results to.
Hopefully, though, that will give you a place to start.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2>I am not confident that I am modeling defrost correctly,
and winter results in general seem more sketchy. I am using eQuest's default
defrost running time fraction, which I assume is more pertinent to standard
unitary equipment. Daikin's defrost seems more efficient. It also doesn't help
that Daikin doesn't use either resistive or reverse cycle for their defrost
strategy... it's actually hot-gas bypass.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=648060020-23032009><FONT face=Verdana
color=#0000ff size=2>One last thing, all of the engineering data that we
obtained from Daikin was published on their website, <A
href="http://www.daikinac.com">www.daikinac.com</A>.</FONT></SPAN></DIV>
<DIV><FONT face=Verdana color=#0000ff size=2></FONT> </DIV>
<DIV><SPAN class=648060020-23032009><FONT face=Verdana color=#0000ff size=2>I
hope this helps. Good luck!</FONT></SPAN></DIV><FONT style="FONT: 8pt Verdana"
face=verdana><BR><B>Gary Schrader<BR></B>Engineer I<BR><BR><B>TAC<BR></B>16011
College Blvd, Suite 212<BR>Lenexa, KS 66219<BR><BR>
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<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>Dave
Hostetter<BR><B>Sent:</B> Monday, March 23, 2009 2:58 PM<BR><B>To:</B>
equest-users@lists.onebuilding.org<BR><B>Subject:</B> [Equest-users] VRV System
Modeling<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=Section1>
<P class=MsoNormal>Hello All,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>I am working on a few projects which utilize Daikan VRV
systems and I am trying to model them using eQuest, without much luck. I
have talked with a couple of different people, including some at Daikan and
eQuest, and have heard that as of right now the only full building energy
modeling program that supports VRV systems is EnergyPro. I was also told
that an update to DOE2.2 and then eQuest which will address VRV systems is in
the works, but that these updates will most likely not be out for a couple of
months yet (maybe into next year). I also have heard that there have been
some people who have been able to approximate VRV systems within
eQuest.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>So my questions to all of you are: <o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>1). What would be the best / most accurate approach to
create a model of a building with a VRV system? Unfortunately I don’t
think that we can wait a few months for the updates, so would it make most sense
to purchase EnergyPro or try to use a workaround method within eQuest? Or
is there some third option that I am unaware of?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>2). Does anyone know how to approximate a VRV system
within eQuest and could explain it to me? What kind of accuracy could I
expect from this method?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Any help would be much appreciated!<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Thanks,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; COLOR: #00b011; FONT-FAMILY: 'Arial','sans-serif'">David
P. Hostetter<o:p></o:p></SPAN></P>
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