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short answer: no<br>
<br>
longer answer: equest reverts to a default efficiency of the type
of unit selected, in eir/hir not seer/eer or hspf/cop, that is not
based on 90.1-2004, 2007, or 2010. the 'easiest' method of
determing a 'correct' efficiency (search archives for different
methods of calculating a 'correct' efficiency') is to simply open a
dummy project, go to the hvac systems, change the efficiency (in
seer or eer as applies to the minimum required for your unit type)
to the 90.1 required, save the project, then switch it to detailed
mode & look at the hvac unit efficiency in eir/hir.<br>
<br>
out of curiosity, what was the exact comment & what did the
modeler use for what system types?<br>
<br>
On 6/12/12 2:11 PM, Laura Howe, RCE wrote:
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<p class="MsoNormal">HI All-<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">While there are some posts similar to this
issue, I want to ask the group for clarification for a
slightly different application. Please bear with me for some
assistance, I’d sure appreciate it!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am working on someone else’s model that
has had comments back from GBCI for a LEED project. The model
came to me in detailed mode. They note that in the baseline
model apparently non-90.1 baseline efficiencies were used.
Looking at the model, it does seem that the modeler manually
entered efficiencies (they are in red) and they do not seem to
be correct (even the GBCI comment notes this). They are less
efficient than 90.1. In some of the similar threads on this
topic, someone mentioned that you can revert to autosizing by
right clicking on the heating and cooling capacity and
selecting “restore default”. Since the modeler did not
manually input system size, just system efficiency (both
cooling and heating hp eff, fan design kw/cfm and total eff
frac seem to be manually entered), my question is if I restore
those efficiency values to default (using right clicking),
will Equest use the proper efficiencies and I’m good to ho?
I’ve done this, and it seems to work, although I’m not
experienced enough to truly verify this. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">When I compare the two models (original
base and my reverted base) I do see where the power demand has
dropped (SV-A), and none of the peak loads have changed (LS-A)
but the equipment sizing (SV-A) has increased. This all seems
correct, do others think I am on track here? Using the
correct methodology?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I can also confirm another question,
LEED specific. I understand 90.1 is the only appropriate base
case for LEED even in Washington state, even if portions of
their energy code are more stringent, correct? The
requirement to achieve a 10% reduction is how I think LEED
addresses more stringent state codes so the base doesn’t need
to be written specific to those (numerous) state codes.
Correct? One comment from the client leads me to think that
complying with WA code might explain the difference in
equipment efficiencies used in the base case, and even though
it doesn’t add up I want to confirm my understanding.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Another issue that further confuses this is
that the modeler apparently chose two of the systems to be
variable speed (all are system type 4, constant volume in
90.1) and I’m not sure why. The original modeler is not
available for questioning. Any ideas? The VFD’s were applied
to an office space and data/server room packaged heat pumps,
but not a large storage space. Based on what I know right
now, it seems those should be modeled constant volume. If I’m
updating the base model, I think it makes sense to correct
this if the base incorrectly models a more efficient system.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Lastly, can anyone tell me how to change
the project descriptor at the top left of the sim reports?
It’s got some boilerplate name and it sure would be nice to
have the filename show, or at least a single descriptor I can
update in each model run.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks so much-<o:p></o:p></p>
<p class="MsoNormal">Laura<o:p></o:p></p>
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