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Thank's Joe, I didn't realize that. There are many quirks with DOE2
and eQuest. I haven't looked at that part of the fine print
recently. Leakage does depend on the wall area and not the floor
area in real terms. Buildings have many different wall heights,
plenums or not, ducted or not, etc. I would guess after
normalization that one would have to be careful with how
manipulations in geometry are done to achieve other effects in the
model. Infiltration can have a serious effect on a model.<br>
I can remember a past model where I used this technique for an
actual butting of 2 industrial spaces/buildings. The one area was a
cable casing thermal setting zone, 1/2 height of the
warehouse/machinery high bay zone that was adjacent to it. I was
more concerned with the door and seal between the 2 buildings. I
possibly missed the infiltration difference seeing it was based on
floor area and not wall area. I will have to re-read the fine
print.<br>
Bruce<br>
<br>
<div class="moz-cite-prefix">On 3/1/2018 10:32 PM, Joe Huang via
Equest-users wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20180302033320.IOBW2981.toroondcmxzimta03-srv.bellnexxia.net@tordcvbicmrk01">
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<p>I don't think Bruce's comment is germaine to the problem posed
by Menush, since Menush is asking about infiltration and not
heat transfer through interior walls. As far as I know from
DOE-2 (always have to add that caveat because I don't work much
in eQUEST), infiltration rates are normalized per floor area,
rather than external wall area, mainly because that's how the
infiltration models have been developed, i.e., effective leakage
areas have always been defined as per floor area. If you don't
think that's right, you can always adjust the input values by
the ratio of the external wall area to the floor area, as you've
described, but then you're on your own in coming up with the
correlation, <br>
</p>
<p>Joe<br>
</p>
<pre class="moz-signature" cols="90">Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd., Suite 205A
Moraga CA 94556
<a class="moz-txt-link-abbreviated" href="mailto:yjhuang@whiteboxtechnologies.com" moz-do-not-send="true">yjhuang@whiteboxtechnologies.com</a>
<a class="moz-txt-link-freetext" href="http://weather.whiteboxtechnologies.com" moz-do-not-send="true">http://weather.whiteboxtechnologies.com</a> for simulation-ready weather data
(o) (925)388-0265
(c) (510)928-2683
"building energy simulations at your fingertips"
</pre>
<div class="moz-cite-prefix">On 3/1/2018 6:44 PM, Bruce
Easterbrook via Equest-users wrote:<br>
</div>
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cite="mid:5669491f-8e14-0dce-e943-4b7f2f5dfa09@bellnet.ca">
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Hi Menush,<br>
I don't think you have the same thing. eQuest will treat 2
shells butted to each other differently than a single interior
wall separating 2 zones in a shell. It treats the 2 butted
walls as exterior walls with a tiny space between. They are the
same wall in your thinking but they are not. You can delete one
of them and make the remaining wall an interior wall and assign
the proper butting spaces on each side of the wall as sharing
the wall and transferring heating and cooling through the wall.
Or you can add an interior wall to the original space and
separate it into 2 zones. As you have noticed there is a
difference in the way eQuest treats your 2 solutions. It is
particular. Now you need to pick the configuration that matches
what you are trying to model in such a way that eQuest
does/treats the wall in the way you want it to work.<br>
Bruce Easterbrook P.Eng.<br>
Abode Engineering<br>
<br>
<div class="moz-cite-prefix">On 3/1/2018 5:23 PM, Menush Akbari
via Equest-users wrote:<br>
</div>
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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">I’m having an issue with infiltration
and wondering if anyone else has noticed this. When I’m in
wizard mode, I build a very simple rectangular shell and I
change the infiltration rate for perimeter zones to
0.05cfm/ft2. I leave the core zone infiltration rate to
the eQuest default value (0.001cfm/ft2). From my
understanding, the perimeter zone entered value in wizard
mode is based on exterior gross wall area. When I move on
to detail mode, eQuest changes the value to an
infiltration value per floor area instead of exterior wall
area. The values so far make sense and I can do the math
and get the same numbers eQuest calculates in detail mode.
No problems here.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The problem however happens when I
create different shells. For example, let’s say I have the
same rectangular building as mentioned above, but I split
this up into two different shells next to each other (two
square shells), therefore one of the walls of each square
shell is an interior wall, which means I should not see an
infiltration of 0.05 cfm/ft2 of the gross wall area.
However when I finish building these two shells in detail
mode (which would be identical to one rectangular shell),
the infiltration value is not accurate anymore. Instead of
the same numbers as my first model (one rectangular
shell), the second model calculates an exterior wall
infiltration value for the interior walls that are budded
up against each other.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone come across this? Is this a
quirk with eQuest and just needs to be changed manually in
detail mode, or am I doing something wrong here?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks for the help.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Cheers,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span
style="font-family:"Corbel",sans-serif;color:black;mso-fareast-language:EN-CA"
lang="EN-CA">Menush Akbari<o:p></o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Corbel",sans-serif;color:black;mso-fareast-language:EN-CA"
lang="EN-CA">BEng, PEng, BEMP, CMVP<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Corbel",sans-serif;color:black;mso-fareast-language:EN-CA"
lang="EN-CA">Senior Energy Engineer<o:p></o:p></span></p>
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<p class="MsoNormal"><i><span
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