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because the airflow you input is based at sea level. if you input
1,000 cfm and your project is in tucson it will be multiplied by an
altitude correction factor of 1.08. rio rico, az has an altitude
correction factor of 1.14. this is for all air flows you manually
input. exhaust, return, supply. check your .inp file near the top
& it will have a line telling you what the altitude correction
factor is. divide your input cfm by this number so when it multiplies
it back out the simulation uses the cfm you want it to, if that's your
goal.<br>
<br>
On 5/17/11 8:42 AM, Karen Walkerman wrote:
<blockquote
cite="mid:BANLkTinBq_mFjFNaDv7CSe9KVv=hiKLxRw@mail.gmail.com"
type="cite">
<div>The increased airflow is probably due to a system sizing ratio
greater than 1.0<br>
</div>
<div><br>
</div>
<div>--</div>
<div>Karen</div>
<br>
<div class="gmail_quote">On Tue, May 17, 2011 at 8:18 AM, Rob Hudson <span
dir="ltr"><<a moz-do-not-send="true" href="mailto:rdh4176@gmail.com">rdh4176@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Because
the unit is discharging the relief air and not individual room exhaust
fans, you should leave all exhaust fans out of the picture. Make sure
you set the unit to be minimum of 1.00 ratio of outdoor air as well, to
ensure that the unit is 100% OA.
<div><br>
</div>
<div>I would also check your elevation coefficient, this could be
the cause of the increased supply air numbers you are seeing (but for
the rather large increase you are seeing, something else may be causing
issues as well). I typically see values less than 10% for elevation
values (at 1.10, would make your 7,500 cfm unit become 8,250 cfm).</div>
<div><br>
</div>
<div>I'm sure others will have good ideas as well.</div>
<div><br>
</div>
<div>-Rob</div>
<div><br>
<div class="gmail_quote">
<div>
<div class="h5">On Tue, May 17, 2011 at 7:59 AM, Brad Robinson <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:brad.robinson@yahoo.com" target="_blank">brad.robinson@yahoo.com</a>></span>
wrote:<br>
</div>
</div>
<blockquote class="gmail_quote"
style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div>
<div class="h5">
<div>
<div
style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: arial,helvetica,sans-serif; font-size: 10pt;">
<div>Sorry for all of the questions recently on this list, but
this is the first serious modelling attempt I am trying with eQuest.</div>
<div><br>
</div>
<div>I have a constant volume, 100% OA unit serving patient rooms
and corridors in a long term care facility. I have set the airflow
for the unit at 7,500 cfm. When I look at the SV-A report, the airflow
is showing at 9,090 cfm. I then tried going into each individual
sub-zone and setting the airflows. The sub-zones airflows in the SV-A
report are higher than what I have entered, and the total airflow still
remains at 9,090. I am thinking perhaps I have picked the wrong
system. I assumed I could use a packaged single zone for this case.
Perhaps I should be using a different system type? </div>
<div><br>
</div>
<div>The other part of the question is how do I model the fact
that is 100% OA? Th only reasonable solution I have found is to have
the exhaust air in each zone track the supply flow. It is also asking
for either static pressure and efficiency, or kw/cfm. As the exhaust
is at the unit itself via heat recovery using a heat pipe, I am not
sure what I should be entering here, as the fan details would be
entered at the unit itself. Thanks in advance for any help. <br>
</div>
<font color="#888888">
<div><br>
</div>
<div>Brad Robinson<br>
</div>
</font></div>
</div>
<br>
</div>
</div>
</blockquote>
</div>
</div>
</blockquote>
</div>
</blockquote>
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