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<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>All;<br>
When simulating (eQ v3-61, DOE-2.2 v44e4) a building with a "plenum"
(unconditioned or plenum), and changing the roof absorptance greatly, the auto-sized
design air flow does NOT seem to change in the zone below, even though the ZONE
SIZING-OPTION = ADJUST-LOADS. After observing this in a big model, I tested
this in a simple single zone model (eQ Wiz). I made sure airflow sizing was
driven by cooling loads, and created a parametric run that changed the
ABSORPTANCE of the roof construction between 90% and 10%. Hourly cooling loads
vary as expected, but design airflow remains the same between both models.<o:p></o:p></span></font>
</p>
<p style='margin-bottom:12.0pt'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Raising the DESIGN-COOL-T (from the default 75F, same
for all zones) in the "plenum" increases the design airflow in the
zone below (for both absorptances), but I thought ADJUST-LOADS did more than just
recognize this input. The problem seems to persist whether I have a cooling
design day or not, and whatever I do with the LOADS SPACE "TEMPERATUREs"
and ZONE DESIGN-COOL-Ts. <br>
<br>
Any insights out there? Anyone else notice this behavior? Is this a bug, or did
I expect too much of the program? Unless the DESIGN-COOL-T is raised (to a
value one must estimate or find by inspection of hourly reports), it appears the
program under-sizes airflow to zones where a significant fraction of the heat
gain is through a ceiling cavity/plenum/attic, or I suppose any
"un-conditioned" buffer space.<br>
<br>
Fred Porter<o:p></o:p></span></font>
</p>
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