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Hello Kendra,
The following is a link to a blog
I've started with the intent to eventually collect all the arcane but useful
scraps information necessary to do these energy analyses
efficiently:
There's link within this to an Energy
Designed Resources paper that I used (Which another kind user in turn had
pointed me to) to set up my prototype displacement ventilation
system. While doing so I also found the screenshot in eQuest 3.6 that
shows the 'lighting heat to return air or adjacent space' (i.e. plenum) option
that the EDR paper does not mention.
Assigning the stratified heat
fraction using this screen may prove useful in solving your problem... but I
can't state that definitively has I haven't had the chance to really test
it out.
If this does indeed solve your
problem and you have a moment, please let me know... I'll be getting back the
simulation business soon enough.
Brandon
From: BLDG-SIM@xxxxxxxx [mailto:BLDG-SIM@xxxxxxxx] On Behalf Of Tupper, Kendra Sent: Monday, September 18, 2006 3:26 PM To: BLDG-SIM@xxxxxxxx Cc: kevinjm5000@xxxxxxxxx Subject: [BLDG-SIM] : eQuest Underfloor Air I’m trying to use eQuest to compare
an Underfloor Air System and conventional VAV system. I have modeled the
Underfloor case according to the Addison/Nall paper, and am having some issues
with the return air temperatures. I have modeled two stratified zones
(a lower occupied 5’ zone, and an upper 8’ plenum space). A portion of the
internal gains and window conduction is modeled in the plenum space, and the
return air path is set to PLENUM. I expected a portion of the cooling
loads to be transferred to the return air, raising the return air temperatures,
and allowed the loads in the occupied zone to be met with a higher supply air
temp (SAT). However, when I increase my SAT for
the underfloor case, my cfm and fan energy increases accordingly. I output
hourly return air temps for the two cases and found that they were the same –
adding heat gains to the plenum space did not increase the return air temps.
Further, I adjusted my heating and cooling setpoints for the zones, and
found that the return air temps are equal to these zonal setpoints, regardless
of what load is imposed on the plenum spaces. Has anyone experienced this
problem? Thanks! Kendra Kendra
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