[bldg-sim] eQUEST question

[Sheila Sagerer]

Xiaobing-

You may have a couple options here.

1.  The easiest thing to do would be to add an interior wall (ceiling) to
connect the gym space to the "under roof" space.
    a.  If the gym space is actually open all the way to the roof, the
interior wall construction should be entered as an "air wall" (U-value=1.00)
to allow complete heat transfer between the spaces.  Both the gym and "under
roof" spaces and zones should be designated as "conditioned" and be served
by the same HVAC system.  The roof load would then show up in the LS-C
report as a roof load.

    b.  If the gym space is not open to the roof, the interior wall
construction should be whatever the actual materials are with the
corresponding U-value to allow heat transfer between the two spaces.
(eQuest will not calculate heat transfer between spaces without an interior
surface to connect the spaces.)  The "under roof" space and zone would
remain "unconditioned".  The load from the roof would show up in the LS-C
report indirectly as an interior surface load.

2.  If the gym space is actually open all the way to the roof, your other
option would be to transfer all exterior surfaces from the "under roof"
space and attach them to the gym space.  Then eliminate the "under roof"
space and zone.

Hope this helps.  Have a nice weekend.

Sheila Sagerer
Energy Engineer, LEED AP
Energy Opportunities, Inc
Phone: 717-880-9069
Fax: 717-291-9497


  -----Original Message-----
  From: postman at gard.com [mailto:postman at gard.com]On Behalf Of Liu, Xiaobing
  Sent: Friday, April 22, 2005 1:19 PM
  To: bldg-sim at gard.com
  Subject: [bldg-sim] eQUEST question


  Dear eQUEST users:

  I meet a problem when I use eQUEST to model a gymnasium, which has a
pitched roof. eQUEST automatically separate the gymnasium to two spaces: one
is a cube-shape "Space" (under the roof) and the other is a triangle- shape
"Under Roof". While the "Space" is specified as conditioned, the "Under
Roof" is specified as un-conditioned by eQUEST.

  As shown in the report LS-B (Space Peak Load Components), there is no load
from roof for the "Space" but there is load from roof for the "Under Roof".
However, as shown in the report LS-C (Building Peak Load Components), only
the loads for the "Space" are accounted for. So, my question is where the
load from roof is? In the simulated gymnasium, there is no ceiling and the
roof is exposed to the space of the gymnasium. As a result, the load from
roof should be included (at least partially) in the building peak load,
which needs to be treated by the HVAC system. Am I right? Does eQUEST
actually account for this load although it doesn't show in the report LS-C?

  Your suggestions and comments is highly appreciated.

  Xiaobing

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