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[bldg-sim] eQUEST question
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
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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