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Re: [EnergyPlus_Support] big zones - voids?
Also, understand that there is no long-wave radiant exchange between surfaces
in different zones. So, even though in a real building the walls in one zone
would "see" walls in another across the imaginary divide between zones (the
"void"), in the simulation, this will not happen.
The distribution of solar loads is another consideration as well. If a
significant amount of incoming solar enters one zone and passes through the
"void" to an adjacent zone, then you may need an interior window on the
dividing wall. Otherwise, all of the solar gains remain in the zone containing
the exterior windows.
Mike
On 8 Aug 2005, at 12:20, fred buhl wrote:
> Clarice,
>
> If you leave out the walls the will be no heat exchange between the
> zones. You could try using MIXING or
> CROSS MIXING but I doubt the result would be very satisfactory for "air
> walls". People generally model
> this situation with low resistance walls.
>
> Fred Buhl
>
> Clarice Bleil de Souza wrote:
>
> >Hi Linda,
> >
> >Thanks a lot for the answer.
> >In case I choose to leave out the walls and run a free float simulation, will
> >E+ account for heat exchange between the 2 zones? Do I need to specify sth that
> >simulate mass flow from one zone to the other?
> >
> >Once again thanks for the help
> >
> >Best regards,
> >
> >Clarice
> >
> >
> >Linda Lawrie <linda@xxxxxxxxxx> escreveu:
> >Yesterday's response to similar question:
> >
> >
> >
> >>You may model with a ficticious material (maybe r only) or leave out
> >>those "walls" and just use floor and ceiling in interior zones. You
> >>will get a warning that your zone does not have 6 surfaces/enclosure
> >>though (if you leave out the interior walls). You also can just use
> >>constructions with R values for those
> >>interior walls. Something appropriate but small R value.
> >>
> >>
> >
> >At 12:17 PM 8/8/2005, Clarice Bleil de Souza wrote:
> >
> >
> >>I would like to know if there is a way to model a void between 2 zones in E+.
> >>How does it account for the heat exchange between the zones that are separated
> >>by voids (no heat transfer surfaces - only air) ?
> >>
> >>
> >>
> >
> >If the zones are all conditioned at the same temperature, basically
> >there is no "heat exchange" between zones. One should account for
> >the thermal interior mass (e.g. furniture, partitions, etc) by
> >including internal mass objects.
> >
> >
> >Linda
> >
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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