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Re: [EnergyPlus_Support] Two beginner-level questions
1. This type of connection between two zones, sometimes referred to as an "air
wall", is not simple. There is no good answer to fully model this connection.
The best advice is to avoid it whenever possible and combine the zones. The
best you can do is to put a lightweight, high conductivity interzone surface
between the two zones. If you want to model solar gains penetrating into the
interior zone, then this surface must be a window. If you expect the two zones
to be at significantly different temperatures and/or humidities, then you may
also want to add a CROSS MIXING object to exchange air between the two zones.
2. When describing interzone surfaces, there is one construction that applies
to both instances of the surface. They are not stuck together, they are not
averages, they are one. For example, WALLAtoB is assigned a construction
consisting of CementBlock+Gypsum Board, and it's OutsideFaceEnvironmentObject
is WALLBtoA. WALLBtoA must has a construction which uses exactly the same
material layers but in reverse order, Gypsum board+CementBlock. The total mass
of this interzone wall is one layer of cement block and one layer of gypsum
board.
Mike
On 30 Aug 2007 at 21:28, josh_miarch wrote:
> I've searched the archives for answers to these questions and haven't
> been able to find anything that answers my questions exactly. So, if
> you'll all excuse the posing of some fairly elementary questions...
>
> 1. I want to create multiple zones within one space. How do I this? It
> seems that to define two zones as being in thermal contact with one
> another, one needs to specify a surface in each respective zone, and
> enter the name of one zone's surface in the other's
> OutsideFaceEnvironment Object field (and vice versa). But when one
> specifies a surface, one is also obliged to specify a construction for
> that surface -- despite the fact that there is no construction there!
> Is it as simple as creating a void construction of some kind and using
> this for the zone-separating surfaces?
>
> 2. When two surfaces are specified as thermally communicating using
> the OutsideFaceEnvironment and OutsideFaceEnvironment Object fields,
> what construction is used to calculated thermal transfer between the
> zones? Are the constructions of the thermally communicating surfaces
> stuck together, are they averaged, or is one or other chosen based on
> some criteria?
>
> Any assistance in these matters would be greatly appreciated.
>
> Thanks,
>
> Josh
>
>
>
> Josh Kjenner, EIT, LEED AP
> Manasc Isaac Architects Ltd.
> 10225 100 Avenue :: Edmonton, AB T5J 0A1
> 780.429.3977
>
>
>
>
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>
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>
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>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
>
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>
>
>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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