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Re: [EnergyPlus_Support] Question about modelling false ceiling
Hello Filipe,
I have just uploaded the latest DesignBuilder 1.3 WebHelp and this contains
some useful information on the definition of block and zone dimensions. I
would recommend taking a look at the following topics:
http://www.designbuilder.co.uk/programhelp/index.htm#block_and_zone_dimensio
ns.htm
and,
http://www.designbuilder.co.uk/programhelp/index.htm#separate_constructions.
htm
...click on Show Diagram.
Note that blocks are defined using the external dimensions and zones show
the correct internal dimensions so that the zone volumes are accurately
calculated. In DesignBuilder version 1.3 (due for release soon) you can
choose whether or not to include the suspended ceiling and raised floor gaps
(voids) in the zone volume for natural ventilation and mechanical
ventilation purposes when using "Separate" definition of constructions.
1. In simple terms, the block height should include the floor slab but
exclude the floor slab of the floor above.
2. It is not generally necessary to define false ceilings as separate zones
unless you wish to use them as supply/return air plenums.
3. By default yes, but if you are using DesignBuilder version 1.3 with
"Separate" constructions you can exclude ceiling and floor voids.
If this does not explain it please contact DesignBuilder support either
through the forum or by e-mailing us.
Regards,
Andy Tindale
DesignBuilder Software
-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of Filipe
Sent: 26 June 2007 10:54
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Question about modelling false ceiling
Hello all,
I've a modelling issue related to false ceilings...
Usually, I create my geometric model in DesignBuilder, in which I
define the block height. Intuitively, I assumed that this block height
correspond to the zone height from the floor to the false ceiling (if
existent) or from the floor to the slab. Exporting the idf file I 've
concluded that the block height is ALWAYS the zone´s height and if I
define a suspended ceiling, DB automtically defines two aditional
layers (ceiling material and an air gap), in the floor/ceiling
construction.
So, my point is:
1. Should I model my building defining the zone height from floor to
false ceiling and add the ceiling material and air gap layers to the
floor/ceiling construction (By doing this i'm loosing external
building area)
2. Should I define an additional zone with false ceiling height (more
computacional effort), even if I'm not simulating a return plenum,
between the two building floors
3.Do the simulation as defined in DB defining the total height from
the floor to the slab (By doing this, i´m increasing the heated or
cooled volume and the 'fresh air' volume
I'm not an experienced user, so I would like to ask experienced users
which is the most reasonable choice to solve this question
Thanks in advance
Best Regards
Filipe Madureira
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