Re: [EnergyPlus_Support] Radiant Ceiling Heating??

["Josh K" <jeemang@xxxxxxxxx>]

Hi Tasos;

If you don't put another Surface:HeatTransfer object on "top" of the
"bottom" one with the CONSTRUCTION WITH INTERNAL SOURCE, and instead specify
the "bottom" Surface:HeatTransfer object as adiabatic, you won't get any
radiant heat transfer from the top side of the panel to the ceiling of the
zone. That's why I used the two surface approach.

Josh


On Thu, Apr 3, 2008 at 10:50 AM, Tasos Ioannou <tasos.ioannou@xxxxxxxxx>
wrote:

>   Hi Josh,
>
> Thank you for the reply and your information. Though I would like to ask
> you why did you make two surface heat transfer objects and not only one? Why
> not making this radiant panel only as a construction with internal source?
> You made another surface that you put on top of the construction with
> internal source. Was that necessary? Thank you again for the valuable reply
> and hope to hearing from you soon.
>
> Best ragards
>
> Tasos Ioannou
>
> Josh K <jeemang@xxxxxxxxx <jeemang%40gmail.com>> wrote:
> Hi Tasos;
>
> I had to model something similar to this, and I ended up creating a couple
> of Surface:HeatTransfer objects, with each one specified as the surface in
> the other's "OutsideFaceEnvironment object" field. I created one surface
> to
> represent the "bottom" of the panel and one to represent the "top," with
> each surface's normal facing "into" the panel. For the "bottom" surface I
> used a CONSTRUCTION WITH INTERNAL SOURCE and for the top surface just a
> regular CONSTRUCTION with the same elements as the bottom surface but in
> opposite order (just like you would do with adjacent wall surfaces). One
> last thing: the panels I'm modeling have insulation on the "top" side (ie,
> the side opposite the room they're heating), and before I knew this I
> tried
> to model the panels without an insulation layer on top. I got some errors
> and weird results that only stopped when I added at least one non-metal
> MATERIAL:REGULAR to either of the CONSTRUCTION objects.
>
> I seemed to get pretty good results with this approach. If you have the
> DisplayExtraWarnings option selected in the DIAGNOSTICS object you'll get
> some "severe error" warnings about having interzone surfaces in the same
> zone, but they don't seem to affect the running of the simulation.
>
> Josh
>
> On Wed, Apr 2, 2008 at 8:07 AM, tasos.ioannou <tasos.ioannou@xxxxxxxxx<tasos.ioannou%40yahoo.com>
> >
> wrote:
>
> > Dear Forum,
> >
> > We are modeling a building that is using a Hydronic Radiant System
> > with embedded hydronic tubes inside the walls. In order to model this
> > system we will use the Low Temp Radiant System: Hydronic object that
> > EnergyPlus is providing. At the same time the building is also using
> > another system that is called Radiant Ceiling Heatingwhich is a
> > development of the traditional Hydronic Radiant Ceiling Heating. The
> > radiant element is enclosed in a steel casing 600x600 mm that will be
> > hanging from the ceiling of each zone/office above each desk. Does
> > anyone know how can we model this second system? Which object is the
> > best option for such an independent, enclosed, hanging Radiant Unit?
> > Thank you in advance...
> >
> > Regards
> >
> > Tasos
> >
> >
> >
>
> --
> Josh Kjenner, EIT, LEED AP
> Manasc Isaac Architects Ltd.
> 10225 100 Avenue :: Edmonton, AB T5J 0A1
> 780.429.3977
>
> [Non-text portions of this message have been removed]
>
> ---------------------------------
> You rock. That's why Blockbuster's offering you one month of Blockbuster
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>
> [Non-text portions of this message have been removed]
>
>  
>



-- 
Josh Kjenner, EIT, LEED AP
Manasc Isaac Architects Ltd.
10225 100 Avenue :: Edmonton, AB T5J 0A1
780.429.3977


[Non-text portions of this message have been removed]


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