Re: [EnergyPlus_Support] Radiant Ceiling Heating??

["Josh K" <jeemang@xxxxxxxxx>]

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>
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]


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