[EnergyPlus_Support] Re: Suspended radiant panels

["josh_miarch" <jeemang@xxxxxxxxx>]

Hi Mike;

I'm also doing a simulation with a suspended radiant panel, and I've
found that if I define another opposite-facing surface and connect it
as an "interzone" surface with the radiant surface, I either get a
bunch of "heat balance did not converge" warning messages, or an
"Interzone surfaces are usually in different zones" error message,
depending on how I specify the constructions of the hydronic surface
and its backing. 

However, if I specify the radiant surface as one would an adiabatic
surface (ie OtherZoneSurface = itself), I seem to get reasonable results. 

Any thoughts on this?

Thanks,

Josh


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
<mjwitte@...> wrote:
>
> 1.  I suppose you could describe a surface which is positioned as
thought it is 
> supsended.  This would have to be a pair of surfaces (one facing up
and one 
> facing down) which are connected as "interzone" surfaces even though
both are 
> in the same zone.  But understand that the radiant view factor
calculations are 
> not full 3-D.  View factors are affected by azimuths and tilts, but
position in 
> the zone does not matter.  If the radiant panels are electric, you
could use 
> the high temperature radiant model (HIGH TEMP RADIANT SYSTEM) and
specify the 
> view factors directly.
> 
> 2.  Low temp radiant systems are only valid on base surfaces (not
subsurfaces, 
> no internal mass).  You would need to describe the ceiling as two or
more 
> SURFACE:HEATRANSFER objects, one with the area of the radiant panel,
and one 
> with the remaining ceiling area.
> 
> Mike
> 
> 
> On 5 Sep 2007 at 13:21, lorenzomattarolo wrote:
> 
> > Hi, 
> > I'm simulating an office with radiant panels on the ceiling.
> > 
> > 1. Is it possible to put the radiant panels as they were suspended
> > from the ceiling?
> > 
> > 2. The panels aren't as wide as the ceiling. How can I set this in the
> > surfaceHeatTransfer? Do I have to put one surface with a normal
> > construction for the ceiling and a smaller one with internal source
> > for the panel?
> > 
> > Many thanks,
> > 
> > Lorenzo
> > 
> > 
> > 
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> > 
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> > 
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> > 
> > 
> > 
> > 
> 
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support      
> EnergyPlus-Support@...
>




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