[EnergyPlus_Support] Re: Low Temp Radiant question

["Jean marais" <jeannieboef@xxxxxxxxx>]

The tube length regardless of length will stlill only tranfer heat from the surface in which it is embedded. That surface has fixed dimensions. If the internal source has enough "capacity", the suface in which it is embedded will remain at say 16 deg C, but the heat exchange of this surface with other radiant sufaces and via convection to the air remains limited by it's physical dimensions. I'm just thinking out load listening for feedback. 

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "onecolumbyte" <onecolumbyte@...> wrote:
>
> I would expect that the capacity of the radiant system would strongly be related to the temp and area of the surface. 
> 
> If the main cooling plant is undersized the water temp may be above design temp. Otherwise it should be almost constant.
> 
> Typically we specify radiant objects by tube length and diameter. These are indepenent of the zone sizing object.
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Jean marais" <jeannieboef@> wrote:
> >
> > Do you expect the sizing parameter to effect the cooling ability of a radiant ceiling much?
> > 
> > Provided the cooling ceiling surface temp is constantly held at say 16 deg C, and the main radiation exchange is with the opposite floor which very quickly reaches the same temp, do you expect the convection heat transfer to room air to increase with increasing sizing factor? I think not. 
> > 
> > I think increasing the surface area is the only way. 
> > 
> > I'm trying this now by inserting interzone surfaces into the zone all with internal source. 
> > 
> > What do you think? I'm applying this to a zone where I had previously lumped 3 levels together. I'm actually missing the interlevel partitions till now, and noticed the radiant system wasn't performing well.
> >
>




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