Re: [EnergyPlus_Support] Radiant Floors - slab on grade losses?

["Michael J. Witte" <mjwitte@xxxxxxxx>]

I asked the team for suggestions on how to model this using current EnergyPlus 
capabilities.  Here was one suggestion:

"The best the user could probably do is try some testing to check and see what 
the potential impact of modeling ground heat transfer outside E+ will have.  I 
could see three separate runs: ground model as per the normal instructions 
(basically ignoring the presence of the radiant system), ground model with 
elevated interior temperatures for when the radiant system is expected to run 
to account for higher slab losses, and using the old 12" of dirt assumption.  
The user could then compare the results and see how different things are.  Of 
course, it will all depends on how much insulation the user has below the 
slab."  

I could think of some ways to expand on this, but they would all require 
multiple runs and some experimenting.

Mike


On 21 Jun 2007 at 23:14, taharvey2001 wrote:

> We're trying to model a radiant floor system, slab on grade. The
> trouble I'm having is the ground (slab preprocessor) modeling is
> decoupled from the actual simulation. I'm not sure there is a accurate
> means to model radiant floors losses in a slab in E+. The preprocessor
> assumes an air to slab convection, doesn't consider HVAC cycling
> on/offs, and of course isn't actually coupled to the building simulation.
> 
> Anyone have ideas on how to do this in a reasonable accurate way? We
> are open to other tools besides E+ too.
> 
> When will ground loss simulations be coupled with the main simulation
> engine. The current preprocessor situation we find very unsatisfactory
> in many situations.
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
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> 
> Attachments are not allowed -- please post any files to the appropriate folder
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> 
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> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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