Re: [EnergyPlus_Support] Slab cooling for open sky (walk way)

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

EnergyPlus by default uses a uniform temperature for all of the air in a 
thermal zone (well-stirred assumption).  Beyond that, there are some options 
for limited thermal stratification for displacement ventilation and underfloor 
air distribution (UFAD) modeling.  There are also models for natural 
ventilation, but these assume a well-stirred air mass within a single thermal 
zone.  To combine open-air wind effects with thermal stratification seems that 
it would require a CFD (computational fluid dynamics) model.  If you were to 
model this situation using CFD, I suppose you could then take the resulting 
temperature profiles and model them in EnergyPlus using USER DEFINED ROOMAIR 
TEMPERATURES.

Mike


On 27 Jul 2006 at 18:07, Maria Agustin wrote:

> Hi Michael,
>   Thank you for your prompt response.
>   The thermal space is a central walkway between the buildings with an over
> head shading.
>    
>   i need to know indicative temperature profile within 1.8 metre (vertical
> height) if it si possible to maintain a space temperauture of around 24C to
> 30C during 40C and control the condensation that may occur on the exposed
> surface.
>    
>   the idea is to cool the slab and hopefully achieve a stratification effect
> (displacement type)that is if we can somehow control the airmovement...
>    
>   I have been using eQuest for a while now and learned using it the hardway, I
> did the training for energy plus in sydney sometime ago...
>   I am keen to start using energy plus, however i want to get a grip on the
> software the proper way...
>   I was hoping if you can guide me through... 
>    
>   regards
>   F 
> 
> "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
>           I am not sure where to start. Please give some more information
> about what you 
> need to model. If this thermal zone is open to the outdoors, what is the 
> control variable? This is just an open slab - no walls, no roof, no shading?
> 
> Mike
> 
> On 21 Jul 2006 at 20:08, Maria Agustin wrote:
> 
> > I would like to model an open sky walk way using a slab cooling. The area
> is
> > arounf 200meters in lenght and 60 meters wide. CAn anyone assist me to
> start
> > cracking the simulation.
> 
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support 
> EnergyPlus-Support@xxxxxxxx
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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