Re: [EnergyPlus_Support] Re: Trombe Wall delay solar radiation

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

The behavior of a Trombe wall will depend on how it communicates with the 
adjacent zone (interzone surface, windows if any, venting if any).  I am not 
sure from your question what you are seeing in the simulation and what you 
expect to see.  Are you comparing two simulations, one with the Trombe walls 
and one without?

Regarding SKY RADIANCE DISTRIBUTION, this was a user input in early versions of 
EnergyPlus.  A value of 1 was used to select the anisotropic sky model.  This 
is no longer an option in EnergyPlus, it always uses the anisotropic model.  

However, the sentence in the Engineering Reference was incorrect (p. 163, pdf 
p. 183):

"It is important to make sure the SKY RADIANCE DISTRIBUTION is set to 1 
(anisotropic) in the input file so that the majority of the solar flux is 
directed on the absorber surface and not just on the very small area of the 
Trombe zone floor."

This sentence should read:

"It is important to make sure the Solar Distribution field in the BUILDING 
object is set to FullInteriorAndExterior in the input file . . . "

Thank you for calling our attention to this so that we can fix the Engineering 
Reference for the next release.

Mike


On 9 Mar 2004, at 13:57, markus_gmeinder wrote:

> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "markus_gmeinder" 
> <markus_gmeinder@w...> wrote:
> > Hi, 
> > I think the Trombe Walls of my model only impact the temperature 
> > (decrease of approx. 2°C due to the thermal mass) but I thought 
> the 
> > Trombe Walls should also delay the temperature gradient in the 
> > adjacent zone.
> > Am I thinking wrong?
> > Thanks, 
> > Markus
> 
> PASSIVE TROMBE WALL: The Engineering Document says that the SKY 
> RADIANCE DISTRIBUTION is set to 1, but where can I find the value? 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files are of the Support Web Site.
> 
> 
> 
> 
>  -- please post any files to the appropriate folder in the Files are of the
>  Support Web Site.
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 



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



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