Re: [EnergyPlus_Support] EnergyPlus validation not working. Help

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

It's difficult to say what the problem might be.  Please upload the input file 
to the yahoo group files area in the Problem Submittals folder, or zip and e-
mail to energyplus-support@xxxxxxxx  

Regarding the CondFD solution, there are known problems with MATERIAL:REGULAR-
R.  First, change to an equivalent MATERIAL:REGULAR.  But we have encountered 
cases with no MATERIAL:REGULAR-R which do not produce results similar to the 
CTF results.  Some model match up well, and others do not.  This is still under 
investigation.

Mike


On 22 Jun 2007 at 2:39, taharvey2001 wrote:

> We've been getting results for E+ that we found suspicious,
> particularly with surface reflectivity, so we attempted to do a simple
> real world validation for Energyplus using an simple solar box (a
> thermal equivalent of the 3D rendering Cornell box). 
> 
> For the solar box, we used a solar box cooker with reflective panels.
> In EnergyPlus we made the same R10 2' square insulated box with a
> single clear glass window and used 100% reflective glazing for
> reflectors (since E+ doesn't let you specify specularity on normal
> materials - please change!).
> 
> We ran it on a clear sky solar date at the same tilt. Peak temp results:
> Real Solar Box: 350 F
> Hand calculated result: 360 F
> EnergyPlus: 210 F
> EnergyPlus (Finite Differencing): 117F
> 
> If i delete the reflectors, the solar gain changes only a tiny amount
> and the box temperatures don't change - obviously the reflection is
> not working properly - any ideas? (yes full interior/exterior with
> reflections is turned on)
> 
> The second question is what is up with Finite Differencing? 
> 
> 
> 
> 
> 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 area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


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





The primary EnergyPlus web site is found at:
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The group web site is:
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Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
 
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