RE: [EnergyPlus_Support] Re: High Temperatures in Vented Cavity

["Griffith, Brent" <brent_griffith@xxxxxxxx>]

OK, I looked at your file.  Your input file doesn't have any serious
problems and the program should be working better for this case.  We'll
be filing this as a bug (change request).  

 

But the problem is that you have only "Regular-R" materials in the
construction underneath the exterior cavity.  When I change your file to
have a proper construction, the exterior cavity model behaves as one
would expect.  Constructions should have some "Regular" materials or
else there is no mass (and no heat capacity) in the surface.  This can
lead to thermal instability in some cases (eg. "temperature out of
bounds" error); I think you found a new one.  Until we can address this
in the next release of the program, when using the advanced surface
model for exterior cavity you should also use full descriptions of the
construction's materials.   

 

Brent 

EnergyPlus Development Team

 

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of bbuenounzeta
Sent: Monday, December 10, 2007 12:52 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: High Temperatures in Vented Cavity

 

I have simulated the case with the 2.1 EnergyPlus and it performs in 
the same way.

Bruno

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx
<mailto:EnergyPlus_Support%40yahoogroups.com> , Linda Lawrie <linda@...>

wrote:
>
> This was one of the items that was addressed in the 2.1 release:
> 
> You should upgrade and see if this is still an issue.
> 
> Linda
> 
> EnergyPlus WebSite: http://www.energyplus.gov
<http://www.energyplus.gov> 
> Owner: EnergyPlus_Support list
> Member: EnergyPlus Development Team
> 
> 
> 
> [Non-text portions of this message have been removed]
>

 



[Non-text portions of this message have been removed]



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

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/