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RE: [EnergyPlus_Support] Re: DesignBuilder to EnergyPlus errors

Any model that would put the zone air temps over 50C is likely to have numerical problems.  

 

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of anarui.oliveira
Sent: Monday, January 21, 2008 10:01 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: DesignBuilder to EnergyPlus errors

 

Thanks (I looked it up), but I really couldn't get around that 
problem; if it is a problem with the stability of the finite 
difference algorithm, is there something I can do to try to try and 
overcome this issue?

I uploaded the .dsb and corresponding .idf file on the Problem 
Submittal area.
The problem (I think) arises in the 2 side blocks with large windows 
(due to the large and opposing windows, I suppose; but in some 
trials, if I only insert the window on the East side, for instance, 
the Zone Mean Air Temperatures and Radiant Temperatures do not go 
over 40-45ºC... and no instability arises...)

All ideas are wellcomed.

Regards,
Ana.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx <mailto:EnergyPlus_Support%40yahoogroups.com> , "Andy Tindale" <andy@...> 
wrote:
>
> Hi Ana,
> 
> The errors you mention are probably not related. "Could not 
triangulate
> surface" errors are nothing to worry about - just a problem 
generating DXF
> output for some polygons and not affecting results. "Temperature 
out of
> bounds" errors are of course a problem and this is what is 
preventing
> simulation completing. You can find some background info on these 
errors and
> warnings at:
> 
> http://www.designbuilder.co.uk/programhelp/energyplus_errors.htm <http://www.designbuilder.co.uk/programhelp/energyplus_errors.htm> 
> 
> You could send the dsb file to us at DB or upload the idf file to 
EnergyPlus
> support.
> 
> Andy
> DesignBuilder Software
> 
> -----Original Message-----
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx <mailto:EnergyPlus_Support%40yahoogroups.com> 
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx <mailto:EnergyPlus_Support%40yahoogroups.com> ]On Behalf Of 
anarui.oliveira
> Sent: 21 January 2008 10:15
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx <mailto:EnergyPlus_Support%40yahoogroups.com> 
> Subject: [EnergyPlus_Support] DesignBuilder to EnergyPlus errors
> 
> 
> Hi all.
> 
> I tried to create a somewhat complex building geometry by putting
> together more than one DesignBuilder block (I put them together 
using
> Snap Points, so they should fit exactly), but when I export this
> geometry to EnergyPlus I get several erros like the following:
> 
> ** Warning ** DXFOut: Could not triangulate surface="W_10631_3_0_1",
> type="Wall", check surface vertex order(entry)
> 
> for this and several other surfaces, and then a severe error:
> 
> ** Severe ** Temperature out of bounds (522.13) for
> surface=W_10631_2_0_0
> ** ~~~ ** in Zone=10631
> ** ~~~ ** During Warmup, Occurrence info=COVILHA PRT INETI
> DATA WMO#=085360, 01/20 10:00 - 10:02
> 
> that stops the simulation.
> I'm not sure if the 2 errors are related?
> 
> I already excluded the obvious Regular-R issues (all materials are
> defined as detailed, with proper density and heat storage).
> 
> Can anyone help me figure out reasons for this errors and ways to
> solve it?
> 
> Thanks,
> Ana Rui.
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov <http://www.energyplus.gov> 
> 
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/ <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
>

 



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