[EnergyPlus_Support] Re: Model too big and too complicated? Part 1 - PC Performances

["jipp06" <jippnojunk@xxxxxxxxx>]

I totally agree. This is what I do, always.. :)

but I guess that question is "can the same model (same garbage in) give different results(garbage out)? Especially if that IDF has crashed in the past. Maybe the various "convergence" can converge differently in some instances.
Otherwise my occasionnal crashes (for the same IDF) would be a matter of PC resources.

:-)

JP Beaulieu.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "James V Dirkes II, PE" <jim@...> wrote:
>
> Amen!  Test your results .. Always.
> 
>  
> 
> The Building Performance Team
> James V. Dirkes II, P.E., LEED AP, BEMP
> 1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653
> 
>  
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Michael Grant
> Sent: Friday, May 06, 2011 10:57 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: RE: [EnergyPlus_Support] Model too big and too complicated? Part 1
> - PC Performances
> 
>  
> 
>   
> 
> I'm not very experienced with E+, but I can answer one of your question
> 
>  
> 
> "#2 - Can I trust the results of that successfull run (if it has crashed in
> the past). I suspect that if a run goes through without crashing, it
> probably means the results are good, right?"
> 
>  
> 
> The time tested thing about any calculation is: Garbage In = Garbage Out; so
> just because your run worked, doesn't mean that it's representative of your
> problem if your parameters are off.
> 
>  
> 
> Best of luck,
> 
>  
> 
> Michael Grant, MIT
> 
> Engineering | Systemair Inc.
> 
> (T) 1-506-743-9500 
> 
> michael.grant@...
> 
> http://www.systemair.net <http://www.systemair.net/> 
> 
>  
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of jipp06
> Sent: May-06-11 11:48 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Model too big and too complicated? Part 1 - PC
> Performances
> 
>  
> 
>   
> 
> Hello,
> 
> In the beginning, it's easy to add details that will make your model more
> complex later in the modeling process. I think I realised that. And it's
> kind of different for every software.
> 
> I put too many zones in my building... it's easy to do so in Openstudio.
> Don't you think?
> 
> Down the road, I think I am hitting the maximum performances of my PC.
> 
> 1st set of questions:
> #1 - If a model only occasionnaly CRASH, is it a good indication that the PC
> is not powerfull enough? last night a model crashed, I rebooted the PC to
> free RAM and it went through this time.
> MAYBE that the output file are too big: 1Gb .SQL file / 1,6Gb .ESO file...
> my PC has 2Gb RAM. I have a feeling PC may crash if I don't have at least
> that space in RAM, no?
> 
> #2 - Can I trust the results of that successfull run (if it has crashed in
> the past). I suspect that if a run goes through without crashing, it
> probably means the results are good, right? 
> 
> AND WHAT ABOUT YOU?
> #3 - What kind of PCs are you running. I consider upgrading. I have an Intel
> Core2 Duo CPU 2,2 GHz with 2Go RAM running on WIN Vista Ultimate.
> 
> #4 - Should I go for more CPUs or more RAM or Both... I understand from the
> old msgs on this forum that E+ is single core but there are plans to make it
> multi-core, right? I should upgrade to 4CPU's then. I think I'll go for a
> Intel Core i7-2600 Processor (3.40GHz, 1066MHz, 8MB) with 4Gb RAM
> 
> I have a second set of questions regarding my "complexe" model but I think
> I'll post them seperately in another msg. coming next!
>




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