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[EnergyPlus_Support] Re: Energy Plus simulation run

Thanks a lot, Jim

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Jim Dirkes <jim@...> wrote:
>
> Harshul,
> In addition to Jean's good suggestion, here are some of my thoughts:
> 
> 
> o   You might also find that a large or complex model takes 10-20 minutes or longer to run just DesignDays!  If that's the case, consider making a much smaller "dummy" file with enough zones for testing.  This smaller file should run a lot faster and enable faster debugging.
> 
> §  The "dummy" file must follow all of the normal requirements, including correct zone names.
> 
> §  Certain multi-zone systems will need "doctoring " to get the zone / system air balance in line
> 
> §  If you are autosizing anything, you may find that, for example, the autosized supply air flow is less than the specified exhaust air flow, causing a system to run at 100% OA continuously.  (Supply air flow is small because your "dummy" file represents a smaller building with less load.)
> 
> o   These might also be helpful (but are not tested yet) for models that take a long time to run, even when using the above suggestions:
> 
> §  Set Building, Solar Distribution to "MinimalShadowing"
> 
> §  Set ShadowCalculation, Calculation Frequency to a larger value than default (say, 30 days)
> 
> §  Set Timestep to 2 (maybe even 1.  Accuracy is reduced, but this should help for speed until you are confident that all problems are resolved.)
> 
> §  Set ConvergenceLimits, Minimum System Timestep to a larger value (say, 15 minutes.  Same caution as for timestep above)
> 
> 
> James V Dirkes II, PE, BEMP, LEED AP
> www.buildingperformanceteam.com<http://www.buildingperformanceteam.com/>
> Energy Analysis, Commissioning & Training Services
> 1631 Acacia Drive, Grand Rapids, MI 49504 USA
> 616 450 8653
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of harshul
> Sent: Tuesday, April 09, 2013 9:22 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Energy Plus simulation run
> 
> 
> 
> Hi
> 
> My IDF file is 1.5 mb and it takes half an hour to run the simulation? Is there any technique to make it fast?
> 
> Thanks
>




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