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
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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