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RE: [EnergyPlus_Support] A Problem regarding to Energy Plus Run Time

Hi Ke Xu,

I haven't had a chance to look at your files but does the model include any radiant heating or cooling systems? These can slow EnergyPlus down. Calculated natural ventilation? 

There is page in the DesignBuilder documentation which discusses some other causes of slow EnergyPlus simulations and approaches which have helped DesignBuilder users to speed up their simulations:

http://www.designbuilder.co.uk/helpv3/Content/Working_with_Large_Models.htm 

Regards,

Andy

Andy Tindale
DesignBuilder Software ltd
www.designbuilder.com
Tel: +44 (0)1453 755500


-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Ke Xu
Sent: 26 September 2011 22:53
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] A Problem regarding to Energy Plus Run Time

Hi,group members,
I have a problem with the simulation run time. I built up a building energy model with detailed HVAC systems using DesignBuilder v3 and convert it to an .idf file in order to simulate it in EnergyPlus.

Although the simulation could run without fatal error, it did take EnergyPlus quite a few days to finish a whole-year run. The building itself is fairly simple, primarily 1-story, about 28,700ft2 for total area,5 AHUs with chilled and hot water provided by a chiller and a boiler, respectively. Therefore, I am thinking about something inside of the model is not right, or some parts of the building model could be simplified.

Since it is my first time to build up such a detailed model, I felt that I don't have enough experience to figure out the problem. I uploaded the .idf as "0922detailedHVAC.zip " in the "Files" Zone and can anyone here help me find out the problems, or simplify the model and reduce the amount of calculation time?

Thanks.

Best Regards,

Ke Xu
 
Ph.D. Candidate, Graduate Assistant
 
Architectural Engineering Department
 
Penn State University



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------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

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 currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

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