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

Andy,
I did include radiant/baseboard heating system in the model. No natural ventilation, I am now trying to change the heating equipment to water convector and see if there is any difference for the simulation time.

Thanks.

Ke

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Andy Tindale <andy.tindale@...> wrote:
>
> 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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------------------------------------

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