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

Ke,

As mentioned by Pedro, you do have calculated natural ventilation switched on (as well as radiant heating). I understand that E+ v7 includes a big speed up for the airflow network so this shouldn't be so much of a problem in the future. It will be interesting to know after you have made your changes, which of these 2 (nat vent or radiant systems) has the biggest impact on simulation speed in your model.

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: 27 September 2011 04:51
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [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
> 
> 
> 
> ------------------------------------
> 
> Primary EnergyPlus support is found at:
> http://energyplus.helpserve.com or send a message to energyplus-support@...
> 
> 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
>




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

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





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

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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