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

["Ke Xu" <xukevin24@xxxxxxxxx>]

Pedro, Andy,
I did find the natural ventilation option in DesignBuilder is accidently turned on somehow, even though I didn't mean to. Thanks for your advise, I am now updating the model and giving it a run.

Thanks again.

Ke

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