Re: [EnergyPlus_Support] Autosizing and general E+ procedure

["Michael J. Witte" <mjwitte@xxxxxxxx>]

I am surprised that autosizing would add significantly to run time.  Sizing 
performs a loads-only (purchased air simulation) for each DesignDay, then calls 
the systems once-through to size components.  

All of the computed sizes are reported in the eio output file and once these 
are determined, they are fixed for the entire simulation - nothing is changing 
over the course of the year.  

The procedure for using hard sizes would be to take the values reported in the 
eio ouput component sizing reports and copy/paste them into the idf file, 
replacing each instance of "autosize".  I doubt that you will find much 
difference in run-time between the autosized and hard-sized versions of the 
input, but if you do, please send me the input files for further investigation.

Mike


On 20 Apr 2007 at 15:24, maenebraska wrote:

> I understand that it may not be necessary to remove the autosizing 
> parameters; however, the run time is too excessive when using the 
> system, plant, and zone sizing in the run parameters.  Is there a 
> reccommended procedure for implementing values in place of the 
> autosizing numbers that will allow me to run the model without these 
> run control features active?  It seems that I should be able to "size" 
> the plant once based off of typical equipment parameters for a 
> building of some cooling load and keep those parameters for each day 
> of the year.  
> Is there any critical limiting factors that would keep me from setting 
> the coil and cooling tower characteristics constant throughout the 
> simulation year?
> 
> Thank you in advance?
> 
> Dan
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
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> http://groups.yahoo.com/group/EnergyPlus_Support/
> 
> Attachments are not allowed -- please post any files to the appropriate folder
> in the Files area of the Support Web Site.
> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the
> Documentation link and press the "search" button.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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