Re: [EnergyPlus_Support] Controlling Air Flow rate through HVAC system

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

This is not easy.  System airflow is governed primarily by the flow requests of 
the terminal units.  To accomplish your goal, the easiest approach would 
probably be to use the DIRECT AIR terminal unit with a VAV supply fan.  DIRECT 
AIR currently has a fixed flow rate, but I expect it would be rather easy to 
modify it to allow a schedule multiplier on the flow rate.  If you implement 
this change, it might be useful to add in to the release version.

Where did you find a schedule for the minimum air flow rate?

Beware of version 1.2.2.  Bugs have been fixed since that was release.  Review 
the Addressed_Issues-V1-2-3-031.htm list to make sure you are not tripping over 
any of those issues.

Mike


On 15 Jan 2006 at 2:57, zorba2pi wrote:

> I am working on IEA Annex #46 at Oklahoma State and we are needing to
> control the air flow rate through the HVAC system on a schedule.  I am
> been trying to figure out a way of accomplishing this but so far the
> only I have been able to find is a schedule to turn the system on and
> off and a schedule for the minimum air flow rate.
> 
> I was able to modify the source code to allow the fan power to be
> calculated off a schedule, but this "back door" approach will not work
> for everything I need to accomplish?
> 
> I don't mind doing a simple modification to the source code, but I
> can't even find where the system flow rate is determined to begin with.
> 
> Any Ideas?
> 
> Also, we are using Version 1.2.2 for this case
> 
> Thank you,
> Barry Wilson
> 
> 
> 
> 
> 
> 
> The primary EnergyPlus web site is found at:
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> 
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> 
> Attachments are not allowed -- please post any files to the appropriate folder
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> 
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf 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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