Re: [EnergyPlus_Support] simple ventilation COMIS

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

Simple VENTILATION assumes that an equal amount of air leaves the zone via an 
unspecified path.  You are correct that you cannot mix COMIS and simple 
VENTILATION in the same run.  These are the only two options that you have 
available in EnergyPlus.  My understanding is that both of these will give you 
a continuously varying flow rate as the driving pressure differences change, so 
these models are not going to accomplish your task.  If you have a way of 
predicting the flows in an outside program or spreadsheet, then you could use 
simple VENTILATION with a complicated schedule to drive the volume on an hourly 
(or less) basis throughout the year.

Mike



On 1 Mar 2004, at 21:36, Mohit Mehta wrote:

> 
> i am not sure if i am being able to express these questions clearly, but i'll
> try.
> 
> if i specify X(m3/s) - Design Volume Flow Rate of outside air into the zone...
> how does it account for this air leaving the zone i.e. from where? 
> 
> now, if i specify an opening (COMIS Surface Data) at the top of the tall zone as
> 'outlet' from where this air can leave... then it overrides the ventilation
> control at zone level in COMIS Zone Data and simple VENTILATION.
> 
> these two cannot be mixed - right?
> 
> what i am trying to do is - set the volume of outside air flowing in through
> these vents at different heights on the facade according to a certain pressure
> flow equation (not temp, size of opening, or any enthalpic controls) i.e. for
> Y(Pa) of pressure difference across the vent it allows a certain volume of air
> through it. partially controlled by natural forces (inside and outside) but at
> the same time CONSTANT over a wide range of driving pressure differences. once i
> have established this, i'd like to control it to a time of day schedule, for
> night vent, etc.
> 
> does EnergyPlus support this pressure-flow model? if yes - then where & how can
> i enter this relation? should it be in COMIS Surface Data...?
> 
> hope i've been able to put into words clearly!
> 
> thanks.
> 
> ~mohit
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> ---------------------------------
> Do you Yahoo!?
> Yahoo! Search - Find what you?re looking for faster.
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> 
> 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 not allowed -- please post any files to the appropriate folder
> in the Files are of the Support Web Site.
> 
> 
> 
> 
>  -- please post any files to the appropriate folder in the Files are of the
>  Support Web Site.
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
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 not allowed -- please post any files to the appropriate folder in the Files are of the Support Web Site.




 -- please post any files to the appropriate folder in the Files are of the Support Web Site.




 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
     http://groups.yahoo.com/group/EnergyPlus_Support/

<*> To unsubscribe from this group, send an email to:
     EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
     http://docs.yahoo.com/info/terms/