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Re: [EnergyPlus_Support] Outside air problem

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Outside air problem
From: Petra Vaquero <pvaquero@xxxxxxxx>
Date: Fri, 31 Mar 2006 10:02:57 +0100
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Hi!

When the zone exhaust fan is runing the VAV system operate at constant 
volume supply, with the same flow of the exhaust. However, there is no 
control of temperature and relative humidity...

Is there a way to make this work?

Thanks
Petra

Michael J. Witte wrote:

> EnergyPlus sums all of the zone exhaust flows on the air loop and 
> adjust the
> outside air flow to be no less than this.  So the outside air flow 
> into the air
> loop will be this value, if the system supply flow is at least this 
> much. 
>
> However, EnergyPlus does not force system supply flow to increase to 
> meet an
> exhaust fan request.  Currently, if zone exhaust flow exceeds supply, the
> return flow is set to zero and the excess exhaust flow is ignored.  This
> presents a problem for your case.  When the exhaust fan is running, 
> does the
> VAV system operate at constant volume supply to this zone?  How is the 
> zone
> temperature controlled during these hours?
>
> Mike
>
>
> On 27 Mar 2006 at 10:38, Petra Vaquero wrote:
>
> > Hi!
> > My problem remains....
> > I have an extraction fan in the same zone where the VAV system is. From
> > 9 to 18 h the extraction flow is very high (0.667 m3/s - 100% outside
> > air). The VAV system never needs this flow. How can I assure that the
> > outside air will be this value?
> >
> > If it is not possible do you know another way to simulate this?
> >
> > Thanks
> > Petra
> >
> > Michael J. Witte wrote:
> >
> > > This should work.  In CONTROLLER:OUTSIDE AIR, specify the desired
> > > outside air
> > > flow rate for "minimum outside air flow rate".  This will be the
> > > outside air
> > > flow rate when the VAV system is at full flow.  If you want this to
> > > remain
> > > fixed, even when the VAV system flow is reduced, then set 
> MinimumLimit
> > > to FIXED
> > > MINIMUM.  One exception is if the VAV system flow is reduced below the
> > > specified "minimum outside air flow rate", the outside air flow will
> > > be reduced
> > > to provide 100% outside air at whatever the system flow rate is for
> > > that time.
> > >
> > > Mike
> > >
> > >
> > > On 24 Mar 2006 at 12:09, dust_broom wrote:
> > >
> > > > Hi!
> > > >
> > > > I am using the EnergyPlus to install a VAV system in a building with
> > > > several zones and I need to fix my outside air flow value. I 
> tried to
> > > > do
> > > > it in the Controller:Outside Air function but it doesn't work. The
> > > > outside air value is always the autosized one (In all other 
> components
> > > > the airflow values are autosized).
> > > > Does any one know how to solve my problem?
> > > >
> > > > Thanks
> > > > Petra
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > The primary EnergyPlus web site is found at:
> > > > http://www.energyplus.gov
> > > >
> > > > The group web site is:
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> > > >
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> > > >
> > > >
> > > >
> > > >
> > > >
> > >
> > >
> > > ========================================================
> > > Michael J. Witte, GARD Analytics, Inc.
> > > EnergyPlus Testing and Support    
> > > EnergyPlus-Support@xxxxxxxx
> > >
> > >
> > >
> > >
> > >
> > > The primary EnergyPlus web site is found at:
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> e+program&w2=Cad+software+program&w3=Medical+software+program&w4=Wedding+progr
> > 
> am+software&w5=Email+software+program&w6=Anti+virus+software+program&c=6&s=176
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> <http://groups.yahoo.com/gads?t=ms&k=Cad+software+program&w1=Backup+software+p 
> <http://groups.yahoo.com/gads?t=ms&k=Cad+software+program&w1=Backup+software+p>
> > 
> rogram&w2=Cad+software+program&w3=Medical+software+program&w4=Wedding+program+
> > 
> software&w5=Email+software+program&w6=Anti+virus+software+program&c=6&s=176&.s
> > ig=UpHLEMEo3UqDXPaxfQGgpQ>
> > > Medical software program
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> <http://groups.yahoo.com/gads?t=ms&k=Medical+software+program&w1=Backup+softwa 
> <http://groups.yahoo.com/gads?t=ms&k=Medical+software+program&w1=Backup+softwa>
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> re+program&w2=Cad+software+program&w3=Medical+software+program&w4=Wedding+prog
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> ram+software&w5=Email+software+program&w6=Anti+virus+software+program&c=6&s=17
> > 6&.sig=hIggffKyYt6Ha45Qp4vHNw>
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> > > Wedding program software
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> <http://groups.yahoo.com/gads?t=ms&k=Wedding+program+software&w1=Backup+softwa 
> <http://groups.yahoo.com/gads?t=ms&k=Wedding+program+software&w1=Backup+softwa>
> > 
> re+program&w2=Cad+software+program&w3=Medical+software+program&w4=Wedding+prog
> > 
> ram+software&w5=Email+software+program&w6=Anti+virus+software+program&c=6&s=17
> > 6&.sig=-fHbdfOtSsOofChL2KuS9g>
> > > Email software program
> > >
> > 
> <http://groups.yahoo.com/gads?t=ms&k=Email+software+program&w1=Backup+software 
> <http://groups.yahoo.com/gads?t=ms&k=Email+software+program&w1=Backup+software>
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> +program&w2=Cad+software+program&w3=Medical+software+program&w4=Wedding+progra
> > 
> m+software&w5=Email+software+program&w6=Anti+virus+software+program&c=6&s=176&
> > .sig=YkDt0mNOZPgKrXjtZWwLlA>
> > > Anti virus software program
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> <http://groups.yahoo.com/gads?t=ms&k=Anti+virus+software+program&w1=Backup+sof 
> <http://groups.yahoo.com/gads?t=ms&k=Anti+virus+software+program&w1=Backup+sof>
> > 
> tware+program&w2=Cad+software+program&w3=Medical+software+program&w4=Wedding+p
> > 
> rogram+software&w5=Email+software+program&w6=Anti+virus+software+program&c=6&s
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> > >
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> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
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> ========================================================
> 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 area of the Support Web Site.
>
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and 
> press the "search" button.
>
>
>
>
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> Wedding program software 
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> Cad software program 
> <http://groups.yahoo.com/gads?t=ms&k=Cad+software+program&w1=Wedding+program+software&w2=Cad+software+program&w3=Backup+software+program&w4=Medical+software+program&w5=Anti+virus+software+program&c=5&s=148&.sig=7KcNigW5hk7UibNLFEe6QQ> 
> Backup software program 
> <http://groups.yahoo.com/gads?t=ms&k=Backup+software+program&w1=Wedding+program+software&w2=Cad+software+program&w3=Backup+software+program&w4=Medical+software+program&w5=Anti+virus+software+program&c=5&s=148&.sig=s243PGK2aFb5OZ2VTWhaTA> 
>
> Medical software program 
> <http://groups.yahoo.com/gads?t=ms&k=Medical+software+program&w1=Wedding+program+software&w2=Cad+software+program&w3=Backup+software+program&w4=Medical+software+program&w5=Anti+virus+software+program&c=5&s=148&.sig=Mdr94aAELnTJMhMK0gcN4w> 
> Anti virus software program 
> <http://groups.yahoo.com/gads?t=ms&k=Anti+virus+software+program&w1=Wedding+program+software&w2=Cad+software+program&w3=Backup+software+program&w4=Medical+software+program&w5=Anti+virus+software+program&c=5&s=148&.sig=uEeALdRUSx-PEOxh2ZkAhA> 
>
>
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>



[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 area of the Support Web Site.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the "search" button.
 
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References:
- Re: [EnergyPlus_Support] Outside air problem
  - From: Michael J. Witte

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