Re: [EnergyPlus_Support] question about return air condition

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

Sorry it took me so long to get back to this.  The difference in conditions is 
caused by the plenum.  Report the conditions at "Z_single return air outlet" at 
the "detailed" reporting frequency.  The conditions on this node match the zone 
conditions, lagged by one system time step.

Mike


On 27 Oct 2004, at 16:21, Chaoqin Zhai wrote:

> 
> Mike,
> 
> Thanks for your response. But I do not have any lights and window air flow
> specified in the input file. I still got the return air condition different from
> the indoor condition.
> 
> The input file, named as CAV_NoDegradation.idf could be found in the file 
> area.
> 
> 
> Thanks again,
> Chaoqin
> 
> 
> --On Wednesday, October 27, 2004 1:40 PM -0500 "Michael J. Witte" 
> <mjwitte@xxxxxxxx> wrote:
> 
> > The return air temperature is the zone node temperature plus any "Return
> > Air  Fraction" heat gain from LIGHTS and any impact from air flow windows
> > (WindowGapAirflowControl, Airflow Destination=ReturnAir).  The return air
> > humidity ratio is the same as the zone node humidity ratio.
> >
> > Mike
> >
> >
> > On 27 Oct 2004, at 5:31, zhaicq98 wrote:
> >
> >>
> >>
> >> Hi,
> >>
> >> Can anyone tell me how the return air condition is calculated? As I
> >> look at the output from my simulation, it is different from the
> >> indoor air condition. I have a supply fan but no exhaust fan in the
> >> system.
> >>
> >> Thanks!
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> 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.
> >>
> >> 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 area of the Support Web Site.
> >
> >
> >
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> 
> 
> 
> 
> 
> 
> 
> 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.
> 
> Yahoo! Groups Links
> 
> 
> 
> 
> 
> 
> 
> 
> 



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




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