Re: [EnergyPlus_Support] Re: Help!! - Estimating Extraction Zone Air Temperature

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

1.  You must list the ZONE EXHAUST FAN in the ZONE EQUIPMENT LIST.  You do not 
need a PURCHASED AIR object.

2.  If I am following the input file correctly, there appears to be interzone 
heat transfer surfaces between the extraction zones and the MIXING source 
zones.  This will have some impact on the heating load of the adjacent zones.  
But I suspect the problem here is the difference in the "ON/OFF" schedule 
object.  In one file, the schedule is zero until 7:00, but in the other file, 
it is zero until 8:00.

Mike
  

On 14 Dec 2007 at 19:20, brandao_nuno wrote:

> Dear Mike,
> 
> I have two more questions: 
> 
> 1.I chose to model the EXHAUST FAN, but after
> simulating, i obtained the following warning:
> 
> ** Warning ** The following lines are "Orphan Objects". These objects
> are in the idf
> ** ~~~ ** file but are never obtained by the simulation and
> therefore are NOT used.
> ** ~~~ ** See InputOutputReference document for more details.
> ************* Object=ZONE EXHAUST FAN=VE WC CRIANÇAS
> 
> I couldn´t obtain the "System Node Temp".
> I believe that in order to model the ZONE EXHAUST FAN, i have to
> specify some equipment which "tells" to the exhaust fan in the
> extraction zones, that air is entering the zone, even if this outside
> air, is specified in the INFILTRATION object(or do i have to specify
> it as outside air in the PURCHASED AIR object?). Does that means i
> have to introduce a PURCHASED AIR object (avoing any HVAC equipment)
> to connect nodes,even if the zone is not controlled?
> 
> 2.I simulated the two cases (with and without MIXING). In both of
> them, i kept the INFILTRATION objects. The resulting heating load for
> the four heated zones in the two cases are diferent, being higher in
> the mixing case. I expected only an extraction zone air temperature
> modification but not in the other zones heating load. Why this is
> happening? 
> 
> I uploaded the two files, so that you can have a look at it.
> 
> Thank you very much for your help
> Regards
> Nuno Brandão
> 
> 
> 
> 
> 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.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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