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Re: [EnergyPlus_Support] Problem with outside air nodes

Each outside air inlet node must be unique.  Why?  Because the outside 
controller, or in this case, the window AC unit, sets the mass flow rate on the 
outside air inlet node.  Then the mixer component, which is passive, takes the 
mass flow present on the outside air inlet node and mixes it with the flow from 
the return air node.  HVAC nodes in EnergyPlus are single point inlets or 
outlets to a piece of equipment.

Mike


On 27 Feb 2006 at 15:47, tonybaxterhevacomp wrote:

> Hello,
> 
> I am using room a/c packaged units with outside air mixers, fans, DX 
> heat and cool coils and electric heaters.
> 
> If I use a common outside air node (NOUTSIDE) for all the room a/c 
> units and the outside air mixers, I get lots of Warning and Severe 
> messages (see below).  If I use a different outside air node for each 
> room unit (eg NOUTSIDE1, NOUTSIDE2 etc), then I get no errors.  
> 
> Why cant I use a common outside air node?
> 
> Any help would be useful
> 
> Tony Baxter
> 
> 
> Warning messages ----------------------------------------
> 
> ** Warning ** Node used as an inlet more than once: NOUTSIDE
>    **   ~~~   **   Used by     : PACKAGEDTERMINAL:HEATPUMP:AIRTOAIR, 
> name=W:1
>    **   ~~~   **   as inlet for: UNDEFINED, name=WM:1
>    **   ~~~   **   and  by     : PACKAGEDTERMINAL:HEATPUMP:AIRTOAIR, 
> name=W:10
>    **   ~~~   **   as inlet for: UNDEFINED, name=WM:10
> 
> 
>  ** Severe  ** Error in Node="NOUTSIDE", The same node appears as a 
> non-parent Inlet node more than once.
>    **   ~~~   ** Reference Object=OUTSIDE AIR MIXER, Name=WM:1
>    **   ~~~   ** Reference Object=OUTSIDE AIR MIXER, Name=WM:10
> 
> 
> 
> 
> 
> 
> 
> 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.
>  
> 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.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the "search" button.
 
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