Re: [EnergyPlus_Support] Exhaust from unconditioned space

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

The simplest approach would be to combine the bathroom space into the same 
thermal zone as the adjacent space.  

If you need to model the bathroom as a separate thermal zone, then what you 
suggest is the best approach.  For the bathroom zone, use a CONTROLLED ZONE 
EQUIP CONFIGURATION object to define a zone node and an exhaust node and list 
the exhaust fan and the only piece of equipment in the ZONE EQUIPMENT LIST.  
Note that EnergyPlus has no way to do an air balance on this, so the simple 
zone with exhaust fan will see no impact from the exhaust fan operation other 
than electric power consumption.  

The MIXING object will impact the bathroom zone by providing air from the 
adjacent zone.  But MIXING has no impact on its source zone, the user must 
allow for this by adding INFILTRATION to the source zone or by supplying 
outside air in the air loop which serves the source zone.  

If you are modelling heat recovery or anything else where the return air flow 
rate is important, then you will also need an exhaust fan in the adjacent zone 
(with zero power consumption) to reduce the return air flow from that zone.  

Mike

On 25 May 2006 at 20:17, aboyemeplus wrote:

> Hi,
> 
> I am trying to simulate a "semi open" system where air is extracted 
> from a bathroom that has no direct connection with the primary air 
> loop.
> My first instinct was to use the "Zone Exhaust Fan" object between the 
> subject zone and an outside node, while making up the extracted volume 
> of air using the "Mixing" object between the unconditioned bathroom 
> and an adjacent zone. 
> How do I define a Node representing the bathroom space (inlet to the 
> exhaust fan)? Is there such thing as an "open-loop" air system in E-
> Plus?   
> 
> Thank you for your support.
> 
> Merid 
> 
> 
> 
> 
> 
> 
> 
> 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





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